干旱区生态环境知识资源中心(Arid): Could Cryoturbic Diapirs Be Key for Understanding Ecological Feedbacks to Climate Change in High Arctic Polar Deserts?

Arid

DOI	10.1029/2019JG005263
	Could Cryoturbic Diapirs Be Key for Understanding Ecological Feedbacks to Climate Change in High Arctic Polar Deserts?
	Ota, Mitsuaki 1; Mamet, Steven D.1; Muller, Amanda L.1; Lamb, Eric G.2; Dhillon, Gurbir 1; Peak, Derek 1; Siciliano, Steven D.1
通讯作者	Siciliano, Steven D.
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
EISSN	2169-8961
出版年	2020
卷号	125 期号:3
英文摘要	High Arctic polar deserts cover 26% of the Arctic. Increasing temperatures are predicted to significantly alter polar desert freeze-thaw and biogeochemical cycles, with important implications for greenhouse gas emissions. However, the mechanisms underlying these changing cycles are still highly uncertain. Cryoturbic, carbon-rich Bhy horizons (diapirs) in frost boils are key nutrient sources for Salix arctica. We hypothesized that diapirism leads to organic carbon characteristics that alter microbial pathways, which then control root foraging and greenhouse gas production. During July and August 2013, we characterized soil properties and examined gross nitrogen transformation rates in frost boils both with and without diapirs in two High Arctic polar deserts (dolomite and granite) near Alexandra Fjord (78 degrees 51 ' N 75 degrees 54 ' W), Ellesmere Island, Nunavut, Canada. Diapiric frost boils had 18% higher soil organic carbon in the dolomitic and 9% higher in the granitic deserts, and 29% higher total dissolved nitrogen in the dolomitic desert. However, diapirs decreased gross nitrogen mineralization rates by 30% in the dolomitic and by 48% in the granitic deserts. Attenuated total reflectance Fourier transformed mid-infrared spectroscopy revealed greater concentrations of polysaccharides and recalcitrant carbon in diapiric versus nondiapiric frost boils. These increased polysaccharide concentrations likely facilitate diapirism as soil viscosity increases with polysaccharides. Lower microbial activity or ectomycorrhizae that are known to colonize S. arctica may accumulate total dissolved nitrogen in diapirs. Our results suggest geomorphologic-plant-microbe interactions may underlie important patterns of geochemical cycling in arctic systems. Thus, polar desert frost boils should represent a key focus of future investigations of climate change in arctic systems.
英文关键词	permafrost patterned ground soil viscosity frost boils soil organic carbon polysaccharides
类型	Article
语种	英语
国家	Canada
收录类别	SCI-E
WOS记录号	WOS:000522353000020
WOS关键词	GREENHOUSE-GAS PRODUCTION ; SOIL ORGANIC-MATTER ; NITROUS-OXIDE ; PLANT-COMMUNITIES ; ELLESMERE-ISLAND ; CARBON ; TUNDRA ; VEGETATION ; WATER ; ECOSYSTEM
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314970
作者单位	1.Univ Saskatchewan, Dept Soil Sci, Saskatoon, SK, Canada; 2.Univ Saskatchewan, Dept Plant Sci, Saskatoon, SK, Canada
推荐引用方式 GB/T 7714	Ota, Mitsuaki,Mamet, Steven D.,Muller, Amanda L.,et al. Could Cryoturbic Diapirs Be Key for Understanding Ecological Feedbacks to Climate Change in High Arctic Polar Deserts?[J],2020,125(3).
APA	Ota, Mitsuaki.,Mamet, Steven D..,Muller, Amanda L..,Lamb, Eric G..,Dhillon, Gurbir.,...&Siciliano, Steven D..(2020).Could Cryoturbic Diapirs Be Key for Understanding Ecological Feedbacks to Climate Change in High Arctic Polar Deserts?.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,125(3).
MLA	Ota, Mitsuaki,et al."Could Cryoturbic Diapirs Be Key for Understanding Ecological Feedbacks to Climate Change in High Arctic Polar Deserts?".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 125.3(2020).