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Position: Home > Articles > N biogeochemical cycle and its impacts on environments in an agro-forest ecosystem. Chinese Journal of Eco-Agriculture 2005,13 (1)

农林复合生态系统氮素生物地球化学循环及其环境影响研究

作  者:
彭奎;欧阳华;朱波
单  位:
中国科学院成都山地灾害与环境研究所;中国科学院地理科学与资源研究所
关键词:
农林复合系统;N素收支平衡;生物地球化学;非点源污染
摘  要:
对长江上游典型农林复合生态系统N素收支平衡及其污染特征研究结果表明 ,农林复合生态系统旱地N素盈余相对较多 ,水田基本平衡 ,而林地有较大亏缺。N素收支平衡评价表明其旱地平衡合理 ,水田平衡略高 ,但整个农田N素已由 2 0世纪 6 0年代严重亏缺达到目前的较合理水平 ;大规模造林以及水保耕作措施对农田N素合理分配均产生重要影响。但化肥施用量剧增已导致农田气态N素释放量增加和水体非点源污染风险加大。
译  名:
N biogeochemical cycle and its impacts on environments in an agro-forest ecosystem.
作  者:
PENG Kui,OUYANG Hua(In stitute of Geographical Sciences and Nat ural Resources Research,Chinese Academy of Sciences,Beijing 100101),ZHU Bo(Cheng du Institute of Mountain Hazards and Env ironment,Chinese Academy of Sciences,Che ngdu 610041)
关键词:
Agro -forest eco system,N balance,Biogeochemistry,Non -point source pollution
摘  要:
The N balance and its pollution characteristics on enviro nments in a typical agro -forestry ecosy stem in the upper reaches of the Yangtze River were studied.The results show tha t in ecosystem,there is relatively high N surplus in croplands,almost N balance in paddies and high N deficit in forest. N balance appraisals show the N balance rate of croplands is reasonable but that of paddies shows a little higher.Howeve r,N balance of the whole arable lands ha s changed greatly from heavy deficit of 1960s to reasonable balance of nowadays. Forest and cultivations play the importa nt roles in the N balance changes of eco system.But the great increases of chemic al N fertilizer usages lead to the incre asing of the gas N emissions and N non -p oint source pollutions risk of water bod ies.

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