北江流域氮收支估算  

Nitrogen Budgets of the Beijiang River Basin

作　　者：陈法锦[1,2] 贾国东[1] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广州510640 [2]中国科学院研究生院,北京100039

出　　处：《热带地理》2009年第1期11-15,共5页Tropical Geography

基　　金：广东省自然科学基金项目(04002136)

摘　　要：根据2006年北江流域的基本统计数据和相关参数,对该地区氮的收支进行了估算和环境影响分析。2006年北江流域的氮输入量为39.52×104t,单位国土面积接收的氮量为84.61kg/hm2·a,稍高于全国和长江流域,也高于世界一些大河流域。在氮的输出中,约38.61﹪的氮通过珠江口输送到中国南海,27.80﹪的氮通过反硝化和9.13﹪的氮通过氨挥发进入大气,剩余24.46﹪的氮储存在流域内。研究发现,北江流域的主要氮输入源均与农业活动有关,氮输入源分布的地区差异较大,单位面积接收总氮量主要受经济发达程度的影响。By using the basic statistics in 2006 and some related parameters, the nitrogen budgets of the Beijiang River Basin was estimated and its environmental effects were discussed. The total N input to the Beijiang River Basin was approximately 39.52×10^4 tons a year, or 84.61 kg/hm^2·a. The flux is higher than those of other river basins in China, including the Changjiang river basin, and some large river basins in the world. In terms of N output, about 38.61% of the total N input was transported into the South China Sea through the outlets of the river, while some 27.80% of the input was emitted by denitrification and 9.13% by volatilization, and the remaining 24.46 % was stored within the basin. The estimation shows that the main N sources in the Beijiang River Basin were related to agricultural practice, although the N sources varied greatly in different sub-regions, it was caused by different development levels between them.

关 键 词：北江流域 氮收支 环境影响 

分 类 号：X144[环境科学与工程—环境科学]