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Scientia Silvae Sinicae ›› 2007, Vol. 43 ›› Issue (07): 1-4.doi: 10.11707/j.1001-7488.20070701

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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

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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