土壤粒级空间分布及其与土壤养分的关系

王新中; 刘国顺; 张正杨; 刘清华; 王振海

doi:10.3969/j.issn.1007-5119.2011.05.011

土壤粒级空间分布及其与土壤养分的关系

Spatial Distribution of Soil Particle Composition and its Relationship with Soil Nutrients in Tobacco Planting Soils

摘要

摘要: 运用地统计和GIS 技术研究了土壤粒级的空间变异规律，绘制了空间分布图，进一步分析了土壤粒级和主要土壤养分之间的关系。结果表明，土壤粉粒(0.002~0.02 mm)的半方差函数符合指数模型，表现为中等强度的空间相关性，粘粒(<0.002 mm)和砂粒(0.02~2 mm)的半方差函数符合球状模型，表现出强烈的空间相关性，空间相关距离分别达到435， 609 和657 m。Kringing 插值图直观地描述了不同粒径颗粒的空间分布特征，三者均呈现较明显的渐变性分布规律。除碱解氮外，土壤有机质、全氮、速效磷、速效钾均与粘粒含量呈极显著正相关(P<0.01)，与砂粒含量呈极显著负相关(P<0.01)。土壤粒级可以作为土壤管理分区划分的一项重要依据。

Abstract: Spatial variability of soil particle composition was measured by use of geostatistics and GIS techniques for an 87 ha tobacco field with 100 m sampling interval in Chahe, Jia County, Henan Province. The spatial distribution of soil particle and its relationship with soil nutrients were analyzed. The results showed that the semivariogram for soil silt (0.02-0.002 mm) was well fitted by exponential model with medium spatial correlation, while soil clay (<0.002 mm) and sand (0.02-2 mm) by spherical models with medium spatial correlation. The spatial correlation distance for soil silt, clay and sand were 435, 609 and 657 m, respectively. The spatial distribution pattern of soil particle composition was intuitively characterized by kriging interpolation. Soil organic matter, total nitrogen, available phosphorous and available potassium were significantly positively correlated with soil clay content (P<0.01), but negatively correlated with soil sand content (P<0.01). Soil particle composition could be considered as an important index for regionalizing soil management zones

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