Greenhouse gas production and consumption in High Arctic deserts

被引:30
作者
Brummell, Martin E. [1 ]
Farrell, Richard E. [1 ]
Hardy, Sarah P. [1 ]
Siciliano, Steven D. [1 ]
机构
[1] Univ Saskatchewan, Dept Soil Sci, Saskatoon, SK S7N 5A8, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Greenhouse gas; Polar desert; Arctic; Ellesmere Island; Active layer; Diffusion; NITROUS-OXIDE; MICROBIAL PROCESSES; SOIL; CLIMATE; CYCLE; MICROORGANISMS; ECOSYSTEM; PATHWAYS; DYNAMICS; BIOLOGY;
D O I
10.1016/j.soilbio.2013.09.034
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Polar deserts dominate the High Arctic covering over 1 358 000 km(2) but little is known about greenhouse gas (GHG) production or flux in polar desert soils. We measured soil-atmosphere GHG exchange for CO2, CH4, and N2O, and net production of these gases in the active layer at 30 sites across three polar deserts in the High Arctic on Ellesmere Island, Canada for a total of 180 production/consumption estimates. There was inter-annual consistency in patterns of GHG net production and a consistent, significant, positive relationship (r(2) = 0.91-0.93; p < 0.05) between CO2 production and N2O production in Arctic desert sites. This differs from the negative correlations found in wet or moist tundra ecosystems and may arise from the large N2O emissions in dolomitic desert ecosystems. Global change processes that increase microbial activity in deserts will likely increase N2O emissions but increases in activity in wetter tundra will decrease N2O emissions. However, given the unusual co-consumption of CH4 and N2O in the deserts, it is not clear if models of GHG production developed for other ecosystems will apply to these unique Arctic environments. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:158 / 165
页数:8
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