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| Study on the Land Desertification and Its Control in the Crop-grazing Crisscross Area of China: Taking Yanchi County in Ningxia Hui Autonomous Region as Example |
| Zhang Kebing1,Wang Jinglin2,Hou Ruiping1,Li Rui1,Yang Xiaohui3 |
| 1.Soil and Water Conservation College, Beijing Forestry University, 100083, Beijing, China;2.Yanchi Mechanical Farm of Forest in Ningxia Hui Autonomous Region, 751500, Yanchi, Ningxia, China;3.Research Institute of Forest, Chinese Academy of Forestry, 100091, Beijing, China |
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Abstract Based on historical data and by fixed sample plot observation with mathematical methods of Markov Chain and Fuzzy Pattern Recognition, desertification pattern, development and its trend in transition region from agricultural area to rangeland of Yanchi, Ningxia were studied. The results show that ( 1 ) the annual increment rate of desertification in Yanchi in past 40 years was 4.03% . (2)the main causes of desertification in Yanchi are human irrational activities of overcultivation,overgrazing and over collection of fuel wood and Chinese herb medicine based on the fragile ecological condition. (3)desertified land in Yanchi will be treated by strictly implementation of law and regulation related desertification combating and national key projects of reversion of arable land to forest and rangeland, otherwise, desertification will become more serious. The continuous implementation of policy of reversion of arable land to forest and rangeland will be the key factor related to the desertification combating in Yanchi.
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Received: 21 March 2003
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