闽西竹林土壤物理性质的空间变异格局

发布时间：2018-05-04 10:15

本文选题：毛竹 + 土壤物理性质　；参考：《东北林业大学学报》2017年08期

【摘要】：采用地统计学与GIS分析方法,分析闽西永安市6个乡镇的毛竹林地的土壤含水量、土壤密度、最大持水量、最小持水量和土壤总孔隙度等6个物理性质的空间变异规律与分布格局。6个土壤物理指标变异系数介于0.12~0.30,均属中等变异;土壤含水量、最大持水量和毛管持水量最佳半方差函数模型均为球状模型,变程依次为3 970、4 360、4 710 m,土壤密度、最小持水量和毛管总孔隙度最佳半方差函数模型均为指数模型,变程分别为5 490、5 310、6 690 m,均大于1 000 m采样距离,且各指标随机性变异占总变异比例低于25%,分形维数趋近2,均呈现强空间相关性;除土壤密度呈各向同性且以0°方向(西—东)为优势格局外,其余5个指标呈各向异性且均以45°方向(西南—东北)为优势格局。土壤含水量与土壤密度的分布呈相反趋势,最大持水量、最小持水量和毛管总孔隙度分布格局相似,毛管持水量分布与研究区海拔密切相关,6个物理性质空间变异呈显著相关。
[Abstract]:The soil water content, soil density and maximum water holding capacity of Phyllostachys pubescens forest land in 6 towns of Yongan City, Western Fujian Province, were analyzed by using geostatistics and GIS analysis method. The spatial variation and distribution pattern of six physical properties, such as the minimum water holding capacity and soil total porosity, the coefficient of variation of the six soil physical indexes ranged from 0.12 to 0.30, all of them belonged to moderate variability, and the soil water content, The best semi-variance function model of maximum water holding capacity and capillary water holding capacity is spherical model, and the variation range is 3 970,4360 ~ (60) ~ 4 710 m. The best semi-variance function model of soil density, minimum water holding capacity and total capillary porosity are all exponential models. The range of variation is 5 490 ~ 5 310 ~ 6 690 m, which is more than 1 000 m sampling distance, and the ratio of random variation to total variation is less than 25%, the fractal dimension is close to 2, all of them have strong spatial correlation. Except that the soil density was isotropic and the dominant pattern was 0 掳(west-east), the other five indexes were anisotropic and 45 掳(south-northeast) as dominant pattern. The distribution of soil water content and soil density showed a reverse trend. The distribution pattern of maximum water holding capacity, minimum water holding capacity and total capillary porosity were similar. The distribution of capillary water holding capacity was closely related to the altitude of the study area, and the spatial variation of six physical properties was significantly correlated.
【作者单位】：福建农林大学;
【基金】：福建省科技引导性项目(2016N0003) 林业科技成果国家级推广项目(KH1130006)
【分类号】：S714.2

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