戴云山黄山松幼苗更新与土壤有机碳空间异质性的关系  

Relationship between the spatial heterogeneity of soil organic carbon and Pinus taiwanensis regeneration seedlings

作　　者：苏松锦[1,2] 刘金福[1,3,4] 马瑞丰[1] 洪伟[1,3,4] 陈志芳[1] 刘伟[1] 祁丽霞[1] 

机构地区：[1]福建农林大学,福州350002 [2]福建三明林业学校,三明365001 [3]福建省高校生态与资源统计重点实验室,福州350002 [4]福建农林大学海峡自然保护区研究中心,福州350002

出　　处：《应用与环境生物学报》2014年第6期986-991,共6页Chinese Journal of Applied and Environmental Biology

基　　金：福建省自然科学基金项目(2014J01380);教育部博士点基金项目(200803890011)资助~~

摘　　要：为提高碳储量估算精度,探讨土壤有机碳空间异质性对黄山松更新苗的影响,采用地统计学方法分析土壤有机碳的空间变异特征与格局.结果表明:戴云山黄山松林Ⅰ层(0-20 cm)、Ⅱ层(20-40 cm)和全剖面的变异系数分别为45.69%、65.82%和47.73%,均属于中等变异;最佳理论模型依次为指数模型、球状模型和高斯模型;均具有强烈空间自相关性,由结构性因素引起的空间异质性比例分别为11.03%、0.20%和12.90%;有效变程分别为18.60 m、18.10 m和14.55 m.黄山松林土壤有机碳密度各向异性明显,空间自相关范围(Moran’s I)总体随空间距离增加而呈减弱趋势;分形维数值:全剖面(1.940)>Ⅰ层(1.927)>Ⅱ层(1.917),与半方差函数块基比参数反映的规律相一致.从空间分布特征看,黄山松林Ⅰ层、Ⅱ层和全剖面土壤有机碳密度均呈明显的带状和斑块状镶嵌分布,且斑块的形状、大小差异显著.黄山松更新苗主要分布于特定土壤有机碳密度斑块中,而在最大值和最小值斑块中分布极少.因此,对黄山松林进行近自然林经营时,应考虑其土壤有机碳的丰缺情况以及空间异质性对黄山松更新苗的制约作用.In order to improve the accuracy of carbon reserves estimation and to explore the impact of soil organic carbon spatial heterogeneity to the Pinus taiwanensis seedlings, the spatial variability and patterns of soil organic carbon was investigated based on the geostatistic method in the P. taiwanensis forest of Daiyun Mountain National Nature Reserve. The results showed that at the layer I （0-20 cm）, layer II （20-40 cm） and whole profile （0-40 cm） layer, 1） the soil organic carbon variation coefficients were 45.69%, 65.82%, and 47.73% respectively, indicating a moderate variability; 2） the optimum semi-variance models of soil organic carbon were exponential, spherical and gaussian, respectively; 3） the proportions of spatial variability of soil organic carbon caused by structural factors were 89.97%, 99.8%, and 87.1%, respectively, exhibiting high spatial autocorrelation; 4） the effective ranges of soil organic carbon were 18.60 m, 18.10 m, and 14.55 m, respectively. In terms of the spatial distribution feature, soil organic carbon exhibited a mosaic distribution with zones and patches. The soil organic carbon was anisotropic in the P. taiwanensis forest. Its spatial autocorrelation range decreased with the spatial distance. The fractal dimensions ranked from high to low as whole profile （1.940） 〉 layer I （1.927） 〉 layerll（1.917）, which was consistent with the rule of Co / Sill. The P. taiwanensis regeneration seedlings mainly distributed at the patches of medium soil organic carbon density of 6.78-13.19 kg/m2, 5.43-7.59 kg/m2 and 1.89-4.85 kg/ m：, few at the patches of minimum or maximum soil organic carbon density, whether at the layer of whole profile, layer I or layer II. Therefore, it is necessary to consider the abundance or absence and constraint effect of the spatial heterogeneity of soil organic carbon to the P. taiwanensis regeneration seedlings when conducting the intimate natural management practice.

关 键 词：空间变异性 半方差函数 KRIGING插值 空间自相关 黄山松 幼苗更新 土壤有机碳 戴云山 

分 类 号：S714.2[农业科学—林学]