Canopy leaching of subtropical mixed forests under acid rain |
| |
| Authors: | Renjun Xiang Liyuan Chai Xilin Zhang Gong Zhang Guifang Zhao |
| |
| Institution: | (1) Hunan Research Academy of Environmental Sciences, Changsha, 410004, China;(2) College of Metallurgy, Central South University, Changsha, 410083, China;(3) Department of Environment Science and Engineering, Hunan University, Changsha, 410007, China |
| |
| 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 SO4
2−, NO3
−, Mg2+ and NH4
+ ions, especially of NH4
+ and NO3
−. The percentages of dissolved SO4
2−, 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 SO4
2− and NO3
− ions under acid rain conditions. The decreasing order of ions leaching in the forest canopy is as follows: K+ > Ca2+ > Cl− > Mg2+ > SO4
2− > NO3
− > NH4
+ > Na+.
__________
Translated from Scientia Silvae Sinicae, 2007, 43(7): 1–4 译自: 林业科学] |
| |
| Keywords: | acid deposition leaching and uptake subtropical forest Shaoshan City |
| 本文献已被 万方数据 SpringerLink 等数据库收录！ |
|
