Cultivation impacts on soil texture during oasis expansion in Xinjiang, Northwest China: Wind erosion effects
Cultivation impacts on soil texture during oasis expansion in Xinjiang, Northwest China: Wind erosion effects
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DOI：
10.1016/j.aeolia.2020.100646
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发表时间：
2021-04-27
期刊：
影响因子：
3.3
通讯作者：
Li, Shengyu
中科院分区：
文献类型：
--
作者：
Song, Qin;Gao, Xin;Li, Shengyu
为探讨绿洲扩展过程中耕作对土壤质地的影响，在新疆干旱荒漠区进行了野外调查和遥感监测。我们通过将2019年的耕地和未耕地与中国第二次全国土壤普查的成对参考土地进行比较，评估了可能的变化。结果表明，随着耕作年限的增加，耕地土壤粘粒含量和粉粒含量呈增加趋势（p < 0.05），而砂粒含量呈下降趋势。对2019年和20世纪70年代末的粘土和淤泥含量进行比较，发现绿洲中心的细颗粒积聚，边缘的细颗粒被去除。新开垦地、绿洲边缘未开垦地和桑迪的含沙量增加。对15个成对参考样的比较表明，在大多数样地中，耕地的粘粒含量和粉粒含量高于邻近的未开垦地，但也有部分样地呈现出下降的趋势，这表明农业耕作并不总是增加细颗粒。我们的结论是，开垦前的土壤质地的初始差异和开垦历史共同导致耕地和邻近的未开垦土地之间的土壤质地的差异。在绿洲扩展过程中，对桑迪的开垦可以减少风蚀，表明适当的农业开垦和保护措施可以减轻土壤质地变化的不利影响。
To explore the cultivation effects on soil texture at local and regional scales during the expansion of oases, a field survey combined with remote sensing monitoring was conducted in the arid desert regions in Xinjiang, Northwest China. We evaluated possible changes by comparing cultivated and uncultivated lands in 2019 with paired reference lands from the Second National Soil Survey of China. The results showed that the clay content and the silt content in cultivated land increased with cultivation years (p < 0.05), while the sand content decreased. A comparison of the clay plus silt content between 2019 and the late 1970s revealed the accumulation of fine particles in the center of oases and the removal of fine particles at their edges. Our results also demonstrate that sand content increased in the newly reclaimed land, the uncultivated land at the edge of the oases, and the sandy land. A comparison of 15 paired reference samples indicated that in most plots, clay content and silt content in croplands are higher than in adjacent uncultivated lands, although some plots showed a decreasing trend, implying that agricultural cultivation dose not always increase fine particles. We conclude that the initial difference in soil texture before reclamation and reclamation history jointly result in differences in soil texture between cultivated and adjacent uncultivated lands. During oasis expansion, the reclamation of the sandy land can reduce wind erosion, suggesting that appropriate agricultural reclamation and conservation measures can mitigate the adverse effects of changes in soil texture.