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西藏林芝大气有机氮沉降
引用本文:邵伟,张颖,宋玲,贾钧彦,刘学军,蔡晓布.西藏林芝大气有机氮沉降[J].生态学报,2009,29(10):5586-5591.
作者姓名:邵伟  张颖  宋玲  贾钧彦  刘学军  蔡晓布
作者单位:1. 西藏农牧学院资源与环境系,林芝,860000
2. 中国农业大学资源与环境学院,北京,100193
基金项目:国家科技支撑计划重点资助项目,西藏自治区科技厅资助项目,国家自然科学基金资助项目,中英合作项目 
摘    要:2005~2007年,利用雨量器在西藏林芝地区定点采集雨样,研究了该地区降雨中有机氮浓度、沉降量的月、季动态变化.结果表明:西藏林芝地区雨水有机氮月均浓度和沉降量分别为0.21 mg/L和0.50 kg/hm2.不同月份比较,监测期内,2006年7、8月份有机氮浓度平均为1.26 mg/L,明显高于其它年份同时期水平.2007年各月有机氮浓度在0.15~0.53 mg/L之间,变化幅度较小.不同季节内,有机氮浓度差异不大,春\,夏季较高,浓度变化受降雨量影响较小.有机氮湿沉降量与降雨量呈线性正相关,3a的相关系数分别为0.46(p=0.019)、0.69(p=0.001)、0.77(p=0.001).各月沉降量差异较大,2006年6、7两个月有机氮输入量明显偏高,月均达到1.32 kg/hm2,2007年有机氮沉降主要集中在6、7、9月份3个月.四季有机氮沉降量与降雨量呈线性正相关,相关系数0.99(p=0.01).四季中,夏季沉降量最高,为0.93 kg/hm2,占全年的46%.在整个监测期内,有机氮占雨水总氮的比例平均为62%,是大气氮沉降的重要组分.

关 键 词:氮沉降  有机氮  降雨  西藏
收稿时间:6/6/2008 12:00:00 AM
修稿时间:2009/5/14 0:00:00

Atmospheric organic nitrogen deposition in Linzhi area, Tibet
SHAO Wei,ZHANG Ying,SONG Ling,JIA Jun-Yan,LIU Xue-Jun,CAI Xiao-Bu.Atmospheric organic nitrogen deposition in Linzhi area, Tibet[J].Acta Ecologica Sinica,2009,29(10):5586-5591.
Authors:SHAO Wei  ZHANG Ying  SONG Ling  JIA Jun-Yan  LIU Xue-Jun  CAI Xiao-Bu
Abstract:Atmospheric nitrogen (N) deposition has been paid more and more attention due to the rapid increase of anthropogenic reactive N emissions. However, the information on atmospheric N deposition, especially the organic N deposition in Tibetan region, is still scarce. This paper reports the inputs and temporal variations of atmospheric organic N deposition in Linzhi area of Tibet from 2005 to 2007. Monthly volume\|weighted concentrations of organic N varied from 0.15 to 0.53 mg/L and was 0.21mg/L on average. Significantly higher concentrations were found in July and August in 2006, which were up to 1.26 mg/L. In different seasons, organic N concentrations were higher in spring and summer, while lower in autumn and winter. Monthly averaged organic N deposition was 0.50 kg/hm2. Positive relationships between organic N deposition and precipitation in every rain event can be fitted by linear equations (r=0.46-0.77) in the three monitoring years. And relationship between organic N deposition and precipitation in different seasons can be fitted by a power equation (r=0.99). Large part of the organic N deposition was concentrated in the summer time, June and July, 2006 and June, July and September, 2007. Averaged deposition in summer is 0.93 kg/hm2, accounting for 46% of the whole year's deposition. Generally, organic N deposition accounted for 62% of the total N deposition in the whole monitoring period, which can not be neglected as an important composing of atmospheric nitrogen.rainfall; Tibet
Keywords:nitrogen deposition  organic nitrogen  rainfall  Tibet
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