Methane flux measurements along a floodplain soil moisture gradient in the Okavango Delta, Botswana.
Methane flux measurements along a floodplain soil moisture gradient in the Okavango Delta, Botswana.
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DOI：
10.1098/rsta.2020.0448
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发表时间：
2021-11-15
期刊：
影响因子：
--
通讯作者：
Skiba UM
中科院分区：
文献类型：
--
作者：
Gondwe MJ;Helfter C;Murray-Hudson M;Levy PE;Mosimanyana E;Makati A;Mfundisi KB;Skiba UM
数据贫乏的热带湿地是全球大气CH 4的重要来源。我们研究了CH 4通量使用封闭的商会沿着土壤水分梯度在热带季节性沼泽在奥卡万戈三角洲，博茨瓦纳，世界第六大热带湿地。这项研究的目的是评估净甲烷通量和控制环境因素在三角洲的季节性洪泛区。湿地季节性洪泛区的CH 4净排放量估计为0.072 ± 0.016 Tg a−1。在偶尔漫滩的邻近干燥土壤中，微生物CH 4氧化约为2.817 × 10 −3 ± 0.307 × 10−3 Tg a−1，占季节性漫滩土壤CH 4排放总量的4%。因此，在三角洲的干燥土壤中观察到的微生物CH 4汇相当于全球平均汇的4- 6%。土壤含水量（SWC）和土壤有机质的主要环境因子控制CH 4通量的季节性和偶尔的洪泛区。土壤CH 4排放和氧化在三角洲的最佳SWC估计分别为50%和15%。电导率和pH值与Nxaraga季节性洪泛区CH 4通量相关性较差（r2 ≤ 0.11，p < 0.05）。这篇文章是讨论会议议题“甲烷上升：变暖是变暖的饲料吗？”（第一部分）
Data-poor tropical wetlands constitute an important source of atmospheric CH4 in the world. We studied CH4 fluxes using closed chambers along a soil moisture gradient in a