鄂西北丹江口库区大气氮沉降  

Atmospheric nitrogen deposition in Danjiangkou Reservoir area of Northwest Hubei

作　　者：刘冬碧[1] 张小勇[2] 巴瑞先[1] 刘毅[3] 范先鹏[1] 张富林[1] 熊桂云[1] 

机构地区：[1]湖北省农业科学院植保土肥研究所,武汉430064 [2]湖北省烟草公司襄阳市公司,襄阳441003 [3]中国科学院武汉植物园,武汉430074

出　　处：《生态学报》2015年第10期3419-3427,共9页Acta Ecologica Sinica

基　　金：国家科技支撑计划课题(2012BAD15B01);湖北省农业科学院青年基金(2011NKYJJ09);湖北省自然科学基金(2011CBD119)

摘　　要：利用雨量器在鄂西北丹江口库区连续3a采集降雨样品,研究了大气氮沉降的变化动态。结果表明:2009—2011年月均总氮(TN)浓度为3.70—10.36 mg/L,与当月降雨量呈极显著线性负相关(R=-0.592**,n=32),季均TN浓度为冬季(8.21 mg/L)>春季(3.94 mg/L)>秋季(3.23 mg/L)>夏季(2.70 mg/L),年均TN浓度为3.70 mg/L。大气氮素年均干湿总沉降量为26.53 kg/hm2,其中干沉降为7.80 kg/hm2,占总沉降量的29.4%;湿沉降为18.73 kg/hm2,占总沉降量的70.6%。干沉降中铵态氮(NH+4-N)、硝态氮(NO-3-N)、可溶性有机氮(DON)和颗粒态氮(PN)分别占TN的22.1%、16.8%、37.2%和23.9%,湿沉降中它们分别为TN的36.6%、34.4%、12.9%和16.1%。Atmospheric nitrogen （N） deposition includes wet and dry deposition of both inorganic and organic, or dissoluble and particle N forms. For agricultural ecosystem, atmospheric N deposition is an important way by which the lost N from the soil-plant system goes back to the agricultural fields. Whereas increasing atmospheric N deposition may not only affect human and ecosystem health, greenhouse gas balance and biodiversity, but also become one of the important causes of surface water eutrophication. Since the beginning of this century, the atmospheric N deposition and its effects on agricultural land, forestry, grasslands, watershed and city ecosystems were all conducted in China. However, information on the magnitude and environmental impact of N deposition in China is still limited. Danjiangkou Reservoir, which locates where the Hubei and Henan provinces meet and has a drainage area of 95200 km2, is the source of water for the Middle Route Project which is part of the South-to-North Water Transfer Scheme. Recent monitored results showed that, high concentration of total N in some branch catchment rivers is one of the main water environment problems facing Danjiangkou Reservoir. However, the atmospheric N deposition and its effects on water quality in this area are not clear. In this study, the atmospheric N deposition in Danjiangkou Reservoir area of northwest Hubei province from 2009 to 2011 was monitored. Results showed that, the monthly averaged concentration of total nitrogen （TN） in bulk atmospheric deposition ranged from （3.70±0.89） mg/L to （10.36±10.68） mg/L,which was significantly negatively correlated to the corresponding monthly rainfall （R=-0.592＊ ＊,n=32）. The seasonal averaged concentration of TN was ordered as： Winter （（8.21±2.71） mg/L） 〉 Spring （（3.94±1.99） mg/L） 〉 Autumn （（3.23±1.52） mg/L） 〉 Summer （（2.70±0.72） mg/L）. The annual averaged concentration of TN was （3.70±0.93） mg/L. The bulk atmospheric TN deposition rates from

关 键 词：大气氮沉降 干沉降 湿沉降 氮形态 丹江口库区 

分 类 号：X51[环境科学与工程—环境工程]