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| Effects of land desertification on ecosystem service value |
| Wang Shuli,Yang Guangwei,Zhou Yanyang |
| Forestry Academy,Northern East Forestry University,150040,Harbin,China |
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Abstract By using the method of combining the investigation and remote sensing date,introducing the effecting index of desertification degree on ecosystem service value,based on the area,desertification degree and distribution pattern of the different land using types,the effects of land desertification on ecosystem service value were studied.It is shown that: 1) Desertification land area rate within desertification region is 76.66%.The desertification area rate of grassland is the biggest,the desertification degree of grassland and unused land are also the biggest,but the desertification area rate and desertification degree of forest land and cultivating land are smaller than that of grassland and unused land. Light and middle degree desertification land mainly distribute on cultivating land,forest land and most part of grassland.Heavy degree and extra heavy degree desertification land mainly distribute on unused land and few part of grassland.The desertification area rate and desertification degree of Linxi county,Wengniute county,Right Balin county,Left Balin county,Aohan county and Arlukerqin county are bigger and heavier than that of other counties,and that of Hongshan county is the smallest and lightest.(2)Total ecosystem service value reduced 7 992.41 million yuan per year because of desertification.The reducing value is bigger in Aohan county,Wengniute county,Right Balin county and Arlukerqin county than that of other counties,which reduced 1 639.74 million yuan per year,1 663.94 million yuan per year,1 539.27 million yuan per year and 1 365.89 million yuan per year respectively.Reducing rate of value in Linxi county is biggest,which reached 23.47%.Both reducing value and reducing rate in Hongshan county are smallest,which reached 4.11 million yuan per year and 2.63% respectively.Reducing value of soil forming and protecting service of ecosystem are the biggest,which reached 1 786.77 million yuan per year.Reducing rate of food production service is the biggest,which reached 20.65%.Both reducing value and reducing rate of amusement are the smallest,which reached 231.39 million yuan per year and 13.34% respectively.
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Received: 26 August 2007
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