Effects of stand density differences on litter storage capacity and soil organic matter of Eucalyptus dunnii plantations

By taking the ten-year-old Eucalyptus dunnii plantations with three stand density(1 250,1 666,2 000 plants/hm2) in Huangmian Forest Farm in Guangxi province as the studying objects,the stands' forest growth characteristics,litter storage capacity,soil organic matter content and soil pH value were investigated.The results show that the tree height and diameter with 2 000 plants/hm2 stand density were significantly lower(P0.05) than others among different stand density E.dunnii plantations;But the contents of soil organic matter with 2 000 plants/hm2 stand density were significantly higher than that of other two kinds of stand density,and the litter storage capacity among three kinds of density differences did not reach significant level;In the soil vertical direction,along with the depth deepens adown,the soil organic matter content had a descending trend,and pH value showed a ascendant trend;At the same time,the planting density also had a significant effect on the soil pH value.Therefore,considering the stand volume and plantation sustainable management,the density of 2 000 plants/hm2 is superior to other two planting densities.