Influence of ecological land change on wind erosion prevention service in arid area of northwest China from 1990 to 2015
Influence of ecological land change on wind erosion prevention service in arid area of northwest China from 1990 to 2015
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1990-2015年西北干旱区生态用地变化对风蚀防治服务的影响
DOI：
10.1016/j.ecolind.2020.106686
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发表时间：
2020-10
影响因子：
6.9
通讯作者：
Zhang Hongqi
中科院分区：
文献类型：
--
作者：
Li Dajing;Xu Erqi;Zhang Hongqi
作为减缓荒漠化扩展的重要“缓冲器”，生态用地能够提供防风蚀服务（WEPS），与区域生态安全和人类福祉息息相关。以往的研究主要集中在WEPS对土地利用变化的响应上，在一定程度上容易产生不确定性，同一类型的WEPS会受到不同物理和人为因素的影响，从而进一步改变WEPS。为解决这一问题，从土地的主体功能出发，定义了生态用地这一新的指标，并定量测度了生态用地变化对流域水环境保护的影响。结果表明：（1）1990-2015年，生态用地净减少16,244 km 2，减少率为17.74%。所有二级生态用地类型均呈减少趋势。(2)塔里木盆地年平均WEPS率为34.82%，25年间上升了1.42%。(3)绿洲面积的扩大和二级生态地类型由低植被覆盖度向高植被覆盖度的转化是湿地生态系统的增长的主要原因。生态用地向沙漠化的转化是导致流域生态环境恶化的主要原因。1990-2015年，生态用地的保护和有效管理改善了生态环境，增加了部分地区的地表遮蔽物，有利于流域水环境质量的改善。
As an important “buffer” to slow down the expansion of desertification, ecological land can provide wind erosion prevention service (WEPS), which is closely related to regional ecological security and human well-being. Previous studies have focused on the response of WEPS to land use change, to a certain extent, would easily cause uncertainties, where the same type can be influenced by different physical and anthropogenic factors and further alter the WEPS. To solve this problem, ecological land was defined from the main function of land in this paper as a new indicator, and the impact of ecological land change on WEPS was quantitatively measured. The results indicated the following: (1) During the period 1990–2015, the net area of ecological land reduced by 16,244 km2or 17.74%. All second-level types of ecological land experienced a decreasing trend. (2) The annual average WEPS rate in the Tarim Basin was 34.82%, which increased by 1.42% across the 25 year period. (3) The increase of WEPS was mainly attributed to the expansion of oasis and the transformation of second-level ecological land types from low vegetation coverage to high vegetation coverage. The transformation of ecological land to desert was the main reason for the deterioration in WEPS. In the period 1990–2015, the protection and effective management of ecological land improved the ecological environment and increased the surface shelter in some regions, which was conducive to the improvement in WEPS.
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