Topographic variation of soil nitrogen mineralization and microbial biomass in Japanese cedar (Cryptomeria japonica D. Don) stands at Myougodani watershed, Toyama, Japan
Topographic variation of soil nitrogen mineralization and microbial biomass in Japanese cedar (Cryptomeria japonica D. Don) stands at Myougodani watershed, Toyama, Japan
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日本富山名五谷流域的日本雪松（Cryptomeria japonica D. Don）土壤氮矿化和微生物生物量的地形变化
DOI：
10.1080/00380768.2003.10410346
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发表时间：
2003
影响因子：
2
通讯作者：
K. Zushi
中科院分区：
文献类型：
--
作者：
K. Zushi
摘要以日本柳杉（Crgptomeria japonica D.）为研究对象，研究了不同地形部位的土壤氮矿化、硝化作用和微生物生物量的空间变异性。种植园。流域地形的特点是使用来自GIS分析的地形指数。地形指数较好地反映了土壤水分状况、土壤全碳、全氮含量和交换性盐基含量的空间变异性。然而，该指数与净氮矿化和微生物生物量的空间变异性不显着相关。地形指数和土壤性质（土壤总C和N含量，C / N比，交换性盐基浓度，粘粒含量）进行主成分分析，以消除变量之间的多重共线性，并表示为新的正交变量的变量。主成分分析结果表明，土壤性质可分为两类：PC 1（土壤养分库）和PC 2（土壤粘粒含量）。地形指数与PC 1密切相关，与PC 2相关不显著。PC得分对净氮矿化和微生物生物量的回归表明，PC 2的氮矿化和微生物生物量的变异性的贡献相对较高。这一结果表明，不仅地形因素，而且粘粒含量施加了重要影响的空间格局的N矿化和微生物生物量在一个流域内的单一物种的森林。
Abstract 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 (Crgptomeria 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.