| In this research, species diversity and soil fertility of three different forest types (C. hystrix pure forest,P.massoniana pure forest, C. hystrix+ P.massoniana mixed forest) as the study object in guangxi daqingshan mountain.The species composition, structure, soil fertility of stands are analyzed,and linear correlation analyze the relationship between species diversity and leaf area index,crown density, soil physicochemical characteristics by using the typical correlation analysis.This research results show that:1.There are 63 species from 56 generas in 39 families in C. hystrix pure forest, which 44 species are woody plants,19 species are herb plants.70 species from 61 generas in 43 families in P.massoniana pure forest,which 55 species are woody plants,15 species are herb plants.80 species from 66 generas in 53 families in C. hystrix+ P.massoniana mixed forest,which 56 species are woody plants,25 species are herb plants.2.The highest species diversity in three communities is C. hystrix+ P.massoniana mixed forest,the second is C. hystrix pure forest,the lowest is P.massoniana pure forest.In a view of different layers,the highest diversity in tree layers and herb layers are C. hystrix+ P.massoniana mixed forest,and the shrub layer is P.massoniana pure forest.3.The soil bulk density is increasing with the soil depth,the surface and intermediate soil bulk density in mixed forest is better than pure forest.The soil porosity,soil aeration and soil retained water in mixed forest is decreasing with the soil depth,and tha change in pure forest is not obvious.The soil bulk density,soil porosity,soil aeration and retained water of the surface soil in mixed forest is higher than oure forest,but of the under surface soil in mixed forest is between C. hystrix pure forest and P.massoniana pure forest.Most of soil nutrient content in mixed forest is higher than pure forest,the ANOVA results show that,the mixed forest and pure forest soil nutrient content are significantly different,It can be said to improve soil physical properties of mixed forest was better than pure forest, and integrated soil fertility levels are higher than the pure forest.4. Correlation analysis showed that, there is a certain correlation between species diversity and leaf area index, canopy density, but not closely related.there is strong linear correlation between species diversity and soil physical properties,but the the relationship between species diversity and soil fertility in remaining forest stand is not closely related.in a word,the levels of species diversity and soil fertility in C. hystrix+ P.massoniana mixed forest is higher than C. hystrix pure forest and P.massoniana pure forest. |
