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PanLijun,HuangYuhui,ZhangWeiqiang,TangHonghui,SuMurong,GanXianhua
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Stream water quality impacted by different plantations in southsubtropics
Pan Lijun,Huang Yuhui,Zhang Weiqiang,Tang Honghui,Su Murong,Gan Xianhua
(Maintenance Center for Yunyong Ecological Forest of Foshan;Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization)
Abstract:
Four types of plantations in Yunyong forest farm in Foshan, including needle-broad leaf mixed plan- tations (MP), evergreen broadleaf plantations (EBP), Eucalyptus plantations (EP) and Cunninghamia lan- ceolata plantation (CLP), were studied to characterize local stream water quality. The results indicated that the stream water in all plantations was slightly acid with pH of 5.93-6.34. Total nitrogen concentrations of stream water in MP and EBP were significantly lower than that in EP. The total nitrogen concentration in water was above 2.0 mg·L -1 in EP and CLP, exceeding the level V of environmental quality limit of surface water stan- dard (EQSSW), while total phosphorus concentration reached the level Ⅱ or Ⅲ of EQSSW. For stream water in all plantations at different stand age, total water hard- ness and the concentrations of Cd, Hg met the standards of drinking water standard, while fluoride, Pb, Cu, Zn and Cr 6+ and As achieved level I of EQSSW. Grey cor- relation analysis and principal component analysis result shows that stream water quality was the highest in the CLP, followed by EP, MP and EBP.
Key words:  Stream water quality · Stand age · Planta- tion · South subtropics

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