三峡库区消落带160~175 m植被生长与土壤环境关系研究

Study on the Relationship Between Vegetation and Soil of 160-175m in Water-level Fluctuation Zone of the Three Gorges Reservoir Area

探究不同海拔高程处植物群落与土壤环境间的关系及两者与海拔的变化规律,以三峡库区香溪河段水淹前消落带160~175 m为研究区,运用Pielou指数、Shannon-wiener指数、Simpson指数以及重要值等指标进行植物群落特征调查分析.结合室内分析,研究了土壤pH、容重SD、有机碳SOC、土壤养分(TN、TP、AN、AP)的变化特征,并利用冗余分析(RDA)和Pearson相关性分析研究了土壤理化因子与消落带植物群落多样性的关系.结果显示:植物群落结构简单,物种较少,且随海拔高程的增加植物群落组成和生物多样性显著增加.土壤理化性质随海拔高程的变化呈波动变化,土壤容重逐渐升高,土壤养分含量则先升高后降低.相关性分析结果表明海拔对消落带地区植物群落和土壤环境具有重要影响,而土壤环境与植物群落之间存在相互作用.

To study the relationship between plant communities and soil environment at different elevations and their changes with elevations,in this paper,160-175 m of hydro-fluctuation-belt before flooding in Xiangxi River Section of the TGR is taken as the study area.The Pielou index,Shannon-wiener index,Simpson diversity index and the Important values were used to investigate and analyze the characteristics of vegetation communities.Combined with the indoor analysis,The variation characteristics of soil pH,soil bulk density,soil organic carbon,and soil nutrients(TN,TP,AN,AP)are studied.The relationship between soil properties and plant community diversity in the hydro-fluctuation-belt is analyzed by using the Redundancy Analysis(RDA)and Pearson Correlation Analysis.The results show that the plant community structure is simple with few species,and the composition of plant community and biodiversity increase significantly with the increase of altitude.The physical and chemical properties of soil fluctuate with the elevation.The bulk density of soil gradually increases and the soil nutrient content increases first and then decreased.The results of correlation analysis show that elevation has an important impact on vegetation growth and soil environment change in the zone,and there is an interaction between the soil environment and the plant community.It provides a basis for vegetation screening and ecological restoration in the hydro-fluctuation-belt of the TGR.