Topographic Variation of Soil Nitrogen Mineralization and Microbial Biomass in Japanese Cedar (Cryptomeria japonica D. Don) Stands at Myougodani Watershed, Toyama, Japan (Soil Biology)
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The spatial variability of nitrogen (N) mineralization, nitrification, and microbial biomass was investigated using surface soils from various topographic positions at a relatively small watershed with Japanese cedar (Cryptomeria japonica D. Don) plantations. The watershed topography was characterized using a topographic index derived from GIS analysis. The topographic index reasonably reflected the spatial variability of the soil water conditions, total soil carbon (C) and N contents, and exchangeable base concentrations. However, this index was not significantly correlated with the spatial variability of net N mineralization and microbial biomass. Topographic index and soil properties (total soil C and N contents, C/N ratio, exchangeable base concentrations, and clay content) were subjected to principal component analysis to eliminate multiple-collinearity among the variables, and express the variables as new orthogonal variables. Principal component analysis showed that the soil properties could be divided into two groups: PC1 (soil nutrient pools) and PC2 (soil clay content). The topographic index was closely correlated with PC1 and not significantly correlated with PC2. Regression of PC scores on net N mineralization and microbial biomass indicated the relatively high contribution of PC2 to the variability in N mineralization and microbial biomass. This result suggested that not only topographic factors but also the clay content exerted an important influence on the spatial pattern of N mineralization and microbial biomass within a watershed with single species forests.
- 一般社団法人日本土壌肥料学会の論文
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関連論文
- Topographic Variation of Soil Nitrogen Mineralization and Microbial Biomass in Japanese Cedar (Cryptomeria japonica D. Don) Stands at Myougodani Watershed, Toyama, Japan (Soil Biology)
- Regional estimation of Japanese cedar (Cryptomeria japonica D. Don) productivity by use of digital terrain analysis