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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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基于地学信息的土壤属性高精度曲面建模
DOI: 10.11821/xb201111013, PP. 1574-1581
Keywords: 高精度曲面建模,空间插值,精度,地统计学,土壤属性,南方红壤丘陵区
Abstract:
目前土壤属性的曲面建模面临两大问题,一是缺乏足够多的采样点进行模拟,二是采样点的土壤属性与环境变量间存在非线性关系。高精度曲面建模(HASM)方法在如何融合地学信息对土壤属性进行空间插值,尚需深入研究。本文提出高精度曲面建模与地学信息相结合的土壤属性空间插值方法(Highaccuracysurfacemodelingforsoilproperties,HASM-SP),分别基于研究区的土壤类型、土地利用类型和母岩类型,模拟了江西省典型红壤丘陵区土壤的速效磷(AP)、锂(Li)、pH、碱解氮(AN)、全钾(K)和铬(Cr)6种土壤属性的空间分布。将HASM-SP与普通克立格(OK)、OK与地学信息相结合的方法(OK-Geo)和分层克立格(SK)相对比,结果表明结合地学信息可以使插值方法(HASM-SP和OK-Geo)模拟结果的平均误差更趋近于0；相对于其他3种方法,HASM-SP具有较小的平均绝对误差和均方根误差。从模拟的空间分布图上来看,HASM-SP获得了由于地学要素类型突变导致的土壤属性空间变异的细节信息。因此,基于地学信息的土壤属性高精度曲面建模方法(HASM-SP)与传统插值方法相比,不仅提高了土壤属性空间分布的模拟精度,还能更好地刻画突变边界处土壤属性的空间变异,使土壤属性分布图更好地符合地学规律和实际情况。HASM-SP的提出对于丰富土壤属性的高精度曲面建模理论具有重要意义,并为土壤管理、精准农业的实施以及区域环境规划等提供科学依据。
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