Ditch emissions partially offset global reductions in methane emissions from peatland drainage

IF 8.1 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Dezhao Gan, Zelong Zhang, Huinan Li, Dongsheng Yu, Zheng Li, Ruijun Long, Shuli Niu, Hongchao Zuo, Xianhong Meng, Jinsong Wang, Lei Ma
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Abstract

Peatlands are globally important carbon sinks but are frequently drained. Drainage activities reduce overall methane emissions; however they are often accompanied by the construction of ditches, which are potential methane emission hotspots. Yet, the offsets of methane emissions from creating ditches in peatlands under different climate zones and land-use types remain unclear. Here we conducted a global meta-analysis by compiling annual methane emissions from paired near-pristine peatlands and terrestrial portion of drained peatlands and ditches to address this issue. Results showed that ditches occupy approximately 3.8 (95% confidence interval: 3.1~4.4)% of all drained peatlands. Ditches emit 695 (511~898) kg ha−1 yr−1 methane overall, with the highest emissions observed in (sub)tropics. Globally, ditch emissions offset approximately 12 (10~14)% for reductions in methane emissions from peatland drainage. Our findings demonstrate the importance of including ditch methane emissions to quantify emission factors for regional to global peatlands affected by drainage. Peatland ditches are methane emissions hotspots that offset around 12% of the emissions reductions that result from drainage, according to a global meta-analysis of peatland studies.

Abstract Image

沟渠排放部分抵消了全球因泥炭地排水而减少的甲烷排放量
泥炭地是全球重要的碳汇,但经常被排水。排水活动可减少甲烷的总体排放量;但排水活动往往伴随着沟渠的修建,而沟渠是潜在的甲烷排放热点。然而,在不同气候带和土地利用类型下,在泥炭地修建沟渠对甲烷排放的抵消作用仍不明确。为了解决这个问题,我们在这里进行了一项全球荟萃分析,汇编了成对的近原始泥炭地以及排水泥炭地和沟渠的陆地部分的甲烷年排放量。结果显示,沟渠约占所有排水泥炭地的 3.8%(95% 置信区间:3.1~4.4)。沟渠的甲烷总排放量为 695 (511~898) kg ha-1 yr-1,(亚)热带地区的排放量最高。在全球范围内,沟渠排放抵消了泥炭地排水甲烷排放减少量的约 12 (10~14)%。我们的研究结果表明,将沟渠甲烷排放纳入量化受排水影响的区域乃至全球泥炭地排放因子非常重要。根据对泥炭地研究的全球荟萃分析,泥炭地沟渠是甲烷排放热点,可抵消因排水而减少的约 12% 的甲烷排放量。
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来源期刊
Communications Earth & Environment
Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
8.60
自引率
2.50%
发文量
269
审稿时长
26 weeks
期刊介绍: Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.
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