Key driving forces of desertification in the Mu Us Desert, China.
Key driving forces of desertification in the Mu Us Desert, China.
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DOI：
10.1038/s41598-017-04363-8
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发表时间：
2017-06-21
影响因子：
4.6
通讯作者：
Zhu B
中科院分区：
文献类型：
--
作者：
Wang X;Cheng H;Li H;Lou J;Hua T;Liu W;Jiao L;Ma W;Li D;Zhu B
毛乌素沙漠荒漠化的时间趋势和主要驱动力是亚洲最干旱地区荒漠化风险高的代表。通过野外调查、采样、风洞实验、粒度和养分测定以及风沙输送潜力统计等方法，分析了毛乌素沙漠风沙输送对沙漠化的重要意义。结果表明，高强度的风成过程可能会导致低差异的风成输运，尽管下伏沉积物的差异。当20世纪70年代发生严重荒漠化时，铵态氮、硝态氮、速效钾和速效磷的年损失分别约为116、312、46，436和1，251 kg km−2。2010年以后，损失量分别为8、20、3,208和84千克km−2，总体上仅为20世纪70年代的6.7%。结果表明，尽管人类活动可能引发荒漠化，但风沙输送的急剧减少和低养分流失可能是该地区发生恢复的关键驱动力。
The temporal trends and key driving forces of desertification in the Mu Us Desert are representatives of most arid regions of Asia with a high risk of desertification. We analyzed the significance of Aeolian transport on desertification in the Mu Us Desert by field investigations, sampling, wind tunnel experiments, particle size and nutrient measurements, and statistics on aeolian transport potentials. The results showed that high intensities of aeolian processes may result in low differences in aeolian transport despite differences in the underlying sediments. When high desertification occurred in the 1970s, the annual losses of the ammonium N, nitrate N, available K, and available P were approximately 116, 312, 46,436, and 1,251 kg km−2, respectively. After 2010, the losses were only 8, 20, 3,208, and 84 kg km−2, which were generally only 6.7% of those in the 1970s. The results showed that although human activity may trigger desertification, the dramatic decline of aeolian transport and low nutrient loss may be the key driving forces for the occurrence of rehabilitation in this region.