气候变化领域集成服务门户(CCPortal): Soil Moisture but Not Warming Dominates Nitrous Oxide Emissions During Freeze-Thaw Cycles in a Qinghai-Tibetan Plateau Alpine Meadow With Discontinuous Permafrost

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DOI	10.3389/fevo.2021.676027
	Soil Moisture but Not Warming Dominates Nitrous Oxide Emissions During Freeze-Thaw Cycles in a Qinghai-Tibetan Plateau Alpine Meadow With Discontinuous Permafrost
	Chen, Zhe; Ge, Shidong; Zhang, Zhenhua; Du, Yangong; Yao, Buqing; Xie, Huichun; Liu, Pan; Zhang, Yufang; Wang, Wenying; Zhou, Huakun
通讯作者	Wang, WY (通讯作者)，Qinghai Normal Univ, Coll Life Sci, Xining, Peoples R China. ; Wang, WY (通讯作者)，Acad Plateau Sci & Sustainabil, Xining, Peoples R China. ; Wang, WY ; Zhou, HK (通讯作者)，Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Xining, Peoples R China. ; Wang, WY (通讯作者)，Qinghai Normal Univ, Qinghai Prov Key Lab Med Anim & Plants Resources, Xining, Peoples R China.
发表日期	2021
ISSN	2296-701X
卷号	9
英文摘要	Large quantities of organic matter are stored in frozen soils (permafrost) within the Qinghai-Tibetan Plateau (QTP). The most of QTP regions in particular have experienced significant warming and wetting over the past 50 years, and this warming trend is projected to intensify in the future. Such climate change will likely alter the soil freeze-thaw pattern in permafrost active layer and toward significant greenhouse gas nitrous oxide (N2O) release. However, the interaction effect of warming and altered soil moisture on N2O emission during freezing and thawing is unclear. Here, we used simulation experiments to test how changes in N2O flux relate to different thawing temperatures (T-5-5 degrees C, T-10-10 degrees C, and T-20-20 degrees C) and soil volumetric water contents (VWCs, W-15-15%, W-30-30%, and W-45-45%) under 165 F-T cycles in topsoil (0-20 cm) of an alpine meadow with discontinuous permafrost in the QTP. First, in contrast to the prevailing view, soil moisture but not thawing temperature dominated the large N2O pulses during F-T events. The maximum emissions, 1,123.16-5,849.54 mu g m(-2) h(-1), appeared in the range of soil VWC from 17% to 38%. However, the mean N2O fluxes had no significant difference between different thawing temperatures when soil was dry or waterlogged. Second, in medium soil moisture, low thawing temperature is more able to promote soil N2O emission than high temperature. For example, the peak value (5,849.54 mu g m(-2) h(-1)) and cumulative emissions (366.6 mg m(-2)) of (WT5)-T-30 treatment were five times and two to four times higher than (WT10)-T-30 and (WT20)-T-30, respectively. Third, during long-term freeze-thaw cycles, the patterns of cumulative N2O emissions were related to soil moisture. treatments; on the contrary, the cumulative emissions of W-45 treatments slowly increased until more than 80 cycles. Finally, long-term freeze-thaw cycles could improve nitrogen availability, prolong N2O release time, and increase N2O cumulative emission in permafrost active layer. Particularly, the high emission was concentrated in the first 27 and 48 cycles in W-15 and W-30, respectively. Overall, our study highlighted that large emissions of N2O in F-T events tend to occur in medium moisture soil at lower thawing temperature; the increased number of F-T cycles may enhance N2O emission and nitrogen mineralization in permafrost active layer.
关键词	CLIMATE-CHANGE DYNAMICS CARBON WATER N2O DENITRIFICATION NITRIFICATION COMMUNITIES RESPONSES SEASON
英文关键词	global climate change; nitrous oxide; permafrost active layer; freeze-thaw; nitrogen transformation
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000668731600001
来源期刊	FRONTIERS IN ECOLOGY AND EVOLUTION
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254515
作者单位	[Chen, Zhe; Xie, Huichun; Liu, Pan; Zhang, Yufang; Wang, Wenying] Qinghai Normal Univ, Coll Life Sci, Xining, Peoples R China; [Chen, Zhe; Xie, Huichun; Wang, Wenying] Acad Plateau Sci & Sustainabil, Xining, Peoples R China; [Chen, Zhe; Zhang, Zhenhua; Du, Yangong; Yao, Buqing; Xie, Huichun; Wang, Wenying; Zhou, Huakun] Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Xining, Peoples R China; [Chen, Zhe; Xie, Huichun; Wang, Wenying] Qinghai Normal Univ, Qinghai Prov Key Lab Med Anim & Plants Resources, Xining, Peoples R China; [Ge, Shidong] Henan Agr Univ, Coll Landscape Architecture & Art, Zhengzhou, Peoples R China
推荐引用方式 GB/T 7714	Chen, Zhe,Ge, Shidong,Zhang, Zhenhua,et al. Soil Moisture but Not Warming Dominates Nitrous Oxide Emissions During Freeze-Thaw Cycles in a Qinghai-Tibetan Plateau Alpine Meadow With Discontinuous Permafrost[J]. 中国科学院西北生态环境资源研究院,2021,9.
APA	Chen, Zhe.,Ge, Shidong.,Zhang, Zhenhua.,Du, Yangong.,Yao, Buqing.,...&Zhou, Huakun.(2021).Soil Moisture but Not Warming Dominates Nitrous Oxide Emissions During Freeze-Thaw Cycles in a Qinghai-Tibetan Plateau Alpine Meadow With Discontinuous Permafrost.FRONTIERS IN ECOLOGY AND EVOLUTION,9.
MLA	Chen, Zhe,et al."Soil Moisture but Not Warming Dominates Nitrous Oxide Emissions During Freeze-Thaw Cycles in a Qinghai-Tibetan Plateau Alpine Meadow With Discontinuous Permafrost".FRONTIERS IN ECOLOGY AND EVOLUTION 9(2021).