biomass

 Caraway is a plant from the umbelliferae, whose cultivation in arid and semi-arid regions has a high economic justification compared to other crops. The importance of using medicinal plants is the presence of effective substances in them, and the quality of medicinal plants is more important than agricultural plants. Iran is located in an arid and semi-arid region, and salinity is one of the environmental stresses that cause temporary or permanent damage. Salinity stress can change the amount of element absorption by the plant by changing the potential difference and affecting the absorption power of water and solutes by the roots. Nutrients necessary for the growth of agricultural plants are divided into two categories: high-consumption and low-consumption nutrients. By supplementing the consumption of low consumption nutrients, it is possible to improve the condition of plant growth in stressful conditions. Based on the studies conducted on agricultural plants, it has been determined that the use of micronutrient fertilizers in stressful situations can lead to an increase in the growth and yield of these plants, but this has not been well established in the case of medicinal plants, including caraway. . In this regard, this experiment was conducted to investigate the effect of salinity stress and the low consumption elements of manganese and iron on the morphological characteristics, yield, yield components and the amount of caraway essential oil. This experiment was carried out in the split plots basis of randomized complete blocks in Zahedan region of Iran. The experimental factors include salinity stress as the main factor in three levels (Irrigation with normal or control water (1.2 deciSiemens/m), irrigation with relatively salty water (3 deciSiemens/m) and irrigation with salty water (5 deciSiemens/m)) and low consumption elements as secondary factors in four levels (no fertilizer consumption, consumption of manganese, iron, manganese + iron) were. Plant height, number of sub-branches, number of umbrella per plant, number of seeds per umbrella, number of seeds per plant, weight of 1000 seeds, seed yield, biomass, harvest index, essential oil percentage and essential oil yield were measured and weighed. At the end, after ensuring the normality of the data, their analysis was done using SAS statistical software, comparison of averages was done by Duncan's multi-range test and at the probability level of 5%. Graphs and figures were also drawn by Excel software. The results showed that salinity had a significant effect at the probability level of one percent on plant height, number of umbrella per plant, number of seeds per umbrella, seed yield and biomass, and had a significant effect at the probability level of five percent on the number of branches per plant, number seeds per plant, weight of 1000 seeds and essential oil yield, but it had no effect on harvest index and essential oil percentage. According to the results, irrigation with relatively salty and salty water led to a decrease of 29.9 and 18.4 percent of grain yield, respectively, compared to irrigation with normal water. Nevertheless, the application of manganese and iron micronutrient fertilizers in the conditions of salinity stress to some extent led to the mitigation of the effects of salinity stress, so that the increase in grain yield due to the use of iron fertilizer in irrigation treatment with saline water was about 25.5% compared to the absence of fertilizer use. The highest yield of essential oil was achieved with 7.49 liters per hectare under favorable conditions. In this study, manganese and iron micronutrient fertilizers had a significant effect at the one percent probability level on plant height, number of umerellaper plant, seed yield and biomass, and a significant effect at the five percent probability level on the essential oil yield of caraway. Iron consumption with an average of 345.70 kg per hectare had more grain yield. Despite the lack of significant effect of micronutrient fertilizers on grain yield components, the application of these fertilizers increased them. Considering the increase in seed yield and the yield of caraway essential oil under conditions of application of manganese and iron, the use of these fertilizers in caraway cultivation is recommended. In this experiment, salinity stress had a significant effect on all the morphological traits, yield components, seed yield and essential oil yield of caraway, except for the traits of harvest index and percentage of essential oil, and led to their reduction. The negative effect of salinity stress on the weight of 1000 seeds, number of umbrella per plant, number of seeds per umbrella and number of seeds per plant can be considered the most important factor in reducing seed yield under these conditions. Based on the results, it can be concluded that manganese and iron and their combined use causes an increase in the morphological traits, seed yield and yield components and the yield of the essential oil in this medicinal plant. In general, considering the increase in seed yield and the yield of caraway essential oil under the conditions of application of manganese and iron, the use of these fertilizers in the cultivation of caraway can be justified.

