Effects of experimental warming on soil respiration and its components in an alpine meadow in the permafrost region of the Qinghai‐Tibet Plateau

European Journal of Soil Science - Tập 66 Số 1 - Trang 145-154 - 2015
Fei Peng1, Quangang You2,1, Mingxiang Xu1, Xuhui Zhou3, Tao Wang1, Jiawei Guo1, Xian Xue1
1Key Laboratory of Desert and Desertification Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences West Donggang Road Lanzhou 730000 China
2College of Natural Resources and Environment University of Chinese Academy of Sciences Yuquanlu Beijing 100049 China
3Coastal Ecosystems Research Station of Yangtze River Estuary, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, The Institute of Biodiversity Science School of Life Sciences, Fudan University 220 Handan Road Shanghai 200433 China

Tóm tắt

SummaryThe response of soil respiration (Rs) and its components (autotrophic [Ra] and heterotrophic respiration [Rh]) to climate warming is one of the uncertainties in ecosystem carbon (C) models. Here we conducted a warming experiment in an alpine meadow dominated by Koresbia in the permafrost region of the Qinghai‐Tibet Plateau (QTP) to examine effects of warming on Rs and its components. Infrared heaters were used to simulate a 2°C warming of the surface soil temperature. Deep collars (50 cm to exclude root growth) were inserted into soil to measure Rh: Ra, which was calculated by subtracting Rh from Rs. Average Rs and its components (Ra and Rh) were significantly stimulated by 21.5, 27 and 15.6%, respectively, in warmed plots from January 2011 to October 2013. The contribution of Rh to Rs decreased in the warmed plots because of the smaller relative increase in Rh than in Ra. Annual soil C release increased by 263 and 247 g C m−2 in 2011 and 2012, respectively. Stimulation in Ra and Rh was related to the significant increase in root biomass (0–50 cm) and in labile soil C in the deeper layer (40–50 cm). The temperature sensitivities (Q10) of Rs and its components all increased with larger values in Ra, followed by Rs and Rh. Our results suggest a positive feedback between soil C release and climatic warming in the permafrost region of the QTP.

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Tài liệu tham khảo

10.1007/s10021-008-9198-0

10.1071/AR9951459

10.1038/nature08930

10.1111/j.1365-2486.2004.00816.x

10.1038/25119

10.1111/j.1461-0248.2008.01219.x

10.1111/j.1469-8137.2007.02122.x

10.1175/JCLI3800.1

10.1111/j.1365-2486.2008.01827.x

10.1126/science.279.5348.214

10.1023/A:1006244819642

10.1093/treephys/25.9.1187

10.1073/pnas.1103910108

10.1007/s10533-005-2237-4

10.1016/j.soilbio.2011.01.009

10.1111/gcb.12273

10.1023/A:1004883221036

10.1016/j.agrformet.2011.01.009

Lu Z., 2006, Heat and water difference of active layers beneath different surface conditions near Beiluhe in Qinghai‐Xizang Plateau, Journal of Glaciology & Geocryology, 28, 642

10.1038/35098065

10.1038/ngeo1573

10.1034/j.1600-0889.1992.t01-1-00001.x

10.1890/1051-0761(1997)007[0444:RONLET]2.0.CO;2

10.1046/j.1365-2486.1999.00216.x

10.1111/j.1600-0889.2011.00527.x

10.1029/94GB00993

10.1111/j.1365-2486.2008.01757.x

10.1023/A:1006247623877

10.1038/nature08031

10.1038/nature12129

10.1111/j.1365-2486.2006.01117.x

10.1890/12-0150.1

10.1007/s00374-009-0413-8

10.1016/j.catena.2007.01.001

Wang S., 1999, Studying carbon storage spatial distribution of terrestrial natural vegetation in China, Progress in Geography, 18, 238

10.1016/S0165-232X(03)00064-8

10.1111/j.1365-2486.2010.02302.x

10.1111/j.1365-2486.2008.01807.x

10.1657/1938-4246-46.2.441

10.1111/j.1654-1103.2009.05566.x

10.1016/j.soilbio.2008.12.026

10.1111/j.1365-2486.2007.01333.x

10.1111/j.1469-8137.2010.03256.x

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European Journal of Soil Science

Tập 66 Số 1

145-154

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