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| Preliminary Assessment of Forest Function on Soil and Water Conservation in Eastern Regions of Daxinganling Mountains |
| Yang Xiaohui,Wu Bo |
| Research Institute of Forestry, Chinese Academy of Forestry, 100091, Beijing, China |
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Abstract Forest function on soil and water conservation has drawn more attention from the Chinese publics. It is estimated that the soil erosion amount before and after cutting in the eastern forest area of Daxinganling Mountains using GIS and USLE, the results showed that annual soil erosion amount before cutting was 485万8658.55t, and that after cutting was 1亿4109万9989.4t which was equal to 29 times of that before cutting. Soil erosion modulus in all the forestry bureaus before cutting is lower than tolerant soil loss amount (200t/(km2·a)) in this region, while that after cutting was higher than tolerant soil loss amount; the maximum value was 3849.57t/(km2·a) in Huzhong Forestry Bureau where soil erosion was very severe. It is obvious that forest function on soil and water conservation in this region is very great. In the whole region, spatial pattern of soil erosion modulus before cutting coincides with that after cutting with decreasing trend from west to east, which is similar to the change of slope factor in this region, it can be concluded that vegetation coverage is main influencing factor for soil erosion, while slope gradient is main factor influencing spatial difference of soil erosion. Undoubtedly, this research will be helpful to formulate subsidy mechanism for ecological benefit and to determine priority of protection for ecological units in this region.
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Received: 06 April 2004
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