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| 东莞林地土壤肥力空间异质性分析 |
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沈德才,陈跃洲,周永东,龙田养,朱剑云,叶永昌
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广东省东莞市林业科学研究所,广东省东莞市林业科学研究所,广东省东莞市林业科学研究所,广东省东莞市林业科学研究所,广东省东莞市林业科学研究所,广东省东莞市林业科学研究所
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| 摘要: |
| 应用地统计学结合地理信息系统研究了广东省东莞市森林表层土壤(0～25 cm) 有机质、全氮、全钾、全磷和pH值等5种土壤肥力指标的空间变异规律。研究表明：全磷、全钾、有机质、全氮为中等变异；pH值属于弱变异；全钾、pH值的变异函数曲线的理论模型符合球状模型，有机质、全氮、全磷适用模型为指数模型；全磷、全钾、有机质、pH值具有中等空间相关性，全氮的空间相关性较弱；5种肥力指标的空间自相关范围存在明显差异，变化范围为2 218~19 297 m。用普通克立格法进行最优内插，得各肥力指标含量分布图，并分析了各土壤肥力指标的分布状态。 |
| 关键词: 地统计学 GIS 养分 空间变异 |
| DOI： |
| 分类号:S714.8 |
| 基金项目:广东省东莞市科学技术局项目“东莞森林生态系统碳储量及其碳汇技术研究”（2007108101112） |
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| Spatial Variability of Forest Soil Fertility in Dongguan |
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shendecai,,,, and
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| Abstract: |
| Geostatistics combined with geographic information systems (GIS) was applied to analyze spatial variability of forest soil fertility in top layer (0—25 cm) soil in Dongguan, Guangdong. Soil fertility index in this study included soil organic matter (SOM) , total N, total K, total P and pH value. The results showed that: the total P, total K, SOM, total N is in medium variation and pH is in weak variation；the semivariograms of SOM, total N, total P were best described by exponential model, while total K and pH value were best described spherical model. Soil fertility had moderate spatial correlation except total N, which had weak spatial correlation; their spatial heterogeneity degree was obvious different in the range of 2 218 to 19 297 m. The distributing map of soil fertility were drawn by using ordinary Kriging, and the distributing results of soil fertility were analyzed. The results can be applied in forest ecological construction of Dongguan. |
| Key words: geostatistics GIS soil nutrients spatial variability |
