区域土壤质地层次三维空间分布的地统计模拟方法比较
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国家重点基础研究发展规划项目(2009CB118607)、国家自然科学基金项目(40401025)和教育部新世纪优秀人才支持计划项目(NCET-07-0809)资助。


Applicability comparison of two geostatistical methods on three dimensional simulation of soil textural layers at regional scale
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    摘要:

    为了定量化描述冲积平原区土壤剖面质地层次的复杂变异性,本研究根据华北冲积平原一块面积约15 km2区域内的139个土壤剖面(0 ~ 2 m)观测数据,分别应用顺序指示模拟和多点地统计学模拟方法分析了区域内土壤质地层次的三维空间分布特征。前者的结果显示土壤质地层在水平方向上的分布具有很强的随机特性,而后者的结果表明土壤质地层在水平方向上的分布具有一定的规律性。将转移概率函数得到的各向同性分布比例和各向异性平均长度(厚度)用来生成三维训练图像,然后将生成的训练图像用于多点地统计学模拟,并与传统的顺序指示模拟结果进行了对比。结果表明,多点地统计学模拟在估计精度以及垂直方向上土壤质地层次连贯性的再现性上优于传统顺序指示模拟,所得结果能更好地反映土壤质地层次的空间分布特征。

    Abstract:

    In order to describe quantitatively the highly spatial variability of soil profiles in falluvial soil, based on 139 observed soil profiles in a 15 km2 region in North China Plain, indicator variogram and transiogram were used to analyze the spatial variability of five soil textural layers respectively. Results of indicator variograms showed that the soil textural layers in horizontal direction had strong stochastic character whereas the results of transiogram showed that the soil textural layers in horizontal direction had a certain degree of regularity. Indicator variogram model was used in Sequential Indicator Simulation (SIS). Three dimensional training image was created by using isotropy distribution proportion and anisotropy mean lengths obtained from transiogram, and then, the training image was used as input to multiple-point geostatistics simulation (MPS). The simulation results were validated and compared with traditional SIS method. Results showed that the MPS method is better than SIS method both in prediction accuracy and reproduction of connectivity of soil textural layers in vertical direction. The results, therefore, can better reflect the spatial character of soil textural layers.

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贺 勇,胡克林,李保国,黄元仿,Deli Chen.区域土壤质地层次三维空间分布的地统计模拟方法比较[J].土壤,2010,42(3):429-437. HE Yong, HU Ke-lin, LI Bao-guo, HUANG Yuan-fang, CHEN De-li. Applicability comparison of two geostatistical methods on three dimensional simulation of soil textural layers at regional scale[J]. Soils,2010,42(3):429-437

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