基于石生藓类氮含量的贵阳地区大气氮沉降
Quantification of atmospheric nitrogen deposition at Guiyang area based on nitrogen concentration of epilithic mosses
查看参考文献33篇
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文摘
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对贵阳市区到农村地区的石生藓类氮含量进行了系统分析,并根据藓类氮含量(y,%)和大气氮沉降(x, kg hm~(-2) a~(-1))的平均定量关系(y=0.052x+0.7325)计算了各采样点的大气氮沉降值.贵阳地区大气氮沉降的变化范围为0.91～44.69kg hm~(-2) a~(-1),市区大气氮沉降最高平均(29.21±6.17)kg hm~(-2) a~(-1),主要来自城市废水NH3释放;最低平均(11.95±3.95)kg hm~(-2) a~(-1),出现在城市和农村的结合地带,主要原因在于来自市区的氮污染物减少、且大量分布了环城林带、农业活动相对较低;20km以外的农村地区大气氮沉降略微升高(平均(14.31±5.11)kg hm~(-2) a~(-1)),主要反映了农业施肥导致NH3释放的增加.结果表明,石生藓类氮含量是一种经济可靠的大气氮沉降监测工具,能够较准确地量化大气氮沉降的水平,并为深入研究大气氮沉降的生态环境效应提供基础资料. |
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其他语种文摘
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Nitrogen concentration of epilithic mosses from the urban area to rural area at Guiyang was investigated systematically, and the level of atmospheric N deposition at each sampling site was calculated according to the quantitative relationship (y=0.052x+0.7325) between moss N concentration (y,%) and atmospheric N deposition (x, kg hm~(-2) a~(-1)). The level of atmospheric N deposition ranged between 0.91-44.69 kg hm~(-2) a~(-1). The highest value (average (29.21±6.17) kg hm~(-2) a~(-1)) occurred at urban area (0-5km), which was mainly derived from higher NH3 release from city wastewater. The lowest level ((11.95±3.95) kg hm~(-2) a~(-1), 15-30km) at the combining area between the urban and rural area was mainly related to the reduced urban N pollutants, broad distribution of forest belt around the urban and lower agricultural intensity. Slightly higher N deposition ((14.31±5.11) kg hm~(-2) a~(-1)) re-emerged over 20km from the urban center, showing the increase of agricultural NH3 release in rural area caused by fertilizer application. Consequently, N concentration of epilithic mosses was an economic and reliable tool in monitoring atmospheric N deposition, which could exactly quantify the level of atmospheric N deposition and,provide basic information for further studying the ecological and environmental effects of atmospheric N deposition. |
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来源
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生态学报
,2009,29(12):6646-6653 【核心库】
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关键词
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大气氮沉降
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石生藓类
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生物监测
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城市地区
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0933 |
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学科
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普通生物学 |
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基金
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国家973计划
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国家自然科学基金
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文献收藏号
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CSCD:3770436
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