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《Arid Zone Research》 2010-05
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Evaluation on Actuality and Productivity of Arid Grassland Resources in the Hexi Corridor of Gansu Province Using 3S Technology and Field Survey

YU Lian-ping1,CHENG Wen-ding1,LI Xing-hai2,LI Xin-yuan1,CHEN Xing-rong1(1.Gansu Province General Station for Grassland Technical Popularization,Lanzhou 730010,China;2.Yongchang County Station for Grassland Technical Popularization,Jinchang 737200,Gansu,China)  
In this study,the Landsat TM images are used as the data sources to classify the types of natural grasslands,extract the vegetation indexes,and develop the models for estimating the edible herbage yields of the natural grasslands in Yongchang County,Ganzhou District and Suzhou District in the Hexi Corridor of Gansu Province using the integrative technology of RS,GIS and GPS based on the field survey and the references of the related maps and knowledge.The natural grasslands in the study area are classified into 6 types including the temperate deserts(4.75 ×105 hm2,71.48% of the total),temperate steppes(8.32 ×104 hm2,12.51%),low-flat meadows(4.69 × 104 hm2,7.04%),high-cold shrub-meadows(2.73 × 104 hm2,4.10%),high-cold meadows(6 911 hm2,1.04%),and temperate desert steppes(2.54 × 104 hm2,3.83%).The theoretical carrying capacity of all the grasslands in the study area are 1.77 × 105 sheep units,but the actual livestock are 2.71 × 105 sheep units,and the overgrazing rate is as high as 53.16%.The carrying capacity of the natural grasslands is decreased in varying degrees compared with that in the 1980's.
【Fund】: 全球环境基金赠款项目“甘肃省半农半牧区草地资源及生物多样性调查”(052456CHA-GS-J-2)
【CateGory Index】: S812
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