贵州省湄潭县茶叶产地土壤重金属元素空间分布特征-环境工程专业论文.docxVIP

贵州大学研究生论文 贵州大学研究生论文 PAGE PAGE 5 Cr content of soil surface projections, and , the parameters have been determined reasonable. That provided a foundation for the predictive value of the foundation. In whole study area, Cr content distribution is continuous, they can be divided into several large patches, the distribution was evident. According to the single pollution index of the evaluation criteria, the western region of dark brown has been considered as the Cr concentration, P 1, where is not suitable for cultivation, bright yellow region is relatively low Cr area (Figure 4-11), P ≤ 1, where is suitable for planting. It can be seen from the chart. Cr ranged along the oblique line from the western K area to the L concentrated area along the oblique line from the western K area to the L concentrated area along the northeast direction. Cr contented in the soil concentrated spatial distribution, the distribution of its content is relatively clear patch. The spatial orientation of Cr is completely obvious, so, we must attention and take measures to the zone close to the dark brown scope. According to the content of Cr in the soil from the study area(plaque to form a ring area), decreasing to around radial. This result may be due to the industry in the western Meitan, it is effected by the non-regional factors. As the western patches consistent with the main agricultural township, the soil pollution may be associated with application of pesticides and irrigation, sewage sludge fertilizer, and environmental pollution-related; the northeast section of the emergence of high value may be with the local soil background conditions. In short, in addition to constraints by the parent material, the study area, high-value agricultural and industrial region may have been effected by the production activities. Key words: Guizhou Province, Meitan county, tea, the heavy metal of soil , spatial distribution 目 录 摘要 ABSTRACT 目录 第一章 绪论 1.1 研究课题的提出 …………………………………………………………1 1.2 研究的目的和意义