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首页> 外文期刊>Agricultural and Forest Meteorology >Disentangling the formation and evolvement mechanism of plants-induced dried soil layers on China’s Loess Plateau
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Disentangling the formation and evolvement mechanism of plants-induced dried soil layers on China’s Loess Plateau

机译：解解植物诱导的植物干燥土层的形成和演变机制在中国黄土高原上的干燥土层

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The extent of the effect of China’s Loess Plateau on global climate change partially depends on the achievements of the Grain for Green Program (GFGP). This region is prone to drought problems, especially the widespread creation of dried soil layer (DSL), which is intensified by the revegetation from GFGP initiatives. A DSL is the result of soil desiccation in deep soil profiles. The occurrence and expansion of DSLs are strengthened by the high risk of the Loess Plateau to climate change. On the basis of the 14-year data of soil water content (SWC) of four revegetation types on a loessial slope, we investigated the evolution processes and recovery possibility of DSL. Results showed that both variation trends and abrupt changes in the SWC time series were distinctly affected by revegetation. The 40 cm thickness of the DSL was triggered when Medicago saliva and Caragana korshinskii grew for 2 and 4 years, respectively. The downward extension depth of DSL reached 580 cm under the two plants above within 7 and 8 years of planting. However, the results suggested the possibility of DSL disappearance as shown by the formation depth dynamics of DSL, the fluctuation of DSL-SWC, and the phenomenon of sandwiched DSL. During deep moisture recharge and DSL recovery, although the SWC sensitivity to textural variation was present in the vertical profile, the effects of soil texture on SWC were decreased. Wet climate was linked to both DSL thinning and thickening. Thus, the effect of wet climate is bidirectional for DSL development, thereby highlighting the important role of revegetation. The results of this work enhance our understanding of DSL and may help alleviate the risk of drought in the Loess Plateau.
机译：中国黄土高原对全球气候变化的影响的程度部分取决于绿色计划（GFGP）的粮食成就。该地区容易发生干旱问题，尤其是普遍的干旱土壤层（DSL）的创造，这是由GFGP倡议的再培训加剧。 DSL是深土壤剖面中土壤干燥的结果。黄土高原对气候变化的高风险加强了DSL的发生和扩展。在十五坡上的四种植物含量（SWC）的14年的土壤含水量（SWC）的基础上，我们调查了DSL的进化过程和恢复可能性。结果表明，SWC时间序列中的变化趋势和突然变化明显受重新植被影响。当Medicago Saliva和Caragana Korshinskii分别增长2和4年时，将触发40厘米的DSL厚度。在7至8年内的两种植物中，DSL的向下延伸深度达到580厘米，在7至8年内种植。然而，结果表明DSL消失的可能性如DSL的形成深度动态所示，DSL-SWC的波动以及夹心DSL的现象。在深度水分补充和DSL恢复过程中，虽然SWC对纹理变化的敏感性存在于垂直型材中，但土壤质地对SWC的影响降低。湿气候与DSL稀疏和增厚有关。因此，湿气候的影响是DSL开发的双向，从而突出了再培训的重要作用。这项工作的结果提高了我们对DSL的理解，并可能够帮助减轻黄土高原干旱的风险。

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