Effects of Land Use Changes on Ecological Sensitivity of Nyang River Basin in Tibet

Hao Shouning; Su Libin; Guo Yonggang

doi:10.13961/j.cnki.stbctb.2023.02.035

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Effects of Land Use Changes on Ecological Sensitivity of Nyang River Basin in Tibet

- Effects of Land Use Changes on Ecological Sensitivity of Nyang River Basin in Tibet
- Bulletin of Soiland Water Conservation Vol. 43, Issue 2, Pages: 303-309(2023)
- 作者机构：
  
  1. 西藏大学生态环境学院,西藏,拉萨,850000
  2. 西藏农牧学院,西藏,林芝,860000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2023.02.035
  CLC： X171
- Published：2023
- 稿件说明：
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Hao Shouning, Su Libin, Guo Yonggang. Effects of Land Use Changes on Ecological Sensitivity of Nyang River Basin in Tibet[J]. Bulletin of Soiland Water Conservation, 2023, 43(2): 303-309.
DOI：

Hao Shouning, Su Libin, Guo Yonggang. Effects of Land Use Changes on Ecological Sensitivity of Nyang River Basin in Tibet[J]. Bulletin of Soiland Water Conservation, 2023, 43(2): 303-309. DOI： 10.13961/j.cnki.stbctb.2023.02.035.

摘要

[目的] 以西藏尼洋河流域作为高原生态脆弱区的典型代表，对流域1995—2020年土地利用变化影响下的生态敏感性进行探索分析，为该流域土地利用规划和生态环境保护提供理论依据。[方法] 通过计算流域土地利用强度指数和生态系统服务价值，构建土地利用变化下的生态敏感性指数，基于土地利用强度指数和生态系统服务价值在各子流域内的时空变化，利用GIS空间分析技术获得尼洋河流域生态敏感性空间分布状况。[结果] 1995—2020年尼洋河流域林地和建筑用地面积呈增加的趋势，而未利用地和水域面积呈下降趋势；土地利用强度指数由1.725 5上升到1.725 9，土地利用生态系统服务价值减少了约3 000万元。土地利用强度指数上升的区域分布在下游流域；流域生态敏感性指数由0.3增加到9.4，流域中、高敏感区主要分布在中下游流域，且高敏感区面积呈扩增趋势。[结论] 流域内区域生态敏感性变化由土地利用类型间的转移流动的方向所决定。总体而言，近25 a来流域生态敏感性对生态系统中土地利用变化的响应较为明显，中下游区域生态敏感性呈恶化的趋势。

Abstract

[Objective] The ecological sensitivity of the the Nyang River basin in Tibet (a typical ecologically fragile plateau area) under land use changes during 1995—2020 was studied in order to provide theoretical references for land use planning and ecological environment protection in the watershed. [Methods] We calculated the watershed land use intensity index and the ecosystem service value to construct the land use change. The ecological sensitivity index was based on the temporal and spatial changes of the land use intensity index and the ecosystem service value in each sub-basin. The spatial distribution of ecological sensitivity in the Nyang River basin was obtained using GIS spatial analysis technology. [Results] The areas of woodland and construction land in the Nyang River basin increased from 1995 to 2020

while the unused land area and water area declined. The land use intensity index increased from 1.725 5 to 1.725 9

and the ecosystem service value of land use decreased about 30 million yuan. The areas exhibiting increasing intensity index were located in the downstream basin. The ecological sensitivity index of the basin increased from 0.3 to 9.4. The middle and high sensitive areas of the basin were mainly located in the middle and lower reaches. The extent of the high sensitive areas was increasing. [Conclusion] The change in regional ecological sensitivity for the watershed was determined by the direction of transfer and flow between land use types. Overall

the ecological sensitivity of the basin has responded more significantly to land use changes in the ecosystem over the last 25 years

with a deteriorating trend in the middle and lower reaches.

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