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Canopy leaching of subtropical mixed forests
under acid rain
- XIANG Renjun1, ZHAO Guifang1, CHAI Liyuan2, ZHANG Xilin3, ZHANG Gong4
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1.Hunan Research Academy of Environmental Sciences; 2.College of Metallurgy, Central South University; 3.Hunan Research Academy of Environmental Sciences; Department of Environment Science and Engineering, Hunan University; 4.Department of Environment Science and Engineering, Hunan University;
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| Published |
| 05 Sep 2008 |
| Issue Date |
| 05 Sep 2008 |
Abstract
Leaching of major ions from acid precipitation in a subtropical forest was examined based on an experiment in four sample sites in Shaoshan City, Hunan Province, China, from January 2001 to June 2002. Results clearly show that when rain passed through the canopy, pH increased and the evidence of ion uptake was presented for SO42-, NO3-, Mg2+ and NH4+ ions, especially of NH4+ and NO3-. The percentages of dissolved SO42-, Ca2+ and Mg2+ show a decreasing trend with increasing rainfall. Percentages of leaching Ca2+, K+ and Cl- ions show an increasing trend as a function of increased pH values. The forest canopy in Shaoshan City has a strong effect on the uptake of SO42- and NO3- ions under acid rain conditions. The decreasing order of ions leaching in the forest canopy is as follows: K+ > Ca2+ > Cl- > Mg2+ > SO42- > NO3- > NH4+ > Na+.
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XIANG Renjun, ZHAO Guifang, CHAI Liyuan, ZHANG Xilin, ZHANG Gong.
Canopy leaching of subtropical mixed forests
under acid rain. Front. For. China, 2008, 3(3): 321‒325 https://doi.org/10.1007/s11461-008-0044-5
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