Soil Heavy Metal Content and Enzyme Activity in -Producing Areas under Different Land Use Patterns.

In this study, we investigated the content of soil heavy metals, the level of heavy metal pollution and the characteristics of soil enzyme activity under three different land use patterns of base, forestland and wasteland in Jianhe County, Qiandongnan Prefecture, Guizhou Province, revealing the intrinsic correlation between heavy metal content and soil enzyme activity to reveal the relationship between soil enzyme activity and heavy metal content under different land use patterns in the production area. The results showed that soil Cd and Hg contents in base both exceeded the national soil background value. The single pollution index indicated that Cd had the greatest contribution to , and the comprehensive pollution index () demonstrated no heavy metal pollution in the soil of -producing areas. Under different land use patterns, the enzyme activity was forestland > wasteland > base, and catalase and acid phosphatase activities presented significant spatial differences ( < 0.05). The correlation between soil enzyme activity and heavy metal content was uncertain due to the changes in land use patterns and heavy metal species. The proportions of positive correlation and negative correlation between soil enzyme activity and heavy metals in base were 50%, respectively. In the forestland, soil enzyme activity was positively correlated with heavy metals, while in the wasteland, soil enzyme activity was negatively correlated with heavy metals. This study revealed that the changes in heavy metal content should be focused on for the soil quality in -producing areas under different land use patterns. The results of the study provide some basic theoretical references for the improvement of soil quality in the production area of under different land use practices.