globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13465
论文题名:
Biotic degradation at night, abiotic degradation at day: positive feedbacks on litter decomposition in drylands
作者: Gliksman D.; Rey A.; Seligmann R.; Dumbur R.; Sperling O.; Navon Y.; Haenel S.; De Angelis P.; Arnone J.A.; III; Grünzweig J.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:4
起始页码: 1564
结束页码: 1574
语种: 英语
英文关键词: dew ; facilitation ; litter CO2 flux ; litter decomposition ; litter moisture-content ; microbial degradation ; microbial priming ; photodegradation ; relative humidity ; semi-arid ecosystems
英文摘要: The arid and semi-arid drylands of the world are increasingly recognized for their role in the terrestrial net carbon dioxide (CO2) uptake, which depends largely on plant litter decomposition and the subsequent release of CO2 back to the atmosphere. Observed decomposition rates in drylands are higher than predictions by biogeochemical models, which are traditionally based on microbial (biotic) degradation enabled by precipitation as the main mechanism of litter decomposition. Consequently, recent research in drylands has focused on abiotic mechanisms, mainly photochemical and thermal degradation, but they only partly explain litter decomposition under dry conditions, suggesting the operation of an additional mechanism. Here we show that in the absence of precipitation, absorption of dew and water vapor by litter in the field enables microbial degradation at night. By experimentally manipulating solar irradiance and nighttime air humidity, we estimated that most of the litter CO2 efflux and decay occurring in the dry season was due to nighttime microbial degradation, with considerable additional contributions from photochemical and thermal degradation during the daytime. In a complementary study, at three sites across the Mediterranean Basin, litter CO2 efflux was largely explained by litter moisture driving microbial degradation and ultraviolet radiation driving photodegradation. We further observed mutual enhancement of microbial activity and photodegradation at a daily scale. Identifying the interplay of decay mechanisms enhances our understanding of carbon turnover in drylands, which should improve the predictions of the long-term trend of global carbon sequestration. © 2016 John Wiley & Sons Ltd
资助项目: We acknowledge the Ramat Hanadiv team for the administrative expertise and technical assistance, the Yitzhak Hadar laboratory for their assistance with gas-chromatography measurement, Andreas Fangmeier for help with stable isotope and elemental analyses, Shabtai Cohen for support with climate monitoring, Terry Chapin and Efrat Sheffer for helpful comments to the manuscript, and Avner Zinger, Dor Amper, Hen Karo, Meron Berniker, Mor Ashkenazi, Nili Bruckenthal, and Ohad Abramovich for field and laboratory assistance. This research project was financially supported by the United States-Israel Binational Science Foundation (BSF), the Jewish National Fund (KKL), the Ring Family Foundation, a Transnational Access Project of INCREASE (An Integrated Network on Climate Research Activities on Shrubland Ecosystems) and the Spanish Ministry of Economy and Competitiveness (project CGL2011-24748/PHOTODEG). The authors declare no conflict of interest.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61008
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作者单位: Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot, Israel; Department of Biogeography and Global Change, National Museum of Natural History, Spanish Scientific Council (CSIC), C/Serrano 115bis, Madrid, Spain; Department of Plant Sciences, University of California, Davis, CA, United States; Ramat Hanadiv Nature Park, Zichron Yakov, Israel; Faculty of Agriculture/Landscape Management, University of Applied Sciences HTW-Dresden, Pillnitzer Platz 2, Dresden, Germany; DIBAF (Department for Innovation in Biological, Agro-Food and Forest Systems), University of Tuscia, Via San Camillo de Lellis, Viterbo, Italy; Desert Research Institute, 2215 Raggio Pkwy, Reno, NV, United States

Recommended Citation:
Gliksman D.,Rey A.,Seligmann R.,et al. Biotic degradation at night, abiotic degradation at day: positive feedbacks on litter decomposition in drylands[J]. Global Change Biology,2017-01-01,23(4)
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