Arid
DOI10.1007/s10533-008-9197-4
Impacts of grazing intensity on denitrification and N(2)O production in a semi-arid grassland ecosystem
Xu, Yuqing1,2; Wan, Shiqiang1; Cheng, Weixin1,3; Li, Linghao1
通讯作者Li, Linghao
来源期刊BIOGEOCHEMISTRY
ISSN0168-2563
出版年2008
卷号88期号:2页码:103-115
英文摘要

N(2)O production from denitrification in soils contributes to the enhanced greenhouse effect and the destruction of the stratospheric ozone. Ungulate grazing affects denitrification and the production of N(2)O. The short-term effect of grazing on denitrification and N(2)O production has been examined in several grassland ecosystems. However, the effects of long-term grazing have rarely been studied. We measured denitrification and N(2)O production during the 2005 and 2006 growing seasons in a long-term (17 years) experiment that had five grazing intensities (GI; 0.00, 1.33, 2.67, 4.00 and 5.33 sheep ha(-1)). We found that denitrification and N(2)O production rates were seasonally variable during the measurement period, with higher values observed in summer and lower values found in spring and autumn. The grazed treatments resulted in decreased denitrification and N(2)O production, primarily due to the reduced soil nitrate concentration and organic N content under the long-term grazing. This supported our hypothesis that long-term over-grazing suppresses denitrification and N(2)O production. Although significant differences in denitrification and N(2)O production were not found between the four GI, there was a general trend that cumulative denitrification and N(2)O production decreased as grazing intensity increased, especially in 2006. Lower N losses via denitrification and N(2)O production in the grazed plots, to some extent, may contribute to the mitigation of greenhouse gas emission and help to preserve soil N and ameliorate the negative impacts of grazing on plant growth, productivity, and ecological restoration processes in the temperate steppe in northern China.


英文关键词denitrification N(2)O production grazing intensity temperate steppe
类型Article
语种英语
国家Peoples R China ; USA
收录类别SCI-E
WOS记录号WOS:000256264000001
WOS关键词NITROUS-OXIDE ; ACETYLENE-INHIBITION ; DESERT ECOSYSTEM ; N MINERALIZATION ; INNER-MONGOLIA ; SOIL ; PASTURE ; NITRIFICATION ; NITRATE ; STIMULATION
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/156664
作者单位1.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing 100093, Peoples R China;
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China;
3.Univ Calif Santa Cruz, Dept Environm Studies, Santa Cruz, CA 95064 USA
推荐引用方式
GB/T 7714
Xu, Yuqing,Wan, Shiqiang,Cheng, Weixin,et al. Impacts of grazing intensity on denitrification and N(2)O production in a semi-arid grassland ecosystem[J],2008,88(2):103-115.
APA Xu, Yuqing,Wan, Shiqiang,Cheng, Weixin,&Li, Linghao.(2008).Impacts of grazing intensity on denitrification and N(2)O production in a semi-arid grassland ecosystem.BIOGEOCHEMISTRY,88(2),103-115.
MLA Xu, Yuqing,et al."Impacts of grazing intensity on denitrification and N(2)O production in a semi-arid grassland ecosystem".BIOGEOCHEMISTRY 88.2(2008):103-115.
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