Spatial differences of aeolian desertification responses to climate in arid Asia
Spatial differences of aeolian desertification responses to climate in arid Asia
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DOI：
10.1016/j.gloplacha.2016.11.008
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发表时间：
2017
影响因子：
3.9
通讯作者：
Xunming Wang;Ting Hua;L. Lang;Wenyong Ma
中科院分区：
文献类型：
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作者：
Xunming Wang;Ting Hua;L. Lang;Wenyong Ma
亚洲干旱地区的大部分地区被风沙沙丘、沙层、砾石和沙漠草原覆盖，如果气候变化加剧风沙荒漠化，可能会危及近3.5亿人。虽然人们普遍认识到风沙荒漠化主要是由气候变化引起的，但人们对风沙荒漠化对各种气候情景的反应知之甚少。基于沙丘活动指数(DAI)趋势和风沙荒漠化的紧密结合，本文报告了不同气候情景下风沙荒漠化响应的空间差异。分析结果表明，温度、降水和风况的变化对极端干旱的亚洲地区的风沙荒漠化没有显著的贡献。从植被生长的早期到开花期，尽管气温上升可能有利于一些高纬度和海拔地区的植被生长，但气温上升可能会加剧蒙古、西亚和中亚等大多数干旱亚洲地区的风沙荒漠化。在干旱的亚洲，尽管降水增加可能有助于恢复，但降水减少并不是极端干旱地区风沙荒漠化发生的关键因素。从植被生长的早期到盛花期，风沙荒漠化对风向的敏感度的空间变化趋势各不相同。总体而言，在区域尺度上，干旱亚洲东部和西部地区的风沙荒漠化对气候变化具有较高的敏感性，中部地区的气候变化可能不会对风沙荒漠化的发生起重要作用。风沙荒漠化对气候变化响应的空间差异表明，亚洲干旱地区的不同地区需要采取不同的防沙治沙战略。
Most areas of arid Asia are covered by aeolian dunes, sand sheets, gravels, and desert steppes, and may jeopardize nearly 350 million people if climate change increases aeolian desertification. Although the aeolian desertification is mainly triggered by climate changes are extensively acknowledged, the responses of aeolian desertification to various climate scenarios are poorly understood. Based on the tight combinations of dune activity index (DAI) trends and of aeolian desertification, here the spatial differences of aeolian desertification responses on various climate scenarios were reported. The analyzed results show that the variations in temperature, precipitation and wind regime have no significant contributions on aeolian desertification in the extremely arid Asia. From the early to blooming periods of vegetation growth, although temperature rise may benefit vegetation growths in some high latitudes and altitudes, the temperature rise may increase aeolian desertification in most arid Asia regions such as Mongolia, West and Central Asia. In arid Asia, although precipitation increases may benefit the rehabilitation, decreases in precipitation is not the key role on aeolian desertification occurrences in extremely arid regions. From the early to blooming periods of vegetation growths, spatial trends of the sensitivity of aeolian desertification to wind regime varied. Generally, at the regional scales there are relative high sensitivities for aeolian desertification to climate changes in the eastern and western regions of arid Asia, and the climate changes may not play important roles on aeolian desertification occurrence in the central regions. The spatial differences of aeolian desertification responses to climate changes indicate various strategies for aeolian desertification combating are needed in different regions of arid Asia.