Spatial variability of soil properties affected by grazing intensity in Inner Mongolia grassland
Spatial variability of soil properties affected by grazing intensity in Inner Mongolia grassland
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DOI：
10.1016/j.ecolmodel.2007.02.019
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发表时间：
2007-07-10
影响因子：
3.1
通讯作者：
Peng, Xinhua
中科院分区：
文献类型：
--
作者：
Zhao, Ying;Peth, Stephan;Peng, Xinhua
土壤特性的空间变异性分析对于解释特定地点的生态系统非常重要，不仅对于过程调查而且对于模型升级也很重要。本文旨在研究内蒙古锡林河流域羊草草原放牧强度对土壤物理力学性质的影响及其相互作用。调查地点实行五种放牧强度（1979年以来未放牧、1999年以来未放牧、冬季放牧、连续放牧和重度放牧）。 2004-2005年期间，在表层土壤上以15 In采样距离网格测量土壤含水量（SWC）、导水率（K）、水滴渗透时间（WDPT）、剪切强度（SS）、土壤有机碳（SOC）浓度、容重（BD）和土壤质地。使用描述性统计和地质统计学对数据进行分析。采用Pearson相关、偏相关、多元回归分析等方法分析土壤性质之间的相关性和交互作用。结果表明，土壤性质的空间分布可以用球形或指数模型很好地描述。 WDPT 的空间依赖性范围最高，SS 的空间依赖性范围最低。放牧降低了 SWC、SOC 和 WDPT，但增加了 BD 和 SS。多元回归分析显示SWC、K、WDPT、SOC和BD之间存在显着相关性；以及 SS 和淤泥含量之间的关系。羊群践踏引起的土壤压实，特别是在重度放牧的地方，倾向于使土壤性质的空间分布均匀，这可能会增加土壤对水和养分流失的脆弱性，从而减少植物可用水量，从而减少草地生产力。 (c) 2007 Elsevier B.V. 保留所有权利。
Analysis of the spatial variability of soil properties is important to interpret the site-specific ecosystems not only with respect to process investigations but also to model upscaling. This paper aims to study the effects of the grazing intensity on soil physical and mechanical properties and their interactions in a Leymus chinensis steppe of the Xilin River Basin, Inner Mongolia, China. The investigated sites were subjected to five grazing intensities (ungrazed since 1979, ungrazed since 1999, winter grazing, continuous grazing and heavy grazing). Soil water content (SWC), hydraulic conductivity (K), water drop penetration time (WDPT), shear strength (SS), soil organic carbon (SOC) concentration, bulk density (BD), and soil texture were measured at a grid with 15 In sampling distance on the surface soil during the period of 2004-2005. The data were analyzed using descriptive statistics and geostatistics. The correlation and interaction between soil properties were analyzed by the methods of Pearson correlation, partial correlation and multiple regression analysis. The results showed that spatial distributions of soil properties could be well described by spherical or exponential models. The ranges of spatial dependence were the highest for WDPT and the lowest for SS. Grazing decreased SWC, SOC and WDPT but increased BD and SS. Multiple regression analysis showed significant correlations among SWC, K, WDPT, SOC and BD; as well as between SS and silt content. Soil compaction induced by sheep trampling, especially in the heavily grazed site, inclined to a homogenous spatial distribution of soil properties, which will possibly enhance soil vulnerability to water and nutrient loss, and consequently reduce the plant available water and thus grassland productivity. (c) 2007 Elsevier B.V. All rights reserved.