Relationship between the spatial heterogeneity of soil organic carbon and Pinus taiwanensis regeneration seedlings
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) ＞ layerⅡ (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/m2,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.
spatial variabilitysemi-variogramKriging interpolationspatial autocorrelationPinus taiwanensisregeneration of seedlingssoil organic carbonDaiyun Mountain
NETL
NSTL
万方数据
维普
