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	Recent trends of nitrogen flow of typical agro-ecosystems in China-major problems and potential solutions
	Liu C.; Li Y.; Li Y.
	2012
关键词	agro-ecosystem nitrogen flow field investigation human activity nitrogen use efficiency changjiang river
英文摘要	BACKGROUND: To diagnose problems that threaten regional sustainability and to devise appropriate treatment measures in China's agro-ecosystems, a study was carried out to quantify the nitrogen (N) flow in China's typical agro-ecosystems and develop potential solutions to the increasing environmental N load. RESULTS: The analysis showed that owing to human activity in the agro-ecosystems of Changjiang River Basin the mean total input of anthropogenic reactive N (i.e.chemical fertiliser, atmospheric deposition and bio-N fixation) increased from 4.41 x 10(9) kg-N in 1980 to 7.61 x 10(9) kg-N in 1990 and then to 1.43 x 10(10) kg-N in 2000, with chemical fertiliser N being the largest contributor to N load.Field investigation further showed that changes in human behaviour and rural urbanisation have caused rural communities to become more dependent on chemical fertilisers.In rural regions, around 4.17 kg-N of per capita annual potential N load as excrement was returned to farmlands and 1.38 kg-N directly discharged into river systems, while in urbanised regions, around 1.00 kg-N of per capita annual potential N load as excrement was returned to farmlands and 5.62 kg-N discharged into river systems in urban areas. CONCLUSION: The findings of the study suggest that human activities have significantly altered the N cycle in agro-ecosystems of China.With high population density and scarce per capita water resources, non-point source pollution from agro-ecosystems continues to put pressure on aquatic ecosystems.Increasing the rate of organic matter recycling and fertiliser efficiency with limited reliance on chemical fertilisers might yield tremendous environmental benefits. (C) 2011 Society of Chemical Industry
出处	Journal of the Science of Food and Agriculture
卷	92
期	5
页	1046-1053
收录类别	SCI
语种	英语
ISSN号	0022-5142
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/26861]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Liu C.,Li Y.,Li Y.. Recent trends of nitrogen flow of typical agro-ecosystems in China-major problems and potential solutions. 2012.

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