2017 NO.1
Stream water quality impacted by different plantations in south subtropics
|
|
||
| 摘要: | ||
| 关键词: | ||
| DOI： | ||
| 分类号： | ||
| 基金项目： | ||
| Stream water quality impacted by different plantations in south subtropics | ||
| Pan Lijun | ||
| Maintenance Center for Yunyong Ecological Forest of Foshan | ||
| 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 |