Effects of Different Tree Species Configuration Modes and Canopy Density on Soil Nutrients in Eucalyptus robusta Plantation
Because the planting mode of Eucalyptus robusta plantation is basically a single mode of multi-generation continuous planting,many ecological problems are caused.Therefore,ensuring that artificial E.robusta forests can achieve long-term and stable sustainable management has become a hot issue in the cultivation technology of artificial E.robusta forests.In order to achieve this goal,adopting appropriate tree species configuring and moderate canopy density is an effective way to adjust the stand structure and enhance the soil quality.In this study,six E.robusta pure forest plots were selected from the West Coast Forestry Farm in Foshan City,China,to study the effects of two species configuration modes(A is 5 species of Theaceae,B is 5 species of Theaceae and 2 de-ciduous broad-leaved tree species)and three E.robusta canopy density(Y1 is 0%,Y2 is 15%,and Y3 is 30%)on the soil physical and chemical properties,enzyme activities,and soil stoichiometric ratios.Among the different tree species configuration mode,the soil capillary water holding capacity,soil capillary porosity and soil void ratio of three soil layers(0-20,20-40,40-60 cm)and the total nitrogen N∶P,catalase activity and urease activity of 0-20 cm soil layer in Y3 plot of mode B were significantly higher than those in Y3 plot of mode A(P<0.05).In different canopy density,the total phosphorus,available phosphorous,available potassium,cata-lase and urease activity of the three soil layers in the Y3 plot of the A model were significantly higher than those in the Y1 plot(P<0.05),and the soil organic carbon,total nitrogen,alkali-hydrolyzable nitrogen,available phosphorous,catalase activity and N∶P of the three soil layers in the Y3 plot of the B model were significantly higher than those in the Y1 plot(P<0.05).In conclusion,the ap-propriate tree species configuration mode and canopy density are beneficial to the improvement of soil nutrients and enzyme activities,and the pattern of Theaceae tree species and deciduous broad-leaved tree species under 30%E.robusta canopy density has a good prospect of application in the transformation of South China.
Eucalyptus robustaconfiguration modecanopy densitysoil physical and chemical propertiessoil enzyme activ-itysoil stoichiometric ratio
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