treatments included Pendimethalin (Prowl CS 45%) With concentrations of 2.5, 3 and 3.5 L ha-1 After planting potato, Metribuzin (Sencor WP 70%), 750 g.ha-1 After planting potato and Pre weed emergence to Four leaf weed, Rimsulfuron (Rima DF25%), 100 g ha-1 Three or Five leaf weed, Paraquat (Gramaxon Sl 20%), 3 L ha-1 After planting potato and A maximum of 70 percent of Pre emergence potato, Sulfosulfuron (Apiros WG 75%) 30 g ha-1 Three or Five leaf weed, And control treatment is hand weeding. The results showed that the density and biomass of weeds were affected by the herbicide treatments So that weeds biomass the highest treatments show in Sulfosulfuron 30 g ha-1 and Paraquat 3 L ha-1 and lowest percentage biomass loss were for treatments of Rimsulfuron 100 g ha-1, Pendimethalin 2.5, 3 L ha-1 and Metribuzin 750 g ha-1. The Use of 30 g ha-1 Sulfosulfuron, decreased weed density and biomass of Johnson grass (Sorghum halepense) 100 percent controlled. In the case of field Bindweed (Convolvulus arvensis), all treatments except Pendimethalin 2.5, 3 L ha-1, were suitable in reducing the density and biomass of this weed for Red root pigweed (Amaranthus retroflexus) all treatments except Paraquat 3 L ha-1, were suitable. Results, also, showed that application 30 g ha-1 Sulfosulfuron and Pendimethalin 3.5 L ha-1, after weed free, increased total tuber yield by 89.34 and 84. 69 percent respectively.

In this study, the goal is; Find suitable statistical and experimental models for estimating ground carbon storage by combining spectral and radar data from Sentinel 1, 2. There are 150 random circular samples with an area of 10 acres and a total of 150 samples. With global coverage, all height classes were selected. Species of species type, the total height of trees, and diameter equal to the chest of trees with more than 7.5 cm were recorded in each sample plot. After that, the amount of biomass at the surface of the sample parts was calculated based on the FAO global model and the amount of carbon storage on the ground by applying a coefficient. Radar and spectral images were subjected to various preprocessing operations and necessary processing. Then, the numerical values corresponding to the ground sample plots were extracted from the spectral bands and considered as independent variables. Modeling was performed by non-parametric methods of RF, SVM, kNN, and parametric methods of multiple linear regressions. The results showed that the average ground biomass was 469.07 tons per hectare and carbon storage was 234.53 tons per hectare. Also, the highest correlation was obtained between the main and artificial bands with the two characteristics related to the near-infrared band. The results of modeling validation showed the combination of optical and radar data of Sentinel 1, 2 satellites with biomass and surface carbon storage; Random forest method with the RMSE%, and percentage of bias. The studied characteristics (32.79, -2.24) and (30.79 and 0.01), respectively, have had a better performance in modeling. In general, the results obtained from the validation showed that in estimating the two characteristics the RF method showed better results if the Sentinel 1, 2 data were combined, and in contrast to the SVM.

Today's energy-intensive human life, caused investigating different sources of energy supply. It is extremely important to use renewable energy sources to generate scattered electricity, due to the high cost of electricity transmission lines, and also necessity of pollution reduction and environmental protection. One of the sustainable energy resources is biomass, which cow dung is a subset of it. In this study, the number of the cows in the Mashhad County were estimated. Also, the electricity consumption in agricultural sector of Mashhad County was estimated for the year 2035. Finally, according to the available energy from cow dung, the possible energy supply was calculated for agricultural sector of the region. Electricity production from cow dung and energy needed in agricultural sector for Mashhad was estimated to be 6797 and 12342019 MWh, in 2035, respectively. Therefore, the amount of energy from cow dung is less than 0.1 percent of the energy needed. This source of energy (cow dung) is recommended for producing thermal use or scattered electricity. The use of other sources of biomass could be a solution to provide some part of energy demand from clean resources.

Biomasses are one of the major sources of renewable energy and suitable alternatives to fossil fuels. An application for biomass energy is fuel pellets which are made from agricultural waste, plant residues and manure, are compacted and contain higher energy per unit of volume. In this research, different proportions of pellets were prepared from two types of rice straw biomass and sugarcane bagasse (25%, 50%, 75% and 100%) and their combination with natural binders (frankincense, Arabic gum, eremurus) at three levels (5%, 10%, 15%). The effect of these variables were investigated on the density, fracture resistance, stability and calorific value of the manufactured fuel pellets. The comparison of results means showed that the optimum proportion for fuel pellet production is a combination of 75% sugarcane bagasse and 25% rice straw, which combined with the frankincense natural binder. This proportion has the highest failure strength, durability, and heating value at 15% binder level.

