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- W2366441610 abstract "This paper analyzed several aspects of the spatio-temporal variations in the vegetation cover in the middle Heihe River Basin,and developed a grey correlation model of ecosystem to identify the determining factors.The results demonstrated that 1) the annual maximum normalized difference vegetation index(NDVI) increased considerably in upland,grassland with low vegetation cover,and forested area,by about 0.1~0.2;while sparse woodland has maintained a rapid growth since 2004with the annual maximum NDVI increased by 0.21;2) the annual maximum vegetation cover for the study area as a whole has increased by 0.0063per annum,the change is most significant in Ganzhou District,where the annual growth was mostly around 0.03~0.3,however,for some oasis-desert transition zones in Linze and Gaotai,the vegetation cover decreased by 0.1~0.3;3) the vegetation cover from July to October showed significant growth trends,the peak increased and delayed about one month,reaching 0.39in 2007;the hierarchical structure of the annual maximum vegetation cover optimized,the lowest vegetation cover gradually transformed into low vegetation cover,decreased by 25% from 2000to 2007,and the highest vegetation cover increased approximately 16% from 1998to 2008;4) the results of correlation analysis showed that the main meteorological and hydrological factors were rainfall,evaporation and runoff,with the maximum correlations of 0.91,-0.83,0.76,respectively,and that the main socio-economic factors were agricultural acreage,primary industry and the level of agricultural science and technology,with the maximum correlation were-0.81,0.78,0.81,respectively." @default.
- W2366441610 created "2016-06-24" @default.
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- W2366441610 date "2014-01-01" @default.
- W2366441610 modified "2023-09-26" @default.
- W2366441610 title "Changes in the ecological environment and there determining factors in the middle Heihe River Basin" @default.
- W2366441610 hasPublicationYear "2014" @default.
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