文献类型：期刊文献

中文题名：广州流溪河针阔混交林冠层对穿透水离子浓度的影响

英文题名：Crown Effects on Ion Concentration in Throughfall Of a Coniferous-broadleaved Stand under Acid Deposition at Liuxihe,Gangzhou

作者：周光益[1,2] 田大伦[1] 邱治军[2] 邓湘雯[1] 王旭[2] 刘敏[2]

第一作者：周光益

机构：[1]中南林业科技大学;[2]中国林科院热带林业研究所

年份：2009

卷号：29

期号：5

起止页码：32-38

中文期刊名：中南林业科技大学学报

外文期刊名：Journal of Central South University of Forestry & Technology

收录：CSTPCD;;北大核心:【北大核心2008】；CSCD:【CSCD_E2011_2012】；

基金：科技部国际合作项目(2007DFA31070);广州市林业局项目(流溪河水源林生态水文功能与效益监测研究)

语种：中文

中文关键词：流溪河;酸雨;化学组成;冠层作用

外文关键词：Liuxihe; acid rain; chemical composition; crown effect

分类号：S713

摘要：2006年7月-2008年5月,在广州流溪河地区采集了70次空旷地降雨水样（雨量范围0.7-184.2 mm）和对应的马尾松-阔叶树混交林的林内穿透雨水样,用于分析当地的雨水酸化特征和林冠影响穿透水中主要离子浓度的作用规律.结果显示：（1）流溪河的酸雨率为64.29%.（2）林冠的缓冲作用使得穿透雨的pH值升高,但穿透雨的多数离子浓度高于林外降雨,表明有离子从林冠淋出或者淋洗.（3）对多数离子而言,冠层作用随雨水酸度变化存在一个转折点,即pH值〈5.0或者（SO4^2-＋NO^3-）〉100μeq.L^-1时,冠层增加离子浓度的作用随雨水酸度增强而增加;而在pH值〉5.0或者（SO4^2-＋NO^3-）〈80μeq.L^-1时,穿透水离子浓度的冠层贡献率随雨水酸度减少而增加.（4）林冠层作用的月波动明显,在雨量较大的4-7月间,雨水中离子含量较小,冠层对穿透水离子浓度增加的贡献率小.（5）在单次降雨过程中,有些离子（尤其是NH^4＋、PO4^3-、NO^2-、和NO^3-）出现负淋溶现象,说明森林对这些离子具有吸附或者吸收作用.（6）混交林的林冠对穿透水中F^-、Cl^-、NO2^-、NO3-、PO4^3-、SO4^2-、Org-C、NH^4＋、Al^3＋、Ca^2＋、Mg^2＋、K^＋、Na^＋的浓度增加贡献率年值分别为112%、288%、-8%、46%、28%、66%、222%、-35%、82%、413%、770%、790%和51%.
By monitoring the rainfall events ranging from 0.7 mm to 184.2 mm during the study period of July 2006 to May 2008 and by analyzing chemically 70 samples from both rainwater in open field and throughfall under the canopy of a coniferous-broadleaved stand at Liuxihe,Guangzhou,their crown effects on the variation of ion concentration in the throughfall were evaluated.Results indicate that：（1） the acid rain frequency at Liuxihe is as high as 64.29%;（2） the buffering effect of canopy lowers the pH-value of throughfall but the concentration of most ions in throughfall is higher than that in the rainwater in open field,showing an effect of leaching or washing from canopy;（3） for most ions,when the pH-value of rainwater is less than 5.0 or the total concentration of SO42-and NO3-is more than 100 μeq·L-1,the crown effect of increasing ion concentration increases with the rising acidity of rainwater;however,when the pH-value is more than 5.0 or the total concentration of SO42-and NO3-is less than 80 μeq·L-1,the crown effect also increases with a decrease of the rainwater acidity;（4） there is an obvious monthly variation of crown effects： during a rich-rainfall season from April to July,the effect of canopy on ion concentration is low;（5） during some rainfall events,the concentration of some ions（especially NH4＋,PO4^3-,NO^2-,and NO^3-） is lower in throughfall than in open field rainwater,indicating an effect of canopy to absorb or up-take such ions;and（6） the yearly ratios of ion concentration increase of throughfall compared to open field rainwater for F^-、Cl^-、NO2^-、NO3-、PO4^3-、SO4^2-、Org-C、NH^4＋、Al^3＋、Ca^2＋、Mg^2＋、K^＋、Na^＋ are 112%,288%,-8%,46%,28%,66%,222%,-35%,82%,413%,770%,790% and 51% respectively.