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| Dynamic change of land use and its ecological effects on the Loess Plateau |
| Meng Qingxiang1,2,Liu Guobin2,Yang Qinke2 |
| 1.College of Resources and Environment,Henan Agriculture University,450002,Zhengzhou;2.Institute of Soil and Water Conservation,CAS & MWR,712100,Yangling,Shaanxi: China |
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Abstract Based on RS,GIS and related data,the paper analyzed the land use change on the Loess Plateau between 1986 and 1997.With the Markov Model,the land use change in the future was forecasted,and the relation between land use and ecological effect by ecological response limit was studied.Results showed that the land use dynamic change on the Loess Plateau is remarkable,the relative value of which is larger than the absolute value,and land use has changed obviously between land use types.The descending order of land use change rate is grass with high coverage,construction land,other forest land,shrub land,irrigated land, water body,waste land,wood land,rainfed land and other grass land.Land use dynmic change index is 2.17%,from vertical c.g.index change,status of other grass land and irrigated land is improving,stock raising is suitablerice,food need drives the ascend of vertical c.g.index of rainfed and irrigated land and forest land.land use dynmic change index of irrigated land and other grass land is decline,and others is raise;ecological response limit is 5.17,7.30,7.60 and 7.65 in 1986,1997,2008 and 2019,ecological response limit is uptrend,but range is decrescent.
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Received: 18 February 2008
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