Study On Flora Type And Soil Factor In Limestone Mountain In Centre Hunan And Sourthern Hunan

Limestone region in Central Hunan and Southern Hunan which belongs to subtropical monsoon climate, is a typical limestone distribution area in Hunan province, and it is also an extension of southwest limestone area to the north o This article is based on the typical sample investigation, sampling and analysis, vegetation community structure, biodiversity and soil physical and chemical properties of the potential, mild, moderate, severe and extreme limestone area. On the basis of these study, we explore different grade limestone in different vegetation types, and analyze vegetation succession process, different types of vegetation relationships with soil physical and chemical properties, for provide a reference for vegetation restoration of limestone areas of reference, obtained results as follows:1.Through the analysis of plant community in Central Hunan and Southern Hunan’ limestone,we found that:species richness and numerous in variety in our study area,tall arbor species in Fagaceae is the main edificatory or constructive species in limestone region; a diversity analysis showed that individual species distributed uniform and community diversity is fine;β diversity analysis showed that the speed of mild rocky desertification evoluted to potential rocky desertification is faster;The floristic geographical characteristics analysis found that The families’distri bution types Mainly in Tropical distribution,genus’distribution types Mainly in Tropic al distribution.2. Through investigations and statistics, we obtain that Southern Hunan including 63 families,131 genera and 173 species of vascular plants, and central Hunan including 54 families,108 genera and 129 species of vascular plant species, which is a High species richness. The flora of this area is characterized by both tropical and temperate characteristics. Branch-based distribution of tropical and category distribution of temperate zone is also a typical subtropical evergreen broad-leaved forest floristic geographical attributes.3.The results of study on physicochemical properties of limestone area in central and Southern Hunan show:Soil bulk density in Limestone area has a negative correlation with Capillary porosity, the total porosity, Capillary water holding capacity and Natural water content, Correlations between chemical indicators are mostly related to positive correlation.4.We found from the sutdy that the relationship with limestone mountain vegetation type and soil factors, Bulk density in soil physical indexes makes main effect,pH in Soil chemical index makes a significant effect in Fagaceae plant associations and shrub associations group, nitrogen content with significant difference in Arbor group and Article glutinous rice group.Soil total phosphorus and available phosphorus in different vegetation types have significant trends.Phosphorus were of significantly different between Fagaceae groups and shrub associations group.Available potassium were of significantly different between the group and shrub associations Fagaceae plant associations and associations Abelia group.5 In the process of vegetation recovery in limestone mountain in central and southern Hunan, we should mainly contained it in the potential of limestone and mild limestone area, and plant Large evergreen broad-leaved trees and shrub.Then in Moderate limestone area, we mainly plant dungarunga and shrub or shrub and herb. In Severe and Extreme limestone area, we should take afforestation the main.Tree species selection in each plantation, we chose Cyclobalanopsis glauca, Egeria glauca, Plerocellis tatarinowii, Kalopanax seplemlobus, Quercus serrata var. brevipetiolata, Quercus chenii, Sapium sebiferum, et al,Following the shrub can be used with Loropetalum chinensis, Serissa foetida, Vilex negundo var. cannabifolia, Abelia chinensis, Pyracantha fortuneana, et al.Herbaceous layer try to choose local native vegetation or not treated,take it rowg Naturally,make full use of natural ecological conditions to form a multi-layer mixed evergreen broad-leaved form.In cooperation with local agricultural and forestry sector.set apart hills for forestry.Hopes of limestone land to recover in Central Hunan and Southern hunan.