The change of desertification and its driving mechanism in Mu-Us region in the past 20 years were analyzed by means of using Landsat images in three different periods and the data of meteorology. The results showed that in the past 20 years, the desertification in Mu-Us sandy land had decreased and the cover of vegetation had increased correspondingly. The change of NDVI in Mu-Us sandy land in the past 20 years demonstrated the results of vegetation coverage increasing.
The driving mechanism analysis showed that rainfall and temperature are the key factors of meteorology and the increasing of forest and farmland demonstrated the influence of man-made factor.
The Chinese government established the Natural Forest Conservation Program(NFCP) in 1998. As nationwide engineering, one of the most important tasks of NFCP was to mandatory conversion of marginal farmlands to forestland or grassland(reforestation or afforestation in farmlands) where topographical slope steepness was more than 25. In order to quantitatively study the grade of agriculture soil loss amount and soil erosion volume spatio-temporal variation, as well as to guide the process of the conversion of farmlands to forest in upstream of Yangtze Rivers, western of Sichuan province in China. The research analyzed how to calculate K, S, L, C and P factors of Universal Soil Loss Equation(USLE) on the base of considering terrain, climate and characters of agricultural soil. The methods can adapt to the variation terrain of the dry valley region in western Sichuan province. As believed the reforestation was a long-term engineering, we thought the planning of reforest farmlands is a temporal decision, which should be considered that where should be afforested at once and where should afforested in abeyance on the basis of grading soil loss amount and the others conditions of reforesting farmland. Grading agricultural soil loss amount would be beneficial to program a feasible plan in the conversation of farmlands to forest.
Natural Forest Conservation Program (NFCP) was established in China in 1998. As a nationwide engineering project, one of the most important tasks was to mandate conversion of marginal farmlands to forestland or grassland (reforestation or afforestation in farmlands) where topographical slope steepness was more than 25 degree. In order to quantitatively grade agriculture soil loss amount and assess spatio-temporal variation of soil erosion volume, as well as to guide the process of the conversion of farmlands to forest in upstream of Yangtze Rivers. The research analyzed how to calculate K, S, L, C and P factors of Universal Soil Loss Equation (USLE) on the base of considering terrain, climate and characters of agricultural soil using GIS technology. The methods can adapt to the variation terrain of the dry valley region in upstream of Yangtze Rivers. As believed the reforestation was a long-term engineering, the planning of
reforest farmlands should be a temporal decision process, which should be considered that where should be afforested at once and where should afforested in abeyance on the basis of grading soil loss amount and the others conditions of farmland. Grading agricultural soil loss amount would be beneficial to program a feasible plan in the conversation of farmlands to forest.
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