中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Changes in village-scale nitrogen storage in China's Tai Lake Region

文献类型:期刊论文

作者Ellis, EC; Li, RG; Yang, LZ; Cheng, X
刊名ECOLOGICAL APPLICATIONS
出版日期2000-08-01
卷号10期号:4页码:1074-1089
关键词agroecology anthropic soils anthropogenic ecosystems China ecological history land use landscape ecology sedimentation soil nitrogen sequestration soil organic matter sustainable agriculture wetlands
ISSN号1051-0761
通讯作者Ellis, EC()
英文摘要Long-term change in nitrogen storage in densely populated rural landscapes of China's Tai Lake Region was investigated by comparing soil and sediment N storage within an entire village ecosystem under traditional vs. contemporary management. Contemporary data were gathered on site from 1993 to 1996 by field surveying and sampling. Traditional period data, similar to 1930, were obtained from historical sources, interviews, and back estimation. N storage in the top 40 cm of soil and in low-density sediments (depth to density >1.3 g/cm(3)) was estimated within 35 village landscape components that were then aggregated into village-scale estimates and compared using Monte Carlo uncertainty analysis and a data quality index. Our results demonstrate with 76% probability that village soil and sediment N storage has increased from 1930 to 1994, most likely by 25% over the 1930s level, or similar to 1.4 Mg N/ha on average. A 20% increase in agricultural soil N concentrations caused more than half of the increase, potentially improving soil fertility. Sediment: accumulation in village canals, ponds, and marshes caused the remaining N storage increase, after sediment use for fertilizer ended in 1982, increasing the risk of flooding and impeding irrigation. Sedimentation at current rates will fill most canals within 25 years, and N concentration in agricultural soils may now be declining. Compounding these problems, village food security is threatened by a 30% decline in agricultural soil N per person since 1930 and a doubling in the proportion of village soil N under buildings and infrastructure, from 5% in 1930 to 11% in 1994. Village landscapes in the Tai Lake Region sequestered 1.7 Tg N and 16 Tg C between 1930 and 1994, forming a significant regional sink that may become a source of atmospheric C and N emissions, if organic N use continues to decline.
收录类别SCI
WOS关键词EMISSIONS ; WETLANDS ; QUALITY ; SOILS ; LAND
WOS研究方向Environmental Sciences & Ecology
WOS类目Ecology ; Environmental Sciences
语种英语
WOS记录号WOS:000088496000011
出版者ECOLOGICAL SOC AMER
URI标识http://www.irgrid.ac.cn/handle/1471x/2559122
专题南京土壤研究所
通讯作者Ellis, EC
作者单位1.China Agr Univ, Dept Agron & Agroecol, Beijing 100094, Peoples R China
2.Jiangsu Dept Agr & Forestry, Off Rural Energy & Environm Protect, Nanjing 210009, Jiangsu, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Soil Sci, Dept Ecol, Nanjing 210008, Jiangsu, Peoples R China
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Ellis, EC,Li, RG,Yang, LZ,et al. Changes in village-scale nitrogen storage in China's Tai Lake Region[J]. ECOLOGICAL APPLICATIONS,2000,10(4):1074-1089.
APA Ellis, EC,Li, RG,Yang, LZ,&Cheng, X.(2000).Changes in village-scale nitrogen storage in China's Tai Lake Region.ECOLOGICAL APPLICATIONS,10(4),1074-1089.
MLA Ellis, EC,et al."Changes in village-scale nitrogen storage in China's Tai Lake Region".ECOLOGICAL APPLICATIONS 10.4(2000):1074-1089.

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来源:南京土壤研究所

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