Journal of Resources and Ecology ›› 2021, Vol. 12 ›› Issue (6): 743-756.DOI: 10.5814/j.issn.1674-764x.2021.06.003

• Ecosystem Assessment in Altay Region • Previous Articles     Next Articles

Quantitative Assessment of the Effects of Climate Change and Human Activities on Grassland NPP in Altay Prefecture

TIAN Jie1(), XIONG Junnan1, ZHANG Yichi2,*(), CHENG Weiming3,4,5,6, HE Yuchuan1, YE Chongchong1, HE Wen1   

  1. 1. School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China
    2. Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Science and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
    3. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
    4. University of Chinese Academy of Sciences, Beijing 100049, China
    5. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
    6. Collaborative Innovation Center of South China Sea Studies, Nanjing 210093, China
  • Received:2021-04-01 Accepted:2021-06-15 Online:2021-11-30 Published:2022-01-30
  • Contact: ZHANG Yichi
  • About author:TIAN Jie, E-mail: tj104959@163.com
  • Supported by:
    The Science and Technology Project of Xizang Autonomous Region(XZ201901-GA-07);The Key Research and Development Project of Sichuan Science and Technology Department(2021YFQ0042);The Science and Technology Bureau of Altay Region in Yili Kazak Autonomous Prefecture(Y99M4600AL)

Abstract:

Grassland degradation in Altay Prefecture is of considerable concern as it is a threat that hinders the sustainable development of the local economy and the stable operation of the livestock industry. Quantitative assessment of the relative contributions of climate change and human activities, which are considered as the dominant triggers of grassland degradation, to grassland variation is crucial for understanding the grassland degradation mechanism and mitigating the degraded grassland in Altay Prefecture. In this paper, the Carnegie-Ames-Stanford Approach model and the Thornthwaite memorial model were adopted to simulate the actual net primary productivity (NPPA) and potential net primary productivity (NPPP) in the Altay Prefecture from 2000 to 2019. Meanwhile, the difference between potential NPP and actual NPP was employed to reflect the effects of human activities (NPPH) on the grassland. On this basis, we validated the viability of the simulated NPP using the Pearson correlation coefficient, investigated the spatiotemporal variability of grassland productivity, and established comprehensive scenarios to quantitatively assess the relative roles of climate change and human activities on grassland in Altay prefecture. The results indicate three main points. (1) The simulated NPPA was highly consistent with the MOD17A3 dataset in spatial distribution. (2) Regions with an increased NPPA accounted for 70.53% of the total grassland, whereas 29.47% of the total grassland area experienced a decrease. At the temporal scale, the NPPA presented a slightly increasing trend (0.83 g C m?2 yr?1) over the study period, while the trends of NPPP and NPPH were reduced (?1.31 and ?2.15 g C m?2 yr?1). (3) Compared with climate change, human activities played a key role in the process of grassland restoration, as 66.98% of restored grassland resulted from it. In contrast, inter-annual climate change is the primary cause of grassland degradation, as it influenced 55.70% of degraded grassland. These results could shed light on the mechanisms of grassland variation caused by climate change and human activities, and they can be applied to further develop efficient measures to combat desertification in Altay Prefecture.

Key words: grassland degradation, net primary productivity, climate change, human activities, Altay Prefecture