[Spatial Heterogeneity of Soil Respiration in the Soil Erosion Area of West Mountains in Fujian Province, China].

The spatial heterogeneity of soil respiration () is of great significance in accurately estimating the carbon budget in erosion areas. This study investigated the soil respiration (), total nitrogen (TN), carbon-nitrogen ratio (C/N), soil organic carbon content (SOC), leaf area index (LAI), soil temperature (), and soil moisture () in 59 soil samples collected from Hetian Town in Fujian Province. Both classical statistics and geostatistics were used to analyze the spatial heterogeneity of soil respirations and other measured factors. The variability of and other measured factors in the samples ranked from the largest to the smallest: LAI > SOC > TN > > C/N > > . was positively correlated with (<0.01) and with TN (<0.05), but not significantly correlated with other factors (>0.05); TN, SOC and could be used to explain the spatial variation of soil respiration among the samples. The results from geo-statistical analysis showed that was in a medium spatial autocorrelation, with 52.89% of spatial heterogeneity caused by structural factors and 47.11% of spatial heterogeneity resulted from random factor; the fractal dimensions of soil respiration and its interacted factors were ranked as: > LAI > C/N > > SOC > > TN; the spatial distribution patterns of were similar with those of TN and , but different from those of C/N, SOC or LAI. At the 95% confidence level and 90% estimation accuracy, the reasonable sampling number of was 62.