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| Appraisal of land use suitability on the background of Grain for Green in the Loess Plateau:A case study in Majiagou Catchment of Ansai County |
| Wan Long1,Zhang Xiaoping1,2,Chen Fengjuan1,Wu Yan1,Fu Yanling1,Liu Guobin1,2 |
1.College of Resources and Environment,Northwest Agriculture & Forest University: 2.Insititute of Soil and Water Conservation,Chinese Academy of
Sciences and Ministry of Water Resources: 712100,Yangling,Shaanxi,China |
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Abstract Land use suitability has a great impact on the ecosystem development and soil erosion of the Loess Plateau.Since the implementation of "Grain for Green" policy in 1999,the land use was expected to be more rational.This paper took the Majiagou Catchment of Ansai County in the Loess Plateau as example to appraise the land use suitability change over nearly 20 years.The factors influencing land fertility and moisture just like slope degree,soil erosion intensity and the position of landform were used to appraise the land use suitability.The results showed as follows: 1)The area of farmland decreased by 11.74% from 1990 to 2008;the area of woodland increased by 11.54% and the area of orchard increased by 1.82%.Land use type transferring mainly happened on the slopes greater than 15°.2) The land use rationality index of the catchment was calculated and found that from 1990 to 2008 this index was increased from 0.64 to 0.67.3) In 2008,the area of farmland,woodland and grassland were 21.17%,19.57%,56.62% in the catchment.The area of farmland with high suitability(suitability index A>0.8) and middle suitability(0.5≤A≤0.8) were respectively 1.31% and 21.27% of total farmland area.About 77.42% area of farmland was low suitable(A0.7),middle(0.5≤A≤0.7) and low suitability(A0.7) and middle(0.4≤A≤0.7) suitable levels was about 24.87% and 75.13% respectively.
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Received: 25 November 2009
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