DOI: 10.1111/gcb.12063
论文题名: Warming and drought reduce temperature sensitivity of nitrogen transformations
作者: Auyeung D.S.N. ; Suseela V. ; Dukes J.S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 2 起始页码: 662
结束页码: 676
语种: 英语
英文关键词: Apparent Q10
; Boston-Area Climate Experiment
; Climate change
; Multifactor experiment
; Nitrogen cycling
; Old-field community
Scopus关键词: nitrogen
; climate change
; drought
; ecosystem modeling
; environmental change
; freeze-thaw cycle
; mineralization
; nitrification
; nitrogen cycle
; nutrient availability
; temperature effect
; warming
; article
; chemistry
; drought
; greenhouse effect
; temperature
; Droughts
; Global Warming
; Nitrogen
; Temperature
; Massachusetts
; United States
英文摘要: Shifts in nitrogen (N) mineralization and nitrification rates due to global changes can influence nutrient availability, which can affect terrestrial productivity and climate change feedbacks. While many single-factor studies have examined the effects of environmental changes on N mineralization and nitrification, few have examined these effects in a multifactor context or recorded how these effects vary seasonally. In an old-field ecosystem in Massachusetts, USA, we investigated the combined effects of four levels of warming (up to 4 °C) and three levels of precipitation (drought, ambient, and wet) on net N mineralization, net nitrification, and potential nitrification. We also examined the treatment effects on the temperature sensitivity of net N mineralization and net nitrification and on the ratio of C mineralization to net N mineralization. During winter, freeze-thaw events, snow depth, and soil freezing depth explained little of the variation in net nitrification and N mineralization rates among treatments. During two years of treatments, warming and altered precipitation rarely influenced the rates of N cycling, and there was no evidence of a seasonal pattern in the responses. In contrast, warming and drought dramatically decreased the apparent Q10 of net N mineralization and net nitrification, and the warming-induced decrease in apparent Q10 was more pronounced in ambient and wet treatments than the drought treatment. The ratio of C mineralization to net N mineralization varied over time and was sensitive to the interactive effects of warming and altered precipitation. Although many studies have found that warming tends to accelerate N cycling, our results suggest that warming can have little to no effect on N cycling in some ecosystems. Thus, ecosystem models that assume that warming will consistently increase N mineralization rates and inputs of plant-available N may overestimate the increase in terrestrial productivity and the magnitude of an important negative feedback to climate change. © 2012 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62549
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, United States; School of Agricultural, Forest and Environmental Sciences, Clemson University, Clemson, SC, 29634, United States; Department of Biological Sciences, Purdue University, West Lafayette, IN, 47907, United States; Department of Biology, University of Massachusetts, Boston, MA, 02125, United States
Recommended Citation:
Auyeung D.S.N.,Suseela V.,Dukes J.S.. Warming and drought reduce temperature sensitivity of nitrogen transformations[J]. Global Change Biology,2013-01-01,19(2)