| 大气氮沉降向典型红壤区农田生态系统定量输入研究 |
| 摘要点击 3449 全文点击 1726 投稿时间：2008-09-28 修订日期：2008-12-22 |
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| 中文关键词 大气氮素 沉降速率 沉降通量 农田生态系统 |
| 英文关键词 atmospheric nitrogen deposition velocity deposition flux agro-ecosystem |
| DOI 10.13227/j.hjkx.20090807 |
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| 中文摘要 |
| 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NO-3-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. |
| 英文摘要 |
| The atmospheric nitrogen (N) deposition flux and dry deposition N velocities (Vd) were estimated using big leaf resistance 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 NO-3-N were the main settlement for gas and particle, respectively. NH3-N was made up 43.02% to 89.89% (mean value, 71.05%) of the gaseous N deposition while NO-3-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. |
