森林类型对土壤表层有机碳空间异质性的影响  

Influence of Subtropical Forest Ecosystems Types on Spatial Heterogeneity of Surface Soil Organic Carbon

作　　者：赵安玖[1] 胡庭兴[1] 陈小红[1] 

机构地区：[1]四川农业大学生态林业工程重点实验室

出　　处：《自然资源学报》2009年第10期1748-1756,共9页Journal of Natural Resources

基　　金：国家自然科学基金(30471378);四川省重点学科建设项目(SZD04l9)

摘　　要：对西南山地阔叶林区的天然阔叶混交林、天然次生林和人工柳杉林的土壤表层有机碳(SSOC)进行了测定,并用地统计学理论构建了3种亚热带森林生态系统在小尺度上的SSOC半方差理论模型。结果表明,不同森林生态系统间SSOC含量差异性显著,表现为天然阔叶混交林>天然次生林>人工柳杉林,SSOC含量与土壤含水率、容重、孔隙度和有机质相关性显著;天然阔叶混交林的SSOC空间相关性最强,次生林次之,人工林较弱;天然阔叶混交林SSOC在45°方向上空间变异最明显,天然次生林和人工林在各个方向上的变异均较弱;天然阔叶混交林SSOC的等值线较密,梯度变化急剧,天然次生林次之,人工林等值线稀疏,梯度变化不明显。这表明不同森林类型对SSOC含量和分布有着重要影响。To study the variation pattern and the spatial heterogeneity of surface soil organic carbon（SSOC） of different subtropitical forest ecosystems in fine scale, SSOC content of three subtropical forest ecosystems such as natural broad-leaved mixed forest, natural secondary forest and Cryptomeria fortunei plantation were measured, theoretic semivariance models of SSOC were established by geostatistics method. The conclusion showed that the difference among SSOC content of three forest ecosystems was significant, the content of natural broad-leaved mixed forest was higher, and the content of plantation is lowest. SSOC content was correlated significantly with the soil water content, soil bulk density, soil porosity and soil organic matter. SSOC content of three forest ecosystems had strong spatial heterogeneity at different aspects. Because of light-temperature factors and landform, there were obvious spatial correlation among SSOC of different forest ecosystems, the correlation was the strongest in natural broad-leaved mixed forest, and the correlation in plantation forest appeared weak. Spatial variability of SSOC content in natural broad-leaved mixed forest was most obvious in 45° direction （direct solar direction）, natural secondary forest and Cryptomeria fortunei plantation were weaker in all directions, human disturbance such as hags, grazes, crops decreased the spatial variability, and made it uniformity. Distribution maps of SSOC of different forest ecosystems were drawn by Kriging interpolation, SSOC of natural broad-leaved mixed forest occurred as block distribution and zonal distribution in the northwest direction along the slope, and the isoline was thicker which showed SSOC content varied rapidly, SSOC of natural secondary forest and Cryptomeriafortunei plantation occurred as zonal distribution in the northeastsouthwest direction, the isoline of plantation was the sparsest which showed that SSOC contents had no significant change. In a word, forest ecosystems had an important impact on the conten

关 键 词：土壤表层有机碳 半方差函数 KRIGING插值 空间异质性 

分 类 号：S714[农业科学—林学]