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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 |
