The effect of Tree covers on soil microbiological indices and CO2 emission
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Background And Objectives
Soil physical, chemical and biological properties can be considered as the most important features of soil quality indices related to land cover and also climate changes. Afforestation with native and non-native species were employed for rehabilitation of natural degraded lands. Usually due to the study of soil quality, some properties are regarded that are more sensitive to environmental changes. Soil biological and biochemical properties are the features that response to environmental changes and ecosystem management in the short term. Soil as the site bed is affected by selected species type. Regarding to species type and its effect on soil quality properties is as management algorithm that is due to quantity preserve and long term stability of afforested areas.
Materials And Methods
To aim studying the effect of different land covers (Robinia pseudoacacia, Fraxinus excelsior, Cupressus arizonica and Pinus elderica) on soil physical-chemical, microbiological and CO2 emission characters, the present research was regraded in the Chitgar park. Sampling was done from the organic (litter) and mineral (0-20cm) layers using of the randomly systematic method. Litter quality properties (carbon and nitrogen), soil bulk density, texture, water content, pH, organic carbon, total nitrogen, nitrate, ammonium, carbon microbial biomass, nitrogen microbial biomass, CO2 emission (and their fluxes in different temperature and moisture regime) measured in the laboratory.
Results
Results is indicating the afforested stands had significantly different effects on the whole of the physical-chemical properties of soil and litter (except carbon content). According to our findings, the highest amount of CO2 emission (1 mg CO2 m-2 d-1), microbial biomass of carbon (510.31mg kg-1) and nitrogen (0.13 mg kg-1) were belong to Robinia pseudoacacia stand. In addition, the maximum of CO2 emission was occurred in field capacity moisture regime and higher temperature.
Conclusion
The change of degraded land covers, afforestation with needle leaved and broad leaved species, improved the fertility indices, especially biological indices of soil quality in the study area. The highest amount of microbial respiration, microbial biomass of carbon and nitrogen were found under afforested site with broadleaved species and the least amount were detected in bare land. The results are indicated that the land use change and destroying of ecosystem plant covers is due to a severe reduction of mentioned indices in Chitgar region. So, land use change is a treat for soil health and quality in study area that must be considered in management of degraded natural ecosystem
Language:
Persian
Published:
Water and Soil Conservation, Volume:24 Issue: 4, 2017
Pages:
63 to 81
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