Water management plays an important role in soil greenhouse gas emission and phytoremediation of soil contaminat-ed by heavy metals.In this study,the hyperenriched plant Pterocypsela indica was selected as the research object to investigate the effects of 55％water holding capacity(55％WHC)and 75％water holding capacity(75％WHC)on soil greenhouse gas emis-sions and phytoremediation.The results showed that compared with 55％WHC treatment,75％WHC treatment significantly increased the stress resistance of P.indica,and 75％WHC treatment increased the aboveground Pb content and accumulation of P.indica by 92.3％and 91.0％,respectively.Compared with 55％WHC treatment,75％WHC treatment reduced cumulative green-house gas emissions,and soil CO2 cumulative emissions were reduced by 18.8％and 10.0％,and N2O cumulative emissions were reduced by 9.1％and 47.0％,respectively,under the two conditions of planting and no planting of P.indica.Cumulative CH4 emis-sions were reduced by 17.1％and 43.7％,respectively.In conclusion,compared with 55％WHC,75％WHC treatment can promote the growth and accumulation of heavy metals,reduce greenhouse gas emissions,and is more suitable for phytoremediation.
维普
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