DOI: 10.5194/bg-17-781-2020
论文题名: Soil carbon release responses to long-term versus short-term climatic warming in an arid ecosystem
作者: Yu H. ; Xu Z. ; Zhou G. ; Shi Y.
刊名: Biogeosciences
ISSN: 17264170
出版年: 2020
卷: 17, 期: 3 语种: 英语
Scopus关键词: arid region
; belowground biomass
; climate effect
; decomposition
; desert
; global warming
; grassland soil
; growing season
; long-term change
; soil carbon
; terrestrial ecosystem
; China
英文摘要: Climate change severely impacts the grassland carbon cycling by altering rates of litter decomposition and soil respiration (Rs), especially in arid areas. However, little is known about the Rs responses to different warming magnitudes and watering pulses in situ in desert steppes. To examine their effects on Rs, we conducted long-term moderate warming (4 years, ~ 3 °C), short-term acute warming (1 year, ~ 4 °C) and watering field experiments in a desert grassland of northern China. While experimental warming significantly reduced average Rs by 32.5% and 40.8% under long-term moderate and short-term acute warming regimes, respectively, watering pulses (fully irrigating the soil to field capacity) stimulated it substantially. This indicates that climatic warming constrains soil carbon release, which is controlled mainly by decreased soil moisture, consequently influencing soil carbon dynamics. Warming did not change the exponential relationship between Rs and soil temperature, whereas the relationship between Rs and soil moisture was better fitted to a sigmoid function. The belowground biomass, soil nutrition, and microbial biomass were not significantly affected by either long-term or short-term warming regimes, respectively. The results of this study highlight the great dependence of soil carbon emission on warming regimes of different durations and the important role of precipitation pulses during the growing season in assessing the terrestrial ecosystem carbon balance and cycle. © 2020 Royal Society of Chemistry. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159252
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, 100081, China
Recommended Citation:
Yu H.,Xu Z.,Zhou G.,et al. Soil carbon release responses to long-term versus short-term climatic warming in an arid ecosystem[J]. Biogeosciences,2020-01-01,17(3)