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[1]YAN Junjie,LIU Haijun,ZHAO Yu,et al.Spatiotemporal Dynamics of Grassland Net Primary Productivity in Ili River Valley from 2000 to 2015[J].Research of Soil and Water Conservation,2018,25(05):390-396.

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Spatiotemporal Dynamics of Grassland Net Primary Productivity in Ili River Valley from 2000 to 2015

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 05 Page number: 390-396 Column: Public date: 2018-09-06

Title:: Spatiotemporal Dynamics of Grassland Net Primary Productivity in Ili River Valley from 2000 to 2015

Author(s):: YAN Junjie^1,2,3, LIU Haijun¹, ZHAO Yu¹, CUI Dong¹, LIU Ying¹; 1. College of Biology and Geography, Yili Normal University, Yining, Xinjiang 835000, China;
2. Xinjiang Institute of Ecology and Geography, CAS, Xinjiang Urumqi 830011, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: spatioemporal dynamics of NPP; Modis data; grassland; Ili River Valley

CLC:: Q948

DOI:: -

Abstract:: Based on the Modis NPP remote sensing data, we analyzed the spatiotemporal dynamics of grassland NPP from 2000 to 2015 in Ili River Valley by means of GIS spatial analysis technology, Mann-Kendall test and Theil-Sen median trend analysis. The results showed that:(1) the annual grassland NPP of the whole Ili River Valley was 272.99 g C/(m²·a); NPP of most part of the grassland in Ili River Valley was between 200~400 g C/(m²·a), and they mainly distributed at Zhaosu Basin, and the middle and high mountains around the valley; mountain meadow was the most widely distributed among all grassland types, and its average NPP was the highest; (2) NPP of grassland in Ili River Valley showed a non-significant decreasing trend in general, and the average decrease rate was 0.94 g C/(m²·a); NPP of 73.94% grassland in the whole area decreased, and the decrease rate was mainly between 1.0~5.0 g C/(m²·a); the types were mainly mountain meadow, warm steppe and alpine meadow; (3) generally speaking, the decrease rate of the grassland NPP in Ili River Valley increased gradually with the increase of NPP, and those ranging between 300~400 g C/(m²·a) had the largest average decrease rate; (4) for the variation of the increase rate of grassland NPP along the elevation, the decrease of NPP in the 1 000~2 000 m elevation was the most obvious, and grassland with increasing NPP mostly distributed at the elevation of 2 000~3 000 m.

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