Distribution of Water-stable Aggregates and Organic Carbon in Response to Simulated Nitrogen Deposition in a Chinese Fir Plantation
The effects of 8-year-long simulated nitrogen deposition on the distribution of water-stable aggregates and concentrations of soil organic carbon in a Chinese fir plantation located in Sanming,Fujian province were investigated.Nitrogen loadings were designed N0(control),N1,N2 and N3 at the doses of 0,60,120,240 kg/hm2,respectively.Bulk soil samples was separated into six aggregate-sizes(＞2 mm,1～2 mm,0.5～1 mm,0.25～0.5 mm,0.053～0.25 mm and ＜0.053 mm) and the associated soil organic carbon contents were determined.Results showed that the size groups of soil water-stable aggregates were in the order of 1～0.5 mm,＞2 mm,2～1 mm,0.5～0.25 mm,0.25～0.053 mm,＜0.053 mm.Compared with the control(N0),N1 and N2 treatments significantly increased the content of water-stable aggregates (＞ 0.25 mm) and soil aggregates mean weight diameter,but N3 treatment showed inhibition effect.Contents of soil organic carbon was highest in ＞2 mm fraction of soil aggregates,but no significant difference was found among treatments.Nitrogen additions promoted carbon stocks of soil water-stable aggregates,which was highest in N1 treatment.Results indicated that increasing of nitrogen deposition would increase the potential of soil carbon sequestration in the subtropical regions.
nitrogen depositionwater-stable aggregateorganic carboncarbon storageChinese fir plantation
国家科技期刊平台
NSTL
万方数据
维普
