中亚热带南酸枣落叶阔叶林土壤磷素空间变异及其影响因素  

Spatial heterogeneity and influencing factors of soil phosphorus concentration in a mid-subtropical Choerospondias axillaris deciduous broad-leaved forest,China

作　　者：胡瑞彬[1] 方晰[1,2,3] 项文化[1,2,3] 蒋芳[1] 雷丕锋[1,2,3] 赵丽娟[1,2] 朱文娟[1] 邓湘雯[1,2,3] 

机构地区：[1]中南林业科技大学生命科学与技术学院,长沙410004 [2]南方林业生态应用技术国家工程实验室,长沙410004 [3]湖南会同杉木林生态系统国家野外科学观测研究站,湖南会同438107

出　　处：《应用生态学报》2016年第3期705-715,共11页Chinese Journal of Applied Ecology

基　　金：国家林业公益性行业科研专项项目(201304317);科技部国际合作项目(2013DFA32190);教育部高等学校博士学科点专项科研基金项目(20124321110006)资助~~

摘　　要：在湖南省长沙县大山冲国有林场南酸枣落叶阔叶林建立1 hm2固定样地,基于植物群落学调查数据和等距离网格布点取样的土壤养分测定数据,采用地统计学和GIS相结合的方法,研究土壤P含量的空间变异特征及其影响因子.结果表明：腐殖质层及0~10、10~20、20~30 cm土层的全P、有效P含量的均为中等强度变异,同一土层有效P含量的变异程度较全P含量高,随着土壤深度增加,全P、有效P含量下降,变异程度增大.土壤全P、有效P含量具有较高的空间自相关性,主要受结构性因素影响.有效P含量的空间异质性较全P强,各土层全P、有效P含量空间自相关范围分别为92.80~168.90 m、79.43~106.20 m.同一土层全P含量分维数高于有效P,空间格局较有效P复杂,有效P含量空间依赖性更强,具有更好的结构性.腐殖质层及0~10、10~20、20~30 cm土层的全P、有效P含量呈现条带状和斑块状梯度性分布,且全P、有效P含量的空间变化趋势基本一致,高值出现在洼地,低值则出现在山脊.全P、有效P含量与高程、地表凋落物现存量呈显著负相关,与凹凸度、树种种数、株数、土壤p H相关性不显著,与土壤有机C、全N含量呈显著正相关.这反映出土壤P的淋溶特性,其空间变异性受到多种因子相互作用的影响.In order to investigate spatial variations in soil phosphorus（ P） concentration and the influencing factors,one permanent plot of 1 hm2 was established and stand structure was surveyed in Choerospondias axillaries deciduous broadleaved forest in Dashanchong Forest Park in Changsha County,Hunan Province,China. Soil samples were collected with equidistant grid point sampling method and soil P concentration and its spatial variation were analyzed by using geo-statistics and geographical information system（ GIS） techniques. The results showed that the variations of total P and available P concentrations in humus layer and in the soil profile at depth of 0-10,10-20 and 20-30 cm were moderate and the available P showed higher variability in a specific soil layer compared with total P. Concentrations of total P and available P in soil decreased,while the variations increased with the increase in soil depth. The total P and available P showed high spatial autocorrelation,primarily resulted from the structural factors. The spatial heterogeneity of available P was stronger than that of total P,and the spatial autocorrelation ranges of total P and available P varied from 92.80 to 168.90 m and from 79. 43 to 106. 20 m in different soil layers,respectively. At the same soil depth,fractal dimensions of total P were higher than that of available P,with more complex spatial pattern,while available P showed stronger spatial correlation with stronger spatial structure. In humus layer and soil depths of 0-10,10-20 and 20-30 cm,the spatial variation pattern of total P and available P concentrations showed an apparent belt-shaped and spot massive gradient change. The high value appeared at low elevation and valley position,and the low value appeared in the high elevation and ridge area. The total P and available P concentrations showed significantly negative correlation with elevation and litter,but the relationship with convexity,species,numbers and soil p H was not significant. The total P and available P exhibited signific

关 键 词：南酸枣落叶阔叶林 土壤磷 空间异质性 地统计学 GIS技术 

分 类 号：S714.2[农业科学—林学]