【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+>SO24->NO3->NH4+>Na+。更多还原

【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 SO 2- ₄, NO-₃, Mg 2+ , NH+₄ and N++-a, when rain water passing through the canopy. The dissolved percentage of SO 2- ₄, Ca 2+ and Mg 2+ had the tendency to reduce with the increase of the rainfall. Dissolved percentage of Ca 2+ , 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 SO 2- ₄、NO-₃ under acid rain.The ionic leaching order in Shaoshan forest canopy was K+>Ca 2+ >Cl->Mg 2+ >SO 2- ₄>NO-₃>NH+₄>Na+.更多还原