Research on Changes of Soil Urease Activity during the Process of Phytoremediation in Heavy Metal Contaminated Areas of Changpo Tailing Mine Dam of Nandan County

LIU Xu-hui,ZENG Yan-lan,QIN Yong-rong*,NONG Liu-yan,ZHANG Kang,CHEN Yan-shi(Department of Chemistry and Life Sciences,Hechi University,Yizhou 546300,China)

Changpo tailing mine dam;Heavy metal contaminated area;Phytoremediation;Urease activity of soil

The soil's fertility characteristics including soil pH,organic matter content,alkali-soluble nitrogen content and the urease activity were studied in this experiment,of which the surface soil was gathered from abandoning ore dam in Changpo heavy metal contaminated area Nandan county of Guangxi.We used correlation analysis method with mathematical statistic,researching relations between the soil urease activity and the soil fertility level were studied with correlation analysis by comparing the soil urease activity in heavy metal contaminated area along with ecology recovery.The results show that the organic matter content is low,alkali-soluble nitrogen content and the urease activity are relatively high of the soil from abandoning ore dam.It shows positive correlation between urease activity and alkali-soluble nitrogen content,the correlation between urease activity and organic matter content is not significant.Along with soil ecology recovery of abandoning ore dam,the urease activity is higher of rhizosphere soil of Miscanthus floridulus,Carex dispalata and Hypolytrum nemorum,while it is low of rhizosphere soil of Cynodon dactylon and Neyraudia reynaudiana,we think Miscanthus floridulus,Carex dispalata and Hypolytrum nemorum are the best species for ecology recovery without introducing external species.Cynodon dactylon and Neyraudia reynaudiana can be chosen for the second stage.