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Arid Land Geography >

2022 , Vol. 45 >Issue 5: 1481 - 1489

DOI: https://doi.org/10.12118/j.issn.1000-6060.2021.606

Earth Surface Process

Temporal and spatial characteristics of fractional vegetation coverage and its response to climatic factors in southern Xinjiang in recent 20 years: A case of Taxkorgan Tajik Autonomous County

  • Yuting LIU ,
  • Qifei ZHANG ,
  • Jingshi LIU ,
  • Hanxiao GUAN ,
  • Fanxue MENG
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  • 1. School of Life and Geography, Kashi University/Key Laboratory of Biological Resources and Ecology of Pamirs Plateau in Xinjiang Uygur Autonomous Region, Kashi 844000, Xinjiang, China
    2. School of Geographical Sciences, Shanxi Normal University, Taiyuan 030000, Shanxi, China
    3. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
    4. Institute of Tibet Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
    5. Kashi Regional Meteorological Bureau, Kashi 844000, Xinjiang, China

Received date: 2021-12-06

  Revised date: 2022-01-11

  Online published: 2022-10-20

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Abstract

Fractional vegetation coverage (FVC) is an evaluation index that reflects the quality of the ecological environment. Understanding changes in fractional vegetation coverage is a critical part of developing a more ecological civilization, as well as regional agriculture, animal husbandry planning, and environmental protection. Based on the normalized difference vegetation index from 2001 to 2020, and taking into consideration the types of vegetation on cultivated land, forested land, and grassland, the mixed pixel dichotomy model is used to calculate fractional vegetation coverage. The spatial and temporal characteristics of fractional vegetation coverage in Taxkorgan Tajik Autonomous County of Xinjiang, China are analyzed using methods of spatial stability analysis, Sen+Mann-Kendall spatial trend analysis and linear regression. At the same time, combined with temperature and precipitation data, the impact of climate factors on FVC is analyzed using Spearman correlation analysis and GIS spatial analysis. The results showed that (1) over the past 20 years, fractional vegetation coverage was concentrated in the middle fractional vegetation coverage area, and fractional vegetation coverage decreased by 4.79%. (2) The spatial stability of fractional vegetation coverage fluctuated slightly, with fluctuations (37.3%) and moderate fluctuations (32.7%); The fractional vegetation coverage decreased both significantly and not significantly, with decreases of 3.8% and 54.5% of the total area, respectively. (3) The vegetation status of cultivated land, forested land, and grassland showed slight, varying degrees of degradation. Fractional vegetation coverage decreased by 4.57%, 6.32%, and 4.24% respectively. In terms of spatial stability values, which were 51.28%, 54.48%, and 52.29%, respectively, there was no significant reduction. (4) From 2001 to 2020, degrees of spatial stability and degradation on cultivated land were slower and more stable than on forested land and grassland, and forested land saw more significant degradation than cultivated land and grassland. Changes in fractional vegetation coverage observed in the study area were small and showed a slight downward trend. Human activity was the main contributing factor affecting vegetation growth.

Key words： dimidiate pixel model; fractional vegetation coverage (FVC); Sen+Mann-Kendall; spatial stability; climate factors

Cite this article

Yuting LIU , Qifei ZHANG , Jingshi LIU , Hanxiao GUAN , Fanxue MENG . Temporal and spatial characteristics of fractional vegetation coverage and its response to climatic factors in southern Xinjiang in recent 20 years: A case of Taxkorgan Tajik Autonomous County[J]. Arid Land Geography, 2022 , 45(5) : 1481 -1489 . DOI: 10.12118/j.issn.1000-6060.2021.606

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