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Shvoong Home>Science>Agronomy - Agriculture>Study on the Ecological Value of Soil Conservation of Vegetation in the Qinling-Daba Mountains Summary

Study on the Ecological Value of Soil Conservation of Vegetation in the Qinling-Daba Mountains

Article Summary   by:TsingHua     Original Author: Arid Zone Research
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The study area,Qinling-Daba Mountains(31°42′~34°45′N,105°46′~111°15′E) covers three morphologic units,i.e.,the Qinling Mountains,Hanjiang Valley-basin and Daba Mountains,its east-west length and south-north width are 400~500 km and 180~380 km respectively,and its total area is 8.71×10~5 km~2.In the study area the annual temperature,monthly temperatures in July and January and annual accumulated temperature ≥10 ℃ vary in ranges of 12~15 ℃,23.4~26.7 ℃,0~3.6 ℃ and 3 812~5 537.4 ℃ respectively;the annual precipitation varies in a range of 709.5~1 400 mm,the rainy season is from April to October,and the precipitation in rainy season occupies 75% of the annual one;and the biological resources are more than 6 000 species.In general,the Qinling-Daba Mountains is characterized the diversified floras,complicated ecological conditions,rich plant species,significant vertical zones,and complete and typical spectrum differentiation of vertical zones.Soil and water conservation and soil fertilization are the most important ecological services of continental ecosystems,which play a basic role in promoting regional agricultural sustainable development.
In this paper,the values of soil conservation and fertilization of vegetation in the Qinling-Daba Mountains are estimated by subtracting the erosion modulus of soil covered with vegetation from the erosion modulus of soil without vegetation coverage based on the equation of soil erosion and the vegetation indexes under GIS support.The results show that the total value of vegetation in controlling soil erosion in the Qinling-Daba Mountains is(4.23)×10~6 yuan RBM;the total value of vegetation in soil fertilization is 2.24×10~9 yuan,in which the values of N,P and K are 4.37×10~8 yuan,1.86×10~8 yuan and 1.62×10~9 yuan respectively;and the total value of vegetation in reducing filling-up is 1.45×10~7 yuan.The total ecological value of vegetation in controlling soil erosion in the Qinling-Daba Mountains is 2.26×10~9 yuan.
Published: March 30, 2006   
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