Providing sustainable sources of energy, global warming, and maintaining soil health are the main challenges of the 21st century. Biochar has great potential in addressing these global issues and can be effective in achieving sustainable development goals. Biochar obtained from waste biomass (plant residues, urban and rural wastes) is a catalyst for the anaerobic digestion process and increases bioenergy production due to its mineral content and buffering capacity. This article is the result of reviewing valid online papers from Google Scholar, Science Direct, Research Gate, Elsevier, and Springer. The Results showed high advantages of biochar for using in the production of renewable energy and reducing greenhouse gases. Biochar potentially increases methane and hydrogen productions in anaerobic digestion and is efficient in on-site biogas enrichment, leading to biomethane production with a purity of more than 90%. On the other hand, it can be a cheap and potential replacement for the electrode of microbial fuel cells and reduce the cost of ion-based batteries. The application of biochar in the agricultural ecosystem increases carbon sequestration in soil and reduces methane and nitrogen oxide emission. The structural characteristics such as high surface area, optimal pore distribution, surface reactivity, hydrophobicity, and many functional groups make this adsorbent a suitable choice for the remediation of heavy metals from aqueous solutions. The potential of sustainable use of biochar in biological energy production (biogas and biohydrogen), reduction of greenhouse gases, carbon sequestration and soil health, and wastewater treatment along with its future challenges and perspectives is necessary with the Nexus approach of energy, water, and agriculture.

Trees are one of the most important and largest carbon reservoirs in forest ecosystems and measuring and estimating carbon reserves in different organs of trees is one of the most important research topics for ecologists. The aim of this study was to estimate the monetary value of aboveground carbon sequestration of tree species in Chitgar forest park. Based on a systematic random sampling method, a total of 100 circular sample plots were collected in a grid with dimensions of 100×100 m. In each plot, species type, diameter at the breast height, and the height of trees were measured. Allometric equations were used to estimate the carbon sequestration of different tree species. The analysis of variance and Duncan tests were used to compare carbon sequestration between different species. The results showed that the mean carbon sequestration in Robinia pseudoacacia, Malus sp., Pinus taeda, Fraxinus sp. and Juniperus sp. were 4.58, 1.92, 58.31, 2.08 and 0.86 ton/ha, respectively. The results of the analysis of variance showed that there was a significant difference between the mean carbon sequestrations between different species. Besides, the results also showed that the above ground sequestered carbon was 67.76 tons per hectare and in the whole studied area with 800 hectares, the sequestered carbon was 54212 tons. The economic value of carbon sequestration in Chitgar forest park was calculated at 1.37 million EUR.

Increasing water use efficiency in order to more produce in the agriculture section has special importance. Therefore, simulation of plant growth stages and, consequently, prediction of product yield lead to better planning and more efficient management in the production process. The present study was conducted with the aim of predicting yield and sugarcane biomass at ratoon stage in the third year of planting, with AquaCrop model in Amir Kabir Agro-industry Co. with three levels of full irrigation or 100% water requirement (I1), 75% (I2) and 55% water requirement (I3) and three levels of 100% manure requirement of sugarcane plant to nitrogen fertilizer (F1), 80% (F2) and 60% (F3) with four replications in 2010-2011. For calibration of the model, the calibration values with the prediction of statistical error of R2 for yield and biomass for all levels of fertilization and irrigation were 0.97 and 0.96 respectively. In the validation stage, the yield of the product was simulated in different conditions of irrigation management, and it was compared with actual yield, and the correlation coefficients for the yield of the product and the biomass was estimated to be 0.91 and 0.81, respectively. The results showed that F2I1 has higher yield and biomass than other treatments and with the 20% reduction in fertilizer application, the desired yield could be achieved. This will reduce agricultural costs and, in the long run, will also eliminate the negative effects of excessive fertilizer use and, while increasing production, will be a strategic plan for achieving sustainable agricultural objectives.

