Impact of Biogeomorphological Processes of The Talus Slopes on Vegetation; Case Study Joghatai Mountains
Message:
Abstract:
Introduction
Talus slope is a part of a large geomorphological system composed of cliffs and talus components. cliff-talus system is one of the prospects of mountainous areas in most climates. Talus is formed by the accumulation of clastic chaotic particles downstream of rocky slopes. Talus often prevents seed growth and damaged or buried established plants. Vegetation rises with the reduced interference of larger rocks in the foot of the slopes. Traditionally, ecologists and geomorphologists have shown that one-sided relationship exist between plants and geomorphic domains. Essentially, vegetation and geomorphology studies have been done and developed in different ways. Ecologists often believe that plant distribution with all subdirectories are derived of the certain processes of talus slopes while geomorphologists focus on the dynamic range and rarely try to ascribe it to the vegetation patterns. In this study, we tried to explain and monitor the relationship and the interaction between plant species and the spatial patterns of morphodynamic in crystalline talus slopes on north face of Joghatai mountains. The study area consists debris cones to coordinate 57˚35ʹ 00ʺ north latitude and 36˚ 26ʹ 29ʺ eastern longitude mountains on the northern slopes of Joghatai Sabzevar.
Matherials and
Methods
This study is based on field research and library. Using the map of 1:50000 and Google Earth images we identified the location and range area then through field visiting we preparated required survey sample. To search for grading the slopes and soil stratum were determined on 10 plates with a meter in size. We attempted sampling of morphometric rocks by drilling. Using metric equipment for measuring the features of range and shrubs and to show morphometric relationship between the roots and the direction of growth, 20 trees were uprooted with caution. In each situation, the relationship between the size of the stones and the soil was registered with vegetation. Percent of vegetation was calculated with panel handling and sorting photos.
Discussion
Sumac is a shrub whose its height varies between less than 1 meter to 3 meters. In this study, the highest percentage of rock (63%) was related to the large rocks and pebbles that indicate mechanical weathering active in the region. Factors such as steep and slow chemical weathering, causing the soil at the top of this range was too low. With different sampling on 50 shrubs of sumac, we located 21 samples in pebbles fragment, coarse pebbles and 7 of the 12 samples and 10 average pebbles samples in the sand. Plant density was measured in the bottom of the range, due to the difference in the slope, granulometry particles and the volume of water to downstream. Vegetation cover and vegetation types in the talus are chaotic. 32% of the roots, were located at the top of the tree and the top of the range composed of coarse roots. 41% of the roots, in the downstream composed mostly of coarse and fine roots. 27 % of origins date back to the right and left, composed of the roots of medium or fine. Some trees were bent and clearly diagnosed in curved case with plant growth and angulation in the new year then last year. Some trees were so bent that the connection completely was cut off on the roots with soil and dry shrubs. Dry trees were naturally able to catch debris flow rate.
Conclusions
This study was conducted to investigate the relationship between biogeomorphology with plant processes on talus slopes. The samples were collected in Summer and Autumn. On the talus slopes there were two major vegetation types. Sumac is a shrub that has spread in 23 percent of range.Talus may damage plant or move plant downward. Gravel deposits can completely bury its roots and reproduce the trees, underbrush and layering. Roots had the tangible asymmetry. Some trees show good move mention debris with their shoot growth state. Along the talus impact on the growth and transmission of plants, live or dried trees were trying to prevent the fast moving debris.
Language:
Persian
Published:
Geographic Space, Volume:16 Issue: 54, 2016
Pages:
97 - 112
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