JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (7): 1125-1133.doi: 10.11849/zrzyxb.20160736

• Resource Ecology • Previous Articles     Next Articles

Effects of Human Activities on Net Primary Productivityin the Xilingol Grassland

ZHANG Jun, REN Hong-rui   

  1. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2016-07-11 Revised:2016-10-10 Online:2017-08-02 Published:2017-08-02
  • Supported by:
    National Natural Science Foundation of China, No. 41301053The Innovative Talents of Higher Learning Institutions of ShanxiNatural Science Foundation of Shanxi, No. 2013021030-1.

Abstract: Net primary productivity is a key index of production capacity of grassland ecosystem, and is also an important indicator of carbon fixation of ecosystem. With MODIS MOD17A3 net primary productivity (NPP) data and meteorological data, we analyzed the effects of human activities on NPP in the Xilingol grassland from 2001 to 2010. NPPA (actual NPP) was influenced by both climate change and human activities. NPPA was mainly in the range of 41.32-362.27 g C·m-2·a-1 with average value of 150.78 g C·m-2·a-1, and showed horizontal zonal feature gradually decreasing from east to west. NPPA in the meadow steppe was the highest, followed by that in typical steppe, while NPPA in the desert steppe was the lowest. NPPH (NPP affected by human activities) was mainly in the range of -185.07- 153.92 g C·m-2·a-1 with average value of -34.80 g C·m-2·a-1 in the Xilingol grassland. Human activities had negative effects on 93.4% of the study area, and had positive effects on only 6.6% of the area. However, the impact of human activities on NPP is changing from negative effect to positive effect in most of the area. There is a boundary between the southern and the northern Xilingol grassland. The negative effect is strengthening in the southern area, while the positive effect is strengthening in the northern area. The study provided references for the management and sustainable utilization of grassland resources in the Xilingol.

Key words: human activities, NPP, Xilingol grassland

CLC Number: 

  • Q148