期刊
GLOBAL BIOGEOCHEMICAL CYCLES
卷 33, 期 10, 页码 1251-1263出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GB006276
关键词
river; stream; intermittent; temporary; respiration; CO2
资金
- Short-Term Scientific Mission of the COST Action [CA15113]
- COST (European Cooperation in Science and Technology)
- EU [603629, 748625]
- Grant for Research Groups of the Basque University System - Basque Government [IT-951-16]
- Spanish Ministry of Science, Innovation and Universities through project CHYDROCHANGE [CGL2017-86788C3-2-P, CGL2017-86788-C3-3-P]
- Swiss National Science Foundation [PP00P3_150698, PP00P3_179089]
- EU project LIFE+ TRivers [LIFE13 ENV/ES/000341]
- INTER-COST project [LTC17017]
- [CONICYT/FONDAT/15130015]
- Marie Curie Actions (MSCA) [748625] Funding Source: Marie Curie Actions (MSCA)
Intermittent rivers and ephemeral streams (IRES) may represent over half the global stream network, but their contribution to respiration and carbon dioxide (CO2) emissions is largely undetermined. In particular, little is known about the variability and drivers of respiration in IRES sediments upon rewetting, which could result in large pulses of CO2. We present a global study examining sediments from 200 dry IRES reaches spanning multiple biomes. Results from standardized assays show that mean respiration increased 32-fold to 66-fold upon sediment rewetting. Structural equation modeling indicates that this response was driven by sediment texture and organic matter quantity and quality, which, in turn, were influenced by climate, land use, and riparian plant cover. Our estimates suggest that respiration pulses resulting from rewetting of IRES sediments could contribute significantly to annual CO2 emissions from the global stream network, with a single respiration pulse potentially increasing emission by 0.2-0.7%. As the spatial and temporal extent of IRES increases globally, our results highlight the importance of recognizing the influence of wetting-drying cycles on respiration and CO2 emissions in stream networks.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据