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首页> 外文期刊>Biogeochemistry >Soil Properties and their Spatial Pattern in a Degraded Sandy Grassland under Post-grazing Restoration, Inner Mongolia, Northern China
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Soil Properties and their Spatial Pattern in a Degraded Sandy Grassland under Post-grazing Restoration, Inner Mongolia, Northern China

机译：内蒙古草地退化后草地退化后土壤性质及其空间格局

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摘要

In this study, we use classical and geostatistical methods to identify characteristics of some selected soil properties including soil particle size distribution, soil organic carbon, total nitrogen, pH and electrical conductivity and their spatial variation in a 5-year recovery degraded sandy grassland after two different grazing intensity disturbance: post-heavy-grazing restoration grassland (HGR) and post-moderately grazing restoration grassland (MGR), respectively, in Horqin steppe, Inner Mongolia, northern China. The objective was to examine effect of grazing intensity on spatial heterogeneity of soil properties. One hundred soil samples were taken from the soil layer 0–15 cm in depth of a grid of 10 m×10 m under each treatment. The results showed that soil fine fractions (very fine sand, 0.1–0.05 mm and silt + clay, <0.05 mm), soil organic carbon and total nitrogen concentrations were significant lower and their coefficients of variation significant higher under the HGR than under the MGR. Geostatistical analysis of soil heterogeneity revealed that soil particle size fractions, organic carbon and total nitrogen showed different degree of spatial dependence with exponential or spherical semivariograms on the scale measured under HGR and MGR. The spatial structured variance account for a large proportion of the sample variance in HGR plot ranging from 88% to 97% for soil particle fractions, organic C and total N, however, except for organic C (88.8%), the structured variance only account for 50% of the sample variance for soil particle fractions and total N in the MGR plot. The ranges of spatial autocorrelation for coarse-fine sand, very fine sand, silt + clay, organic C and total N were 13.7 m, 15.8 m, 15.2 m, 22.2 m and 21.9 m in HGR plot, respectively, and was smaller than in MGR plot with the corresponding distance of 350 m, 144.6 m, 45.7 m, 27.3 m and 30.3 m, respectively. This suggested that overgrazing resulted in an increase in soil heterogeneity. Soil organic C and total N were associated closely with soil particle fractions, and the kriging-interpolated maps showed that the spatial distribution of soil organic C and total N corresponded to the distribution patterns of soil particle fractions, indicating that high degree of spatial heterogeneity in soil properties was linked to the distribution of vegetative and bare sand patches. The results suggested that the degree of soil heterogeneity at field scale can be used as an index for indicating the extent of grassland desertification. Also, the changes in soil heterogeneity may in turn influence vegetative succession and restoration process of degraded sandy grassland ecosystem.
机译：在这项研究中，我们使用经典方法和地统计学方法来确定一些选定的土壤特性的特征，包括土壤粒径分布，土壤有机碳，总氮，pH和电导率，以及经过5年恢复退化的沙质草地两次接触后的空间变化。不同的放牧强度干扰：内蒙古科尔沁草原的重度放牧后恢复草地（HGR）和中度放牧后恢复草地（MGR）。目的是研究放牧强度对土壤特性空间异质性的影响。在每种处理下，从深度为0–15 cm的土壤层（10 m×10 m的网格）中采集100个土壤样品。结果表明，在HGR下，土壤细粒级分（非常细的沙，0.1-0.05 mm，淤泥+粘土，<0.05 mm），土壤有机碳和总氮浓度均显着较低，其变异系数显着高于MGR。 。对土壤异质性的地统计学分析表明，在HGR和MGR下测得的尺度上，土壤粒径分数，有机碳和总氮表现出不同程度的空间依赖性，呈指数或球形半变异函数。对于土壤颗粒部分，有机碳和总氮，空间结构化方差占HGR图中样本方差的很大一部分，范围从88％到97％，但是，除了有机碳（88.8％）外，结构方差仅占MGR图中土壤颗粒分数和总氮的样本差异的50％。 HGR图中粗细砂，极细砂，粉砂土，有机碳和总氮的空间自相关范围分别为13.7 m，15.8 m，15.2 m，22.2 m和21.9 m，小于MGR曲线分别对应的距离为350 m，144.6 m，45.7 m，27.3 m和30.3 m。这表明过度放牧导致土壤异质性增加。土壤有机碳和总氮与土壤颗粒组分密切相关，kriging插值图表明，土壤有机碳和总氮的空间分布与土壤颗粒组分的分布模式相对应，表明土壤有机质和土壤氮的高度异质性。土壤特性与营养和裸露沙斑的分布有关。结果表明，田间尺度的土壤异质程度可以作为指示草地荒漠化程度的指标。同样，土壤异质性的变化可能反过来影响退化的沙质草地生态系统的营养演替和恢复过程。

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  • 来源
    《Biogeochemistry》 |2006年第3期|297-314|共18页
  • 作者

    Yong Zhong Su; Yu Lin Li; Ha Lin Zhao;

  • 作者单位

    Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of SciencesLinze Inland River Basin Comprehensive Research Station Chinese Ecological Ecosystem Research Network;

    Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences;

    Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Degraded sandy grassland; Grazing; Restoration; Soil properties; Spatial heterogeneity Semivariograms;

    机译：退化沙质草地;放牧;恢复;土壤性质;空间异质性半变异函数;

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