摘要
在2005年,通过对中国科学院红壤生态实验站(江西鹰潭)内农田小气候要素和湍流的观测及大气和雨水中氮化物的分析,借助大叶阻力相似模型,研究了大气氮素(N)通过干、湿沉降输入研究地农田生态系统的N通量.结果表明,全年通过大气沉降向该农田生态系统输入N 132.6 kg.hm-2,其中干沉降输入N 82.63 kg.hm-2,占大气总输入N的67.94%.干沉降过程中,气体中以NH3-N沉降为主,占气态N沉降的43.02%~89.89%(均值为71.05%);颗粒中以NO3--N为主,占颗粒态N的33.67%~94.54%(均值为61.01%).每月通过湿沉降(雨水)输入N 0.50~8.45 kg.hm-2,以7月和11月较高.
The atmospheric nitrogen （N） deposition flux and dry deposition N velocities （Vd） were estimated using big leaf resistanee analogy model by observations of onflow and factors of farmland microclimate, analysis of nitrides from the atmosphere and rain in an agro-ecosystem, a typical red soil region on Experiment Station of Red Earth Ecology, Chinese Academy （Yingtan, Jiangxi） of Sciences in 2005. The results showed that the dry deposition N was 82.63 kg·hm^-2 , accounting for 67.94% of the total N, which was 132.6 kg·hm^-2 in the whole year （2005）. In N dry deposition progress, NH3-N and NOr -N were the main settlement for gas and particle, respectively. NH^-N was made up 43.02% to 89.89% （mean value, 71.05% ） of the gaseous N deposition while NOr -N was accounted for 33.67% to 94.54% （mean value, 61.01% ） of the particle N deposition. The N wet deposition fluxes were 0.50-8.45 kg·hm^-2 per month and reached the higher value in July and November.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第8期2221-2226,共6页
Environmental Science
基金
中国科学院知识创新领域前沿项目(ISSASIP0730)
中国科学院知识创新工程项目(KSCXI-YW-09-08)
中国科学院知识创新项目(KZCX2-YW-Y417)
关键词
大气氮素
沉降速率
沉降通量
农田生态系统
atmospheric nitrogen
deposition velocity
deposition flux
agro- ecosystem
