地形条件及地下水位与植被覆盖率相关关系研究

Research on the Relative Among Vegetation Coverage,Topographic Conditions and Groundwater Head

植被覆盖率常作为地表蒸腾、降雨截流、水体流失的重要因素,也作为生态环境影响评价中的关键因子。而植被覆盖率又受到地形条件、坡度、地下水位高程等因素影响,因此研究植被覆盖率与其影响因素间的相互关系具有重要意义。本文针对某磷矿矿区,使用MGWT和ArcGIS软件提取坡度、地下水位、植被覆盖率等数据,分析得到不同坡度、地下水位埋深与植被覆盖率间的相关关系,得到如下的结果:在地下水补给区、径流区、排泄区地下水位埋深逐渐变浅,使得植被吸收地下水分的能力增强,有利于植物生长,地下水位高程与植被覆盖率之间的相关系数随着地下水位高程增加而减小,直至为负相关;坡度与植被覆盖率之间的相关系数呈现正相关,即坡度越大,植被覆盖率与坡度间的相关性越强。

Vegetation coverage is often used as an important factor of surface transpiration,rainfall interception and water loss,as well as a key factor in ecological environmental impact assessment.However,vegetation coverage rate is affected by topographic conditions,slope,groundwater level elevation and other factors,so it is of great significance to study the relationship between vegetation coverage rate and its influencing factors.In this paper,MGWT and ArcGIS were used to extract slope,groundwater level,vegetation coverage and other data for a phosphate mine,and the correlation between different slope,groundwater level buried depth and vegetation coverage was analyzed.The following results were obtained,in the groundwater recharge area,runoff area and discharge area,the depth of groundwater level gradually becomes shallower,which enhances the ability of vegetation to absorb groundwater water and is conducive to plant growth.The correlation coefficient between groundwater level elevation and vegetation coverage rate decreases with the increase of groundwater level elevation until it is negative correlation.The correlation coefficient between slope and vegetation coverage is positively correlated,that is,the higher the slope,the stronger the correlation between vegetation coverage and slope.