JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (4): 582-594.doi: 10.11849/zrzyxb.20160278

• Resource Ecology • Previous Articles     Next Articles

The Ecological Assessment of Different Rangeland Types Based on Rainfall Use Efficiency in Hexi Corridor Area

WANG Gui-zhen, MA Su-jie, YANG Si-wei, NIU Yu-jie, HUA Li-min   

  1. College of Grassland Science, Gansu Agricultural University/ Key Laboratory of Grassland Ecosystem of the Ministry of Education/ Gansu Agricultural University & Massey University Research Center for Grassland Biodiversity, Lanzhou 730070, China
  • Received:2016-03-17 Revised:2016-12-15 Online:2017-04-20 Published:2017-04-20
  • Supported by:

    National Natural Science Foundation of China, No.31460635

Abstract:

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.

Key words: alpine meadow, ecological assessment, Hexi Corridor, rainfall use efficiency, temperate desert, temperate rangeland

CLC Number: 

  • S812