%0 Journal Article %A WANG Gui-zhen %A MA Su-jie %A YANG Si-wei %A NIU Yu-jie %A HUA Li-min %T The Ecological Assessment of Different Rangeland Types Based on Rainfall Use Efficiency in Hexi Corridor Area %D 2017 %R 10.11849/zrzyxb.20160278 %J JOURNAL OF NATURAL RESOURCES %P 582-594 %V 32 %N 4 %X

Using rainfall use efficiency (RUE) as index, we carried out the ecological assessment of typical rangeland types in Hexi Corridor, including temperate desert, alpine meadow and temperate rangeland. By extracting vegetation index, interpreting rainfall with Co-Kriging method and overlying multiple maps, we obtained RUE(NDVI), RUE(PVI) and RUE(TSAVI) in Hexi Corridor. By crrelation analysis between different RUEs and aboveground biomass, suitable RUE for each type of rangeland is selected as index to evaluate the ecological process. The result showed that: 1) The correlation between RUE(PVI) and aboveground biomass is the highest in temperate desert, correlation coefficient being 0.879. The correlation between RUE(NDVI) and aboveground biomass is the highest in alpine meadow, correlation coefficient being 0.876. The correlation between RUE(TSAVI) and aboveground biomass is the highest in temperate rangeland, correlation coefficient being 0.895. 2) The temperate desert is in ecological degraded process, since RUE(PVI) in the range of -11.291--2.000, -1.999-0.000 and 2.001-6.000 is in increasing trend and RUE(PVI) in the range of 0.001-2.000 and 6.001-43.918 is in decreasing trend. The temperate rangeland is also in ecological degraded process, since RUE(TSAVI) in the range of -3.2×10-3-0.8×10-3 and 1.4×10-3-2.4×10-3 is in increasing trend and RUE(TSAVI) in the range of 0.8×10-3-1.4×10-3 and 2.4×10-3-3.4×10-3 is in decreasing trend. On opposite, alpine meadow is in ecological recovery process, since RUE(NDVI) in the range of 18.001-36.000 is in decreasing trend and RUE(NDVI) in the range of -6.765-6.000, 6.001-10.000 and 10.001-18.000 is in increasing trend. We believe that selecting appropriate RUE for different type of rangeland as the assessment index is feasible and reliable in theory and practice.

%U https://www.jnr.ac.cn/EN/10.11849/zrzyxb.20160278