摘要
采集了我国7个站点的降雨和森林穿冠水样品,分析测定了水样中硝态氮和总氮的同位素丰度.降雨中硝态氮δ15N值范围为-9.00‰至9.71‰,其中北方站点冬季降雨中硝态氮δ15N值要远高于其他站点,可能是由于北方冬季燃煤供暖所致.穿冠水中硝态氮δ15N值范围为-16.59‰至-0.32‰,比降雨中的硝态氮δ15N值要低,其可能原因是林冠层中存在硝态氮的交换过程,从而产生了分馏作用.降雨和穿冠水中TN的δ15N值范围分别为-7.94‰至-3.07‰和-4.55‰至-1.73‰,其中穿冠水中TN的δ15N值要略高于降雨中的值.
In this paper,we collected rainfall and throughfall samples from seven sites in China,and measured the δ15N values of nitrate and total nitrogen.In rainfall,the δ15N values of nitrate ranged from-9.00‰ to 9.71‰,showing higher valves at BJ（9.71‰） and CBS（7.69‰） than at the other sites.This could be attributed to coal combustion for heating in winter season in northern China,as the δ15N values of emitted NOx from coal combustion usually ranges from 6‰ to 13‰.In throughfall,the δ15N values of nitrate are in a range from-16.59‰ to-0.32‰,lower than in rainfall,which is probably due to the fractionation during the exchanging process of nitrate in canopy.The δ15N values of TN in rainfall and throughfall are from-7.94‰ to-3.07‰ and-4.55‰ to-1.73‰ respectively,and the values in throughfall are comparatively higher.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第8期1481-1485,共5页
Environmental Chemistry
基金
中国科学院知识创新方向性项目(K2CX2-YW-GJ01)
中国科学院国际合作项目(GJHZ1205)
国家重大基础研究(973计划)项目(2005CB422206)资助
关键词
降雨
穿冠水
硝态氮
δ15N
rainfall
throughfall
nitrate nitrogen
δ15N
