Knowledge Management System of Northwest Institute of Plateau Biology, CAS
| Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau | |
| Hu, Yigang2,4; Chang, Xiaofeng2,4; Lin, Xingwu3; Wang, Yanfen4; Wang, Shiping1,2; Duan, Jichuang2,4; Zhang, Zhenhua2,4; Yang, Xiaoxia2,4; Luo, Caiyun2,4; Xu, Guangping2,4; Zhao, Xinquan2 | |
| 2010-06-01 | |
| 发表期刊 | SOIL BIOLOGY & BIOCHEMISTRY
 |
| ISSN | 0038-0717 |
| 卷号 | 42期号:6页码:944-952 |
| 文章类型 | Article |
| 摘要 | A great deal of uncertainty is associated with estimates of global nitrous oxide (N2O) emissions because emissions from arid and polar climates were not included in the estimates due to a lack of available data. In particular, very few studies have assessed the response of N2O flux to grazing under future warming conditions. This experiment was conducted to determine the effects of warming and grazing on N2O flux at different time scales for three years under a controlled warming-grazing system. A free-air temperature enhancement system (FATE) using infrared heaters and grazing significantly increased soil temperatures for both of growing (average 1.8 C in 2008) and no-growing seasons (average 3.0 C for 3-years) within 20-cm depth, but only warming reduced soil moisture at 10-cm soil depth during the growing season during the drought year of 2008. Generally, the effects of warming and grazing on N2O flux varied with sampling date, season, and year. No interactive effect between warming and grazing was found. Warming did not affect annual N2O flux when grazing was moderate during the growing season because the tradeoff of the effect of warming on N2O flux was observed between the growing season and no-growing season. No-warming with grazing (NWG) and warming with grazing (WG) significantly increased the average annual N2O flux (57.8 and 31.0%) compared with no-warming with no-grazing (NWNG) and warming with no-grazing (WNG), respectively, indicating that warming reduced the response of N2O flux to grazing in the region. Winter accounted for 36e57% of annual N2O flux for NWNG and NWG, whereas only for 5e8% of annual N2O flux for WNG and WG. Soil temperature could explain 5e35% of annual N2O flux variation.; A great deal of uncertainty is associated with estimates of global nitrous oxide (N2O) emissions because emissions from arid and polar climates were not included in the estimates due to a lack of available data. In particular, very few studies have assessed the response of N2O flux to grazing under future warming conditions. This experiment was conducted to determine the effects of warming and grazing on N2O flux at different time scales for three years under a controlled warming-grazing system. A free-air temperature enhancement system (FATE) using infrared heaters and grazing significantly increased soil temperatures for both of growing (average 1.8 degrees C in 2008) and no-growing seasons (average 3.0 degrees C for 3-years) within 20-cm depth, but only warming reduced soil moisture at 10-cm soil depth during the growing season during the drought year of 2008. Generally, the effects of warming and grazing on N2O flux varied with sampling date, season, and year. No interactive effect between warming and grazing was found. Warming did not affect annual N2O flux when grazing was moderate during the growing season because the tradeoff of the effect of warming on N2O flux was observed between the growing season and no-growing season. No-warming with grazing (NWG) and warming with grazing (WG) significantly increased the average annual N2O flux (57.8 and 31.0%) compared with no-warming with no-grazing (NWNG) and warming with no-grazing (WNG), respectively, indicating that warming reduced the response of N2O flux to grazing in the region. Winter accounted for 36-57% of annual N2O flux for NWNG and NWG, whereas only for 5-8% of annual N2O flux for WNG and WG. Soil temperature could explain 5-35% of annual N2O flux variation. (C) 2010 Elsevier Ltd. All rights reserved. |
| 关键词 | Global Warming Grazing N2o Flux Soil Temperature Soil Moisture Alpine Meadow Fate Tibetan Plateau |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| 关键词[WOS] | NITROUS-OXIDE EMISSIONS ; COLORADO SHORTGRASS STEPPE ; SOIL-ATMOSPHERE EXCHANGE ; INNER-MONGOLIA ; FREEZE-THAW ; FOREST SOILS ; INTERANNUAL VARIATIONS ; SEMIARID GRASSLAND ; AGRICULTURAL SOIL ; CARBON-DIOXIDE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Agriculture |
| WOS类目 | Soil Science |
| WOS记录号 | WOS:000277814700010 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://210.75.249.4/handle/363003/2028 |
| 专题 | 中国科学院西北高原生物研究所 |
| 作者单位 | 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China 2.Chinese Acad Sci, NW Inst Plateau Biol, Haibei Alpine Meadow Ecosyst Res Stn, Key Lab Adaptat & Evolut Plateau Biota, Xining 810008, Peoples R China 3.Inst Soil Sci, Nanjing 21008, Peoples R China 4.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Yigang,Chang, Xiaofeng,Lin, Xingwu,et al. Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau[J]. SOIL BIOLOGY & BIOCHEMISTRY,2010,42(6):944-952. |
| APA | Hu, Yigang.,Chang, Xiaofeng.,Lin, Xingwu.,Wang, Yanfen.,Wang, Shiping.,...&Zhao, Xinquan.(2010).Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau.SOIL BIOLOGY & BIOCHEMISTRY,42(6),944-952. |
| MLA | Hu, Yigang,et al."Effects of warming and grazing on N2O fluxes in an alpine meadow ecosystem on the Tibetan plateau".SOIL BIOLOGY & BIOCHEMISTRY 42.6(2010):944-952. |
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