Vegetation is one of the criteria indicating the production potential of the land. So that the quality and quantity of vegetation in each region is a criterion for determining its production potential. In this research, vegetation indices of Landsat 8 digital data were used to estimate vegetation cover and biomass in the protected area of the central Alborz in June 2016. To study the correlation between vegetation cover and biomass with satellite data, 27 samples were obtained randomly in the region. Linear regression was used to determine the relationship between cover percentage and biomass values with remotely sensed vegetation indices. The results showed that among selected vegetation indexes,  Enhanced vegetation index (EVI) and Visible atmospherically resistant index (VAR) had the highest correlation coefficient with vegetation percentage 0.53 and 0.52, respectively. Therefore, these vegetation indices are appropriate for estimating vegetation cover at a 5% significance level. And in calibration, the correlation coefficient for the wet weight of vegetation and the indices of Global environment monitoring index (GEMI), Simple ratio (VR) and Enhanced vegetation index (EVI) were 0.43, 0.41 and 0.41, respectively even though their estimations were unsuccessful in the validation stage. According to the results of this research, it is recommended that the indicators for the estimation of the quality and quantity of vegetation should be used in which the atmosphere and soil impacts are considered.

To investigate simultaneous effects of Thiobacillus bacteria, sulfur, and organic fertilizer treatments on chemical forms and quantity of phosphorus absorption by corn, an experiment was conducted based on completely randomized design using eight treatments and three replications in a greenhouse located in Hashtgerd, in 2014. Treatments included control, Thiobacillus, sulfur, organic fertilizer, and two ways and three ways combinations of these factors. Results showed  that the highest and lowest yield, root dry weight, root fresh weight, shoot weight, and phosphorus uptake were obtained in the Thiobacillus + sulfur +organic fertilizer treatment and control treatment (without any added Thiobacillus, sufur, and organic fertilizer), respectively. Thiobacillus + sulfur +organic fertilizer treatment caused significant change in inorganic and organic phosphorus elements and enhanced available phosphorus in soil, so that the highest available phosphorus was related to the treatment number eight with 16.22 mg/kg soil and this treatment showed four more mg of available phosphorus compared with control treatment. On the other hand, the Thiobacillus +sulfur treatment resulted in more reduction in mineral forms of phosphorus including dicalcium phosphate and apatite joint phosphorus compared with other treatments. The most organic and total phosphorus in soil was observed in sulfur + organic phosphorus and Thiobacillus + organic phosphorus treatment, respectively. Taken together, results of this study showed that using Thiobacillus bacteria along with sulfur and organic fertilizer would result in enhanced phosphorus uptake and improved phosphorus status in the plant, which would cause more reduction in chemical fertilizers in extensive scale.

In order to explore the effect of chemical and Nano bio-fertilizer on quality and quantity of sesame genotypes, an experiment was conducted in a completely randomized block design with three replications at Agricultural Research Institute of Zabol University in 2014-2015 growing season. Treatments included three sesame genotypes (Ardakan, Isfahan and Sistan landrace) as main plot and fertilizer type included 100% of recommended chemical fertilizer, 75% of recommended chemical fertilizer + 1.5 kg.ha-1 of nano bio-fertilizer, 50% of recommended chemical fertilizer + 1.5 kg.ha-1 of nano bio-fertilizer, 25% of recommended chemical fertilizer+ 1.5 kg.ha-1 of nano bio-fertilizer and 1.5 kg.ha-1 of nano bio-fertilizer as subplots. The results showed that using 100% of recommended chemical fertilizer caused significant increase in plant height, number of capsule per square meter, thousand seed weight, seed yield, and biomass. The highest of capsule number per square meter (2256 number) was obtained from Sistan landrace with the application of 100% of recommended chemical fertilizer. The number of capsule per square meter, number of seeds per capsule, thousand seed weight, seed yield, biomass, harvest index, chlorophyll index and protein percentage showed significant increase in Sistan landrace in comparison with the other genotypes. The results showed that the highest seed yield was obtained (1428.07 kg.h-1) from Sistan landrace and the highest oil percentage (41.7%) was obtained from Isfahan genotype. According to the results, it could be said that the 100 kg.ha-1 of potassium sulfate, ammonium phosphate and urea application can be beneficial in increasing yield and improving growth characteristics of sesame.

