基于最大似然法与矩法的黄土高原小流域土壤碳氮空间变异分析
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江苏省教育厅高校自然科学项目"基于GIS的骆马湖生态安全预警系统及评价应用研究"(13KJB610015)


Analysis on Spatial Variability of Soil Organic Carbon and Nitrogen Based on REML and MOM in a Small Watershed on Loess Plateau
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    摘要:

    以黄土高原寺底沟小流域为研究对象,根据不同土地利用方式采集46个样点的土壤样品,通过地统计方法对土壤有机碳和全氮的空间变异特征进行了分析。采用受限最大似然法(REML)和矩法(MOM)两种方法分别对变异函数进行了估计,通过交叉检验选择克里金预测效果较好的变异函数进行地统计插值。(1) 与矩法(MOM)相比,在多数情况下受限最大似然法(REML)估计的变异函数进行克里金插值更加准确。(2) 土层深度对土壤全氮空间变异影响较小,对土壤有机碳影响较大,表层土壤有机碳含量及变异程度明显高于下层土壤。(3) 土地利用方式对土壤有机碳和全氮的空间分布有重要影响,灌木林和天然草地土壤有机碳和全氮水平最高,弃耕地其次,梯田、果园、人工草地最低,表明退耕还林对提高土壤碳氮水平有重要贡献。

    Abstract:

    Based on geostatistics, spatial variability of soil organic carbon(SOC) and total nitrogen(TN) in Sidigou watershed on the Loess Plateau were analyzed. 46 sampling sites were collected in the watershed according to different land uses and different positions along the slope transect. The variogram was estimated by residual maximum likelihood(REML) and the method of moments(MOM). The Kriging method with the better variogram was selected by cross-validation method to conduct the geostatistics interpolation. The results showed that:(1) The variogram by REML is almostly more accurate for Kriging method than that by MOM.(2) Soil depth affected the spatial variation of SOC content more greatly than that of TN content. SOC content and its variation in surface soil were significantly higher than that in the lower soil layer.(3) The SOC and TN distribution was significantly affected by land use. SOC and TN content of shrubland and natural grassland was significantly higher than that of other land use types, and SOC and TN content for derelict land took the second place, then, it for derelict land, orchard and artificial grassland took the lowest level. This result indicated that grain for green project in small watershed of the Loess Plateau had an important contribution on the SOC and TN sequestration.

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方炫,安韶山,薛志婧,李壁成.基于最大似然法与矩法的黄土高原小流域土壤碳氮空间变异分析[J].水土保持通报,2014,(4):141-146

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  • 收稿日期:2013-08-17
  • 最后修改日期:2013-09-12
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  • 在线发布日期: 2016-04-05
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