Effects of Tree Species Diversity on Soil Nitrogen Components in Subtropical Natural Forests,Southwest China
Forest plant diversity plays an important role in soil nitrogen sequestration.In response to the uncertainty of forest soil ni-trogen due to various factors,this study focuses on the soil of subtropical natural forests in Southwest China.Soil nitrogen compo-nents(including total nitrogen,ammonium nitrogen,nitrate nitrogen,dissolved organic nitrogen,and microbial biomass nitrogen),along with soil physicochemical properties,were measured.Through redundancy analysis and variation partitioning a-nalysis,the effects of forest tree species diversity,tree size,and soil physicochemical properties on soil nitrogen components were explored.The results showed that tree species diversity could significantly increase soil total nitrogen(P=0.048),dissolved or-ganic nitrogen(P=0.001),and microbial biomass nitrogen(P=0.003),but the changes in ammonium nitrogen(P=0.226)and nitrate nitrogen(P=0.873)were not significant.The individual effect of tree species diversity had the largest explanatory power(27.1%)for changes in soil nitrogen components,which was 16.9 times that of tree size and 2.0 times that of soil physicochemical properties.The Shannon-Wiener index had the greatest impact on the changes in soil nitrogen components(P<0.01).The re-search results provide a basis for promoting soil nitrogen accumulation and enhancing soil nitrogen sequestration capacity by protec-ting forest plant diversity in the region.
subtropical foresttree species diversitytree sizesoil physicochemical propertiesnitrogen components
NETL
NSTL
万方数据
