缙云山大气氮湿沉降组成及其变化特征  

Composition and temporal variation of atmospheric nitrogen wet deposition in Jinyun Mountain,southwestern China

作　　者：孙素琪[1] 王云琦[1] 王玉杰[1] 张会兰[1] 于雷[1] 唐晓芬[1] 朱锦奇[1] 周彬 

机构地区：[1]北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室 [2]重庆缙云山国家级自然保护区管理局

出　　处：《北京林业大学学报》2013年第4期47-54,共8页Journal of Beijing Forestry University

基　　金：高等学校博士学科点专项科研基金(20110014120001);国家自然科学基金项目(31100515)

摘　　要：采用APS-2A型降水降尘自动采集仪,定位收集2012年5—10月重庆缙云山自然保护站的湿沉降数据,分析该地区大气氮湿沉降浓度及沉降的组成、月变化及季节变化。结果表明:1)相对于NO-3-N和DON(可溶性有机氮),降雨中NH+4-N的质量浓度较高,说明该地区NH3的排放量较高;2)缙云山地区大气活性氮主要是还原态的NH+4-N,其主要来源于农业生产;3)监测期内湿沉降中NO-3-N、NH+4-N和DON的平均质量浓度分别为(0.441±0.304)、(0.821±0.480)和(0.203±0.211)mg/L,3种形态氮的月平均质量浓度排序为NH+4-N>NO-3-N>DON;4)NO-3-N、NH+4-N和DON的最大沉降量均出现在5月,其平均湿沉降量分别为(0.642±0.292)、(1.273±0.739)和(0.329±0.231)kg/hm2,占总氮湿沉降量的比例分别是29.76%、56.27%和13.98%;5)氮质量浓度与降雨量、降雨强度之间的相关关系均很弱,而氮湿沉降量与降雨量之间呈显著的线性相关关系(P<0.01),说明该地区氮湿沉降量主要受降雨量的影响,但是降雨量、降雨强度对氮质量浓度的影响都很小。Field observation of nitrogen wet deposition in Jinyun Mountain, the natural conservation station of southwestern China, was fixed collected by APS-2A precipitation-dust automatic acquisition instrument from May to October 2012, based on which the composition, monthly and seasonal variation of nitrogen wet deposition were analyzed. Results showed that ： 1 ） the concentration of NH4 -N was higher than that of NO3--N and DON （dissolved organic nitrogen） , indicating that emission load of NH3 within this area was generally high; 2） the major form of atmospheric reactive nitrogen in Jinyun Mountain area was reduced nitrogen NH4-N, which primarily came from agricultural productivity; 3 ） the average concentrations of NO3-N, NH4 -N and DON in precipitation were （0. 441 ± 0. 304 ）, （0. 821 ± 0. 480 ） and （0. 203± 0. 211 ） mg/L during the monitoring period, respectively, of which the above three nitrogen forms ranked in NH4 -N 〉 NO3- -N 〉 DON ; 4） the highest concentrations of NO3- -N, NH4 -N and DON all occurred in May, and the average values were （0.642 ±0.292）, （1.273±0.739） and （0.329± 0. 231） kg/hm2, accounted for 29.76%, 56.27% and 13.98% of the total nitrogen wet deposition, respectively; 5） nitrogen concentration was weakly correlated with rainfall and rainfall intensity, while the total nitrogen wet deposition presented an obvious linear correlation with the precipitation amount （P 〈 0.01 ） , which demonstrates that nitrogen wet deposition is mainly affected by rainfall, but rainfall and rainfall intensity have little impact on N concentration.

关 键 词：氮质量浓度 氮湿沉降 缙云山 

分 类 号：S718.512.1[农业科学—林学]