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题名: Effect of warming and grazing on litter mass loss and temperature sensitivity of litter and dung mass loss on the Tibetan plateau
作者: Luo, Caiyun1, 2; Xu, Guangping1, 2; Chao, Zengguo1, 2; Wang, Shiping1; Lin, Xingwu3; Hu, Yigang1, 2; Zhang, Zhenhua1, 2; Duan, Jichuang1, 2; Chang, Xiaofeng1, 2; Su, Ailing1, 2; Li, Yingnian1; Zhao, Xinquan1; Du, Mingyuan4; Tang, Yanghong5; Kimball, Bruce6
刊名: GLOBAL CHANGE BIOLOGY
出版日期: 2010-05-01
卷号: 16, 期号:5, 页码:1606-1617
关键词: alpine meadow ; climate change ; decomposition ; dung ; global change ; grazing ; infrared ; litter ; temperature sensitivity ; warming
文章类型: Article
中文摘要: Knowledge about the role of litter and dung decomposition in nutrient cycling and response to climate change and grazing in alpine ecosystems is still rudimentary. We conducted two separate studies to assess the relative role of warming and grazing on litter mass loss and on the temperature sensitivity of litter and dung mass loss. Experiments were conducted for 1-2 years under a controlled warming-grazing system and along an elevation gradient from 3200 to 3800 m. A free-air temperature enhancement system (FATE) using infrared heaters and grazing significantly increased soil temperatures (average 0.5-1.6 degrees C) from 0 to 40 cm depth, but neither warming nor grazing affected soil moisture except early in the growing seasons at 30 cm soil depth. Heaters caused greater soil warming at night-time compared with daytime, but grazing resulted in greater soil warming during daytime compared with night-time. Annual average values of the soil temperature at 5 cm were 3.2, 2.4 and 0.3 degrees C at 3200, 3600 and 3800 m, respectively. Neither warming nor grazing caused changes of litter quality for the first year of the controlled warming-grazing experiment. The effects of warming and grazing on litter mass losses were additive, increasing litter mass losses by about 19.3% and 8.3%, respectively, for the 2-year decomposition periods. The temperature sensitivity of litter mass losses was approximately 11% degrees C-1 based on the controlled warming-grazing experiment. The annual cumulative litter mass loss was approximately 2.5 times that of dung along the elevation gradient. However, the temperature sensitivity (about 18% degrees C-1) of the dung mass loss was about three times that of the litter mass loss. These results suggest greater warming at night-time compared with daytime may accelerate litter mass loss, and grazing will enhance carbon loss to atmosphere in the region through a decrease of litter biomass and an increase of dung production with an increase of stocking rate in future warmer conditions.
英文摘要: Knowledge about the role of litter and dung decomposition in nutrient cycling and response to climate change and grazing in alpine ecosystems is still rudimentary. We conducted two separate studies to assess the relative role of warming and grazing on litter mass loss and on the temperature sensitivity of litter and dung mass loss. Experiments were conducted for 1-2 years under a controlled warming-grazing system and along an elevation gradient from 3200 to 3800 m. A free-air temperature enhancement system (FATE) using infrared heaters and grazing significantly increased soil temperatures (average 0.5-1.6 degrees C) from 0 to 40 cm depth, but neither warming nor grazing affected soil moisture except early in the growing seasons at 30 cm soil depth. Heaters caused greater soil warming at night-time compared with daytime, but grazing resulted in greater soil warming during daytime compared with night-time. Annual average values of the soil temperature at 5 cm were 3.2, 2.4 and 0.3 degrees C at 3200, 3600 and 3800 m, respectively. Neither warming nor grazing caused changes of litter quality for the first year of the controlled warming-grazing experiment. The effects of warming and grazing on litter mass losses were additive, increasing litter mass losses by about 19.3% and 8.3%, respectively, for the 2-year decomposition periods. The temperature sensitivity of litter mass losses was approximately 11% degrees C-1 based on the controlled warming-grazing experiment. The annual cumulative litter mass loss was approximately 2.5 times that of dung along the elevation gradient. However, the temperature sensitivity (about 18% degrees C-1) of the dung mass loss was about three times that of the litter mass loss. These results suggest greater warming at night-time compared with daytime may accelerate litter mass loss, and grazing will enhance carbon loss to atmosphere in the region through a decrease of litter biomass and an increase of dung production with an increase of stocking rate in future warmer conditions.
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Biodiversity Conservation ; Ecology ; Environmental Sciences
研究领域[WOS]: Biodiversity & Conservation ; Environmental Sciences & Ecology
关键词[WOS]: SOIL-NITROGEN AVAILABILITY ; LEAF-LITTER ; DECOMPOSITION RATES ; CLIMATE-CHANGE ; TERRESTRIAL ECOSYSTEMS ; ORGANIC-CARBON ; LIGNIN CONTROL ; ARCTIC TUNDRA ; FOREST LITTER ; COLD BIOMES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000276696100015
Citation statistics:
内容类型: 期刊论文
URI标识: http://210.75.249.4/handle/363003/1718
Appears in Collections:中国科学院西北高原生物研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, NW Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810008, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
4.Natl Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan
5.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan
6.ARS, US Arid Land Agr Res Ctr, USDA, Maricopa, AZ 85238 USA

Recommended Citation:
Luo, CY; Xu, GP; Chao, ZG; Wang, SP; Lin, XW; Hu, YG; Zhang, ZH; Duan, JC; Chang, XF; Su, AL; Li, YN; Zhao, XQ; Du, MY; Tang, YH; Kimball, B.Effect of warming and grazing on litter mass loss and temperature sensitivity of litter and dung mass loss on the Tibetan plateau,GLOBAL CHANGE BIOLOGY,2010,16(5):1606-1617
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文件名: Effect of warming and grazing on litter mass loss and temperature sensitivity of litter and dung mass loss on the Tibetan plateau.pdf
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