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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Investigation of Factors Controlling the Regional-Scale Distribution of Dried Soil Layers Under Forestland on the Loess Plateau, China
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Investigation of Factors Controlling the Regional-Scale Distribution of Dried Soil Layers Under Forestland on the Loess Plateau, China

机译：黄土高原林地下干土壤层区域尺度分布控制因素研究

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摘要

The effects of drought on plants have been extensively documented in water-limited systems. However, its effects on soil are seldom considered because of the lack of comparative data on profile soil water content (SWC). A dried soil layer (DSL) within the soil profile is a typical indication of soil drought caused by climate change and/or ill-advised human practices. The regional spatial variability, dominant factors, and predictive models of DSL under forestland were explored in the present study. SWC at 0-600 cm of 125 pre-selected sites across the entire Loess Plateau was measured, and then two evaluation indices of DSL (the thickness of DSL, DSLT; SWC within the DSL, DSL-SWC) were calculated. The corresponding soil, topography, plant, and meteorology factors (a total of 28 variables) for each site were also measured. Most of the forestlands across the Plateau had DSL formation within the soil profile (102 of 125 study sites). The DSL levels were considered to be serious, with DSLT generally exceeding 300 cm with a mean DSL-SWC of only 7.9% (field capacity (FC) = 18.1%). DSLT and DSL-SWC indicated a moderate and strong spatial dependence with ranges of 69 and 513 km, respectively. Thicker DSLs were mainly distributed in the center of the Plateau, whereas thinner DSLs were observed in the southern and southeastern parts. In contrast, DSL-SWC distributions demonstrated an obvious decreasing trend from the southeast to the northwest. Dominant factors affecting DSLT under forestlands were FC, bulk density, slope gradient, slope aspect, and capillary water content; while dominant factors for DSL-SWC were FC, aridity, sand content, altitude, vegetation coverage, and evaporation. Moreover, predictive models developed by multiple regressions were relatively accurate when predicting DSLs, especially DSL-SWC. Understanding these associations with DSLs formation in forestland is helpful for efficient water resource management, silviculture, and eco-environment restoration on the Loess Plateau and in other water-limited regions around the world.
机译：在限水系统中已广泛记录干旱对植物的影响。然而，由于缺乏有关剖面土壤含水量（SWC）的比较数据，很少考虑其对土壤的影响。土壤剖面内的干燥土壤层（DSL）是气候变化和/或不良做法引起的土壤干旱的典型指示。本研究探讨了林地下DSL的区域空间变异性，主导因素和预测模型。测量整个黄土高原125个预选站点的0-600 cm处的SWC，然后计算DSL的两个评估指标（DSL的厚度，DSLT; DSL内的SWC，DSL-SWC）。还测量了每个地点的相应土壤，地形，植物和气象因素（总共28个变量）。整个高原地区的大部分林地都在土壤剖面内形成了DSL（125个研究地点中的102个）。 DSL级别被认为是严重的，DSLT通常超过300 cm，平均DSL-SWC仅为7.9％（现场容量（FC）= 18.1％）。 DSLT和DSL-SWC分别显示了适度和强烈的空间依赖性，范围分别为69 km和513 km。较厚的DSL主要分布在高原中心，而较薄的DSL则分布在南部和东南部。相反，DSL-SWC分布显示出从东南到西北的明显下降趋势。影响林下DSLT的主要因素是FC，堆密度，坡度梯度，坡度和毛细水含量。而DSL-SWC的主要因素是FC，干旱，沙含量，高度，植被覆盖和蒸发。此外，在预测DSL（尤其是DSL-SWC）时，通过多元回归开发的预测模型相对准确。了解这些与林地中DSL形成的联系有助于黄土高原和世界其他缺水地区的高效水资源管理，造林和生态环境恢复。

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