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首页> 外文会议>2010 International conference of international conference on combating land degradation in agricultral areas. >Spatio-Temporal Variations of Topsoil Moisture and Its Controlling Factors in a Semi-Arid Steppe of Inner Mongolia, China
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Spatio-Temporal Variations of Topsoil Moisture and Its Controlling Factors in a Semi-Arid Steppe of Inner Mongolia, China

机译：内蒙古半干旱草原表层土壤水分的时空变化及其控制因素

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摘要

This study evaluated the relative importance of soil, vegetation, topography and grazing in controlling the variations of soil moisture in a grazed semi-arid steppe of Inner Mongolia, Northern China. Five fields with different sheep grazing levels were investigated at high spatial and temporal resolution during 2004-2006: (1) ungrazed since 1979 (UG 79); (2) ungrazed since 1999 (UG 99); (3) winter grazed only, with 0.5 sheep units (ewe and lamb) ha-1 yr-1 (WG); (4) continuously grazed, with 1.2 sheep units ha-1 yr-1 (CG); and (5) heavily grazed, with 2.0 sheep units ha-1 yr-1 (HG). Results showed that spatial variance increased with mcreasing mean soil moisture content. Soil water content was greatest in UG 99, followed by UG 79, WG and CG, and smallest in HG, indicating that grazing decreased soil water regimes. With increasing grazing intensity, spatial heterogeneity of soil moisture decreased. These treatment-specific results were highly associated with grazing-induced changes on soil and plant properties, as these properties were found to be main factors controlling the variation of soil moisture. Our results have implications for the understanding the eco-hydrological processes of semi-arid steppe ecosystems. We suggest that pasture management strongly modified soil moisture patterns, which should be considered in the ecological monitoring and assessment.
机译：这项研究评估了土壤，植被，地形和放牧在控制中国北方内蒙古半干旱草原放牧土壤水分变化中的相对重要性。在2004-2006年期间，以高时空分辨率研究了五个不同放牧水平的田地：（1）自1979年以来未软化（UG 79）； （2）自1999年（UG 99）以来一直保持脱毛状态； （3）仅放牧的冬季，每头绵羊（母羊和羔羊）的ha-1 yr-1（WG）为0.5； （4）以1.2个绵羊单位ha-1 yr-1（CG）连续放牧； （5）重度放牧，有2.0个绵羊单位ha-1 yr-1（HG）。结果表明，空间变异随着平均土壤含水量的增加而增加。 UG 99的土壤含水量最大，其次是UG 79，WG和CG，而HG最小，表明放牧降低了土壤水分状况。随着放牧强度的增加，土壤水分的空间异质性降低。这些特定处理的结果与放牧引起的土壤和植物特性的变化高度相关，因为发现这些特性是控制土壤水分变化的主要因素。我们的结果对理解半干旱草原生态系统的生态水文学过程具有启示意义。我们建议，牧场管理强烈改变了土壤水分的格局，这在生态监测和评估中应予以考虑。

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