朱溪流域地形对土壤稀土元素空间分布规律的影响

Effect of Terrain on the Spatial Distribution Rules of Rare Earth Elements in Soil at Zhuxi Watershed

以长汀县朱溪流域为例,采用ArcGIS中的克里金插值法生成流域土壤稀土元素含量的空间分布图,采用地形分析功能模块生成地形因子包括高程、坡度和坡向,通过空间分析和相关性分析研究地形因子对稀土元素空间分布规律的影响。分析结果表明:①朱溪流域表层土壤稀土元素含量的空间分布总体上呈现出西南高东北低、自西南向东北倾斜的特征;②稀土元素含量随着高程升高呈现先降低再增高的规律,随坡度的升高呈现逐渐降低的规律,与坡向之间无明显的关系;③地形因子尤其是高程和坡度是稀土元素空间分布的重要影响因子。

Zhuxi watershed in Changting County was selected as an example for study.The Kriging interpolation method in ArcGIS was used to generate the spatial distribution rules of rare earth element content in the soil of the watershed,and the terrain analysis function module was used to generate terrain factors including elevation,slope and aspect.Through spatial analysis and correlation analysis it was studied the affect of terrain factors on the spatial distribution rules of rare earth elements.The analysis results show that:①the spatial distribution of rare earth element content in the surface soil of the Zhuxi watershed is generally high in the southwest and low in the northeast,with the incline trend from the southwest to the northeast;②the content of rare earth elements decreases first and then increases together with the increase of elevation,and gradually decreases as the increase of slope,while there is no obvious relationship between the content and the slope direction;and③terrain factors,especially the factors of elevation and slope,are important to affect the spatial distribution of rare earth elements.