| The objects of study are vegetation and soil of the planted forest which had planted20years at Gousimao mountain,Taihe country of Jiangxi province, Investigating the correlation of ecological restoration effects of different types planted forest species diversity and trees growth and soil characteristics. Designed to provide a reference for the effects to reveal the processes and mechanisms of ecological recovery measures of planted forest in erosion eroded red soil area on soil physical and chemical properties and to explore the effects for the process of climate change.Using the stepwise regression analysis and gray correlation analysis method, Making a quantitative analysis between biological diversity index of vegetation and soil properties and exploring the correlation of various factors, Discussing the effects between that stand density, canopy density and soil properties and understory vegetation species diversity. The results demonstrated that:(1)The vegetation types and quantities increase a lot after planted forest in the serious degraded red soils area.According to investigation statistics, there are46families,79genera,92species of the shrub-grass layer,which include8families,8genera,8species of ferns and38families,71genera,84species of seed plants.(2)The coefficient of variation of species diversity index belong to moderate variation, Relatively the coefficient of variation of richness and uniformity are more bigger, reached to52%and62%.But Simpson index and Shannon-Wiener index are smaller,reached to52%and62%.As a group,Community species diversity by large to small order is:Mixed forests>Broad-leaved forest>Coniferous forest>Grass control.(3)The soil quality improved but it still hard and show slant acidity after planted forest,some places also show weakly alkaline soil in the test region.The soil quality in the mixed coniferous broad leaved forest is best contrast with others stand-types.In the grass control,some nutrient index such as nitrogen has more content in the soil,because the stock rising in the local place..(4)The soil moisture content and the planting density and canopy density on understory species diversity is more apparent; the gray correlation analysis method to get the soil pH, field capacity, capillary water content, saturated water content, all K greater impact on the vegetation diversity index of soil factors. The recovery effect and ecological functions to be affected are different for forest restoration with configuration of different species and cultivation measures. |