In order to evaluate the seed and essential oil yield and harvest index of cumin, a factorial experiment based on randomized complete blocks design was conducted with three replications, at the research farm of the faculty of agriculture of Urmia University in 2010. Treatments were four irrigation regimes (irrigation after 50, 100, 150 and 200 mm of evaporation from a class A pan) and different amounts of superabsorbent polymer (0, 60, 120, 180, 240 and 300 kg/ha). The highest biomass yield (3640 kg/ha), seed yield (1226 kg/ha) and essential oil (36.5 kg/ha) belonged to irrigation after 50 mm of evaporation and 60 kg/ha superabsorbent polymer application. Increasing in irrigation distances to 100, 150 and 200 mm of evaporation needs to 180 and 120 kg/ha polymer to produce maximum yield (biomass and seed), but they were 60 and 300 kg/ha polymer for essential oil yield and harvest index, respectively. The maximum harvest index of seed for irrigation after 100, 150 and 200 mm of evaporation belonged to 180 kg/ha superabsorbent treatment. Application of superabsorbent at irrigation after 50 mm of evaporation (non-stress condition) does not have efficiency for essential oil production compared with the control (without polymer in this irrigation). In conclusion, increasing irrigation intervals from 50 to 200 mm of evaporation from pan lead to reduce the yield (biomass, seed and essential oil), that application of superabsorbent polymer A200 compensate part of this reduction.

The effects of sowing date and plant density on yield and yield components of mung bean cv were studied in a split-plot experiment, based on a randomized complete block design in three replications, which was performed at the research farm of Islamic Azad University of Jiroft in 2010-2011. The main-plots were devoted to sowing date at four levels (June 29, July 6, July 12 and July 20) and the sub-plots were devoted to density at three levels (10, 20 and 30 plants m-2). Analysis of variance revealed that sowing date significantly influenced plant height at the 1% level of probability and the number of pods per plant, the number of grains per pod, grain yield and biomass at the 5% level of probability. The effect of plant density was significant on the number of pods per plant and biomass at the 5 and 1% probability levels, respectively. The interaction of sowing date and plant density was significant only for plant height and biomass yield. The highest grain yield (1001 kg ha-1) was obtained from July 6 and the lowest one (714.3 kg ha-1) from July 20. Although the effect of plant density was not statistically significant on grain yield, the highest grain yield (907.98 kg ha-1) was related to the density of 30 plants m-2. Considering the one-year results, the best sowing date can be regarded as to be July 6 with the density of 10 plants m-2 under the regional conditions of Jiroft.

Today, one of the most important challenges facing human societies is global warming and reduces biodiversity. For the present study, Elevation profile Veisar forests west of Mazandaran were selected. To calculate the biomass of tree and vegetation diversity in the forest, in a profile height (700 to 1,500 meters above sea level) was 9 floors and on each floor of 8 plots with the exception of 1500 meters above sea level with 5 floors and a total of 69 plots of 400 square meters plots (20 × 20 m) were taken All the trees in each plot, diameter at breast height of 7/5 cm of coverage and type of species identified and measured. The measurement data herbaceous plant cover, a micro-plot of 100 square meters (10 × 10 m) in the center of the plot on foot and herbal species of plant cover percentage were measured according to Braun-Blanquet method. The value of carbon sequestration by combining the relationship between size, density dry and carbon coefficient was calculated. After determining the levels defined by common measurements to determine the relationship between indicators of biological diversity (richness, evenness, diversity) and Carbon Analysis of variance was used. The findings showed that between the amounts of biomass amount of carbon stored in trees with no significant relationship between diversity indices in elevation. These results suggest that proper management of forest biomass for appropriate monitoring research in the area of biodiversity indices cannot be used as a means.

