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学科主题: 生物科学::普通生物学
题名: Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau
作者: Zhao, JX (Zhao, Jingxue)1, 2; Li, RC (Li, Ruicheng)1; Li, X (Li, Xiang)2; Tian, LH (Tian, Lihua)3
通讯作者: Zhao, JX
关键词: CARBON-DIOXIDE EXCHANGE ; ECOSYSTEM CO2 EXCHANGE ; TEMPERATURE SENSITIVITY ; CLIMATE-CHANGE ; TERRESTRIAL ECOSYSTEMS ; MICROBIAL RESPIRATION ; SEMIARID GRASSLANDS ; TALLGRASS PRAIRIE ; GROWING-SEASON ; CHINA
刊名: CATENA
发表日期: 2017
DOI: 10.1016/j.catena.2017.08.007
卷: 159, 期:0, 页:84-92
收录类别: SCI
合作性质: 国内
文章类型: Article
类目[WOS]: Geosciences, Multidisciplinary; Soil Science; Water Resources ; Geology; Agriculture; Water Resources
研究领域[WOS]: Geology; Agriculture; Water Resources
英文摘要: Little is known about how environmental factors modify spatiotemporal variations of soil respiration (Rs) and its temperature sensitivity (Q(10)) in alpine grasslands on the Tibetan Plateau (TP). We conducted an altitudinal experiment across lower and upper limits of alpine meadows on the central TP. Soil respiration and related environmental factors were observed at each of 7 altitudes (from 4400 m to 5200 m) during the growing seasons of 2012 and 2013. Soil temperature (ST) rather than soil moisture (SM) was the major abiotic factor controlling seasonal variation of Rs in alpine grasslands across the seven altitudes. In addition to ST and SM, plant biomass is also an important factor controlling seasonal trends of Rs. The seasonal mean Rs increased with increasing altitude up to 4950 m, and then decreased above 4950 m. Below-ground biomass (BGB), ST and SM have direct effects on Rs, and the altitudinal trends of Rs can be well-predicated from these three variables (R-2 - 0.65). The Q(10) values of seasonal Rs generally increased with increasing altitude. Alpine meadows generally have higher Q(10) values comparing with steppe meadows. Along the altitude gradient, Q(10) was negatively correlated with ST, but positively correlated with SM, AGB, BGB and SOC. The results suggested that future climate warming would enhance Rs rates more dramatically in high-altitudes grasslands, and changes in vegetation structure under climate change might have a large impact on Rs in these alpine grasslands.
语种: 英语
WOS记录号: WOS:000412254700008
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7931
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Coll Urban & Environm Sci,Dept Ecol, Beijing 100871, Peoples R China.
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100101, Peoples R China.
3.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu 610041, Sichuan, Peoples R China.

Recommended Citation:
Zhao, JX ,Li, RC ,Li, X ,et al. Environmental controls on soil respiration in alpine meadow along a large altitudinal gradient on the central Tibetan Plateau[J]. CATENA,2017,159(0):84-92.
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