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林业科学 ›› 2007, Vol. 43 ›› Issue (07): 1-4.doi: 10.11707/j.1001-7488.20070701

• 论文及研究报告 •    下一篇

酸雨区亚热带针阔混交林的冠层淋溶特征

张西林1,2 蒋益民3 张龚3 向仁军1   

  1. 1.湖南省环境保护科学研究院,长沙410004;2.湖南大学环境科学与工程学院长沙410082;3.湖南省环境监测中心站,长沙410007
  • 收稿日期:2005-08-12 修回日期:1900-01-01 出版日期:2007-07-25 发布日期:2007-07-25

Canopy Leaching of the Subtropical Mixed Forest Under Acid Rain in Hunan Province

Zhang Xilin1,2,Jiang Yimin3,Zhang Gong1,Xiang Renjun1   

  1. 1.Hunan Research Academy of Environmental Sciences Changsha 410004; 2.Department of Environmental Science and Engineering of Hunan University Changsha 410082; 3.Hunan Province Environment Monitoring Center Changsha 410007
  • Received:2005-08-12 Revised:1900-01-01 Online:2007-07-25 Published:2007-07-25

摘要:

2001年1月至2002年6月在湖南韶山对亚热带针阔混交林4个采样区进行酸雨监测,分析林内穿透水中主要离子的淋溶特征。结果表明:大气降水经过森林冠层后pH值明显升高,亚热带针阔混交林对SO24-、NO3-、Mg2+、NH4+和Na+具有吸收作用,SO24-、Ca2+和Mg2+的冠层淋溶百分率随降雨量的增加明显减少。Ca2+、K+和Cl-的冠层淋溶百分率随着pH值增加而增加。韶山地区在常年酸沉降作用下,森林冠层对酸性离子SO42-、NO3-的吸收作用最强。根据18个月离子浓度平均值来计算,韶山地区森林冠层离子的淋溶序列为:K+>Ca2+>Cl->Mg2+>SO42->NO3->NH4+>Na+

关键词: 酸雨, 淋溶, 亚热带森林, 韶山

Abstract:

The leaching law of major ions in acid precipitation in a subtropical mixed forest was examined basing on the experiment at 4 sample sites in Shaoshan,Hunan Province from January 2001 to June 2002. The results showed that the pH value obviously increased and the ionic uptake evidences were proved by SO2- 4, NO-3, Mg2+ , NH+4 and Na+, when rain water passing through the canopy. The dissolved percentage of SO42-, Ca2+ and Mg2+ had the tendency to reduce with the increase of the rainfall. Dissolved percentage of Ca2+ , K+and Cl-showed a tendency to increase along with increase of pH value. Shaoshan forest canopy has the strongest effects on the uptake of SO42-、NO3- under acid rain.The ionic leaching order in Shaoshan forest canopy was K+>Ca2+>Cl->Mg2+ >SO42->NO3->NH4+>Na+.

Key words: acid deposition, leaching and uptake, subtropical forest, Shaoshan