Climate change and global warming as a result of increase in the concentration of greenhouse gases is considered as one of the main challenges of sustainable development. Carbon sequestration by plant and soil is the easiest and the most practical strategy to reduce the concentration of atmospheric carbon. In the present research to investigate and compare the potential of carbon sequestration in two species included Atriplex canescens and Haloxylon spp, a part of a rehabilitated area by these two species within the area of Carbon Sequestration International Project, Hossein Abad Ghinab, Sarbisheh Township located in South Khorasan Province was selected as the study area. Plant Sampling was done from the aerial and terrestrial biomass parts of the two study plants separately (leaf, stem and root). Similarly in order to determine the amount of carbon sequestration in soil, soil sampling was carried out from two depths of 0-30 and 30-60 cm in the place of 10 profiles and different physical and chemical characteristics of soil were measured. The results of statistical analysis indicated that the amount of carbon sequestration in soil by Haloxylon spp and Atriplex canescens were 99.8 and 86.8 ton/ha respectively. Also based on the results, the amount of carbon sequestration in depth of 0-30 cm was more than depth of 30-60 cm in both stands. Furthermore the amount of soil carbon sequestration in depth of 0-30 cm by Haloxylon spp stand was more than Atriplex canescens. The results of analysis correlation between physical and chemical characteristics of soil and soil carbon sequestration showed that organic carbon, organic material, Phosphorus, potassium, electrical conductivity, bulk density and nitrogen, respectively, are the most important components influencing carbon sequestration in soil in Atriplex canescens stand. Similarly, Organic carbon, organic matter, bulk density, potassium and nitrogen, respectively, were the most important factors affect soil carbon sequestration in Haloxylon spp stand. Total carbon sequestration by Haloxylon spp and Atriplex canescens were estimated 364.32 and 107.64 kg/ha respectively. On the other hand, based on the results of estimation for the amount of carbon sequestration in plant organs which was done for each of the two study species, it was concluded that the portion of different organs of plants in carbon sequestration was different, so that the highest and the lowest amount of carbon sequestration were measured in the stem and leaves of both study species. Total Carbon dioxide removed from the atmosphere by Haloxylon spp and Atriplex canescens were 1337 & 395 kg per hectare, respectively. Regarding the total area of the study area (400 ha.) this amount was estimated 346400 kg per hectare during the 4 study years of this research.

The effect of seed Provenance on the rate of seed germination and some quantitative characteristics of Cappadocian Maple seedling were investigated in this study. To achieve this goal seeds from the two seed Provenances were collected from Pahne kola (250 m) and Lajym (900 m). These Seeds were planted in the form of a completely randomized block design in nursery in Mazandaran pulp and paper company. then, after eight months of planting, percent age of seed survival, diameter and height growth, leaf number, stem on root ratio and root, stem and leaf biomass were measured. The results showed that the two source parameters studied were %99 significantly different and seedlings of seeds from Lajym source showed more favorable conditions.

According to the role of tourism on various biodiversity indices including diversity, richness and evenness and its impression on biomass and the abundance of creatures living in the area especially earthworm, we have decided to do the present survey considering this issue in chaldare natural forest park for this purpose we divided the area into 3 different zones: low-tourism pressure, mean tourism pressure, and high tourism pressure. After identifying the zones under study we started vegetative sampling. In each zone we chose 5 samples with an area of 100m2 with square shape in square (10×10m) which was randomly and systematically selected then the diversity of wood and seedling species was investigated. In four corners of each piece of land we chose some Micro-plots in 2×2m as big as 4m2 to study the biodiversity of each woody species. Moreover to measure the earthworm biomass in the center of each Macro- plots, a small plot in 0.5× 0.5 m for the earthworm biomass was prepared and the humus weight in the area unit was assigned through harvesting some soils from the surface area. Collection of soil Macro phones was done manually. Then to remove the humus layer we had to do it in some holes as big as 25×50×50cm and then we analyzed them in Lab. The results showed that high-tourism pressure has significant effect on decreasing plant species also making less diversity, increasing evenness and less richness in vegetarian coating, however it didn’t have any effects on trees and seedlings diversity. for sure the reasons would be their ages, high survival, roots perseverance and being less sensitive to tourism pressure in addition to destructive factors. Moreover, the high-tourism pressure could cause ecosystem destruction, soil squashing and density. It didn’t statistically show any significant difference and didn’t have an effect on earthworm biomass.

Urban forest is quite significant in reducing negative effects of Civilization and preserving the ecological balance of urbon ecological system. With the goal of estimating carbon storage in the Ash affrostration, transect sampling of the region was conducted. Five samples of average diameter of each diameter class were selected. After determining the overall weight of different parts of a tree, to measure the dry weight as well as to determine the amount of biomass, different parts of that tree were transformed to a kiln. The quantity of ash was taken away from biomass and then the amount of organic sequestrated carbon was measured. To determine the physical and chemical characteristic of the soil, 12 samples were collected from 0-30 and 30-600 cm soil depths. Research results show that the amount of annual biomass and carbon storage was estimated respectively 526 and 464 Kilograms per hectare. The results of Duncan test showed that there was significant difference between the amounts of carbon storage in different diameter classes. Considering the characteristic of the soil, the percent of Nitrogen and organic carbon showed the maximal correlation with the amount of biomass.