用苔藓组织硫含量、S/N比值探讨江西省大气硫沉降

本文通过对江西省"r"型酸控区19个采样点88个细叶小羽藓样品进行分析,发现在大气硫浓度高的地区苔藓组织硫含量也高,说明细叶小羽藓可以作为监测植物指示大气硫污染。江西省苔藓组织硫含量从南往北递增,赣东北苔藓组织有着高的硫含量。南昌市和贵溪市市区苔藓组织硫含量和其相应的郊区苔藓组织硫含量有显著性差异(P<0.01),且市区苔藓组织硫含量明显高于郊区苔藓组织硫含量,说明这两个城市市区苔藓受到了点污染源的影响。对细叶小羽藓组织硫含量和大气SO2浓度进行线性回归分析,发现细叶小羽藓的组织硫含量(y)和大气SO2浓度(x)存在显著线性正相关(y=6.09x+0.16,R2=0.95,P=0.003)。用S/N=0.15把江西省采样点分为两组,贵溪市贵溪冶炼厂周围有着高的大气硫沉降量(组Ⅰ),其它采样点均是硫缺乏或者说是氮过量(组Ⅱ)。

Use Sulfur Contents and S/N Ratios of Mosses to Explore Atmospheric Sulfur Deposition in Jiangxi Province

This study investigated the S contents in 88 moss samples(Bryohaplocladium microphyllum(Hedw.) R.Watanabe et Iwats) collected from 19 sampling locations in Jiangxi Province.The sulfur contents of moss tissues in different cities were tested by T-test and the linear regression analysis of moss tissues and atmospheric SO2 concentrations were processed.Mosses had higher S contents in the area where higher atmospheric sulfur concentrations were found,showing that mosses can be used as a bio-indicator of atmospheric sulfur pollution.The sulfur contents of mosses increased from south to north and mosses had higher sulfur contents in the northeast compared to those mosses in the south.In Nanchang and Guixi cities,significant differences in sulfur contents were observed between urban mosses and suburban mosses(P<0.01),and sulfur contents in the former ones were higher than those in the latter ones.These indicated that mosses in these two cities were influenced by point pollution sources.Through linear regression analysis,we found that the sulfur contents of mosses(y) and atmospheric SO2 concentrations(x) had significantly linear correlations(y=6.09x+0.16,R2=0.95,P=0.003).Sample points can be divided to two groups by S/N=0.15.Group one is the Guixi smelting plant which has high sulfur deposition while the other group refers to other sampling sites where nitrogen is highly deposited.