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| Evaluation of Land Ecological Security in EcologicallyFragile Region of Shannan City Based on PSR Model |
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| DOI：10.16768/j.issn.1004-874X.2022.06.012 |
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| Abstract: |
| 【Objective】The study evaluated the land ecological security in Shannan City of Tibet Autonomous Region,
revealed the main factors affecting the land ecological security, with a view to providing reasonable suggestions for the
realization of ecological environment protection and sustainable land use in Shannan City, and promoting the sustainable
and healthy economic development on the premise of ensuring the land ecological security. 【Method】An evaluation
index system of land ecological security was established based on Pressure-State-Response (PSR) Model to evaluate the
state of land ecological security in the city from 2010 to 2020, and the main factors affecting land ecological security were
identified by Obstacle Degree Model (ODM).【Result】From 2010 to 2016, the land ecological security index of Shannan
City was between 0.41 and 0.50, showing a slight fluctuation. It continued to decrease from 2016 to 2018, and decreased to
0.44. From 2018 to 2020, the land ecological security index increased rapidly from 0.44 to 0.69, which was closely related to the economic development and ecological environment protection strategies of Shannan City. Among the pressure, state and
response indexes, the impact of pressure index on ecological security had little change, and its proportion in ecological security
index increased from 29.19% in 2010 to 31.46% in 2020. The influence of state index decreased significantly from 41.62%
in 2010 to 29.39% in 2020. The influence of response index increased significantly, from 29.19% in 2010 to 39.16% in 2020.
The main influencing factors of land ecological security in Shannan City from 2010 to 2020 were per capita GDP, per capita
rural disposable income, annual expenditure of environmental protection and fixed-asset investment.【Conclusion】In order
to en sure the land ecological security of Shannan City, it is suggested to increase the annual expenditure of environmental
protection and optimize the investment structure of fixed assets in a coordinated way while developing economy rapidly and
increasing per capita GDP and rural per capita disposable income in the future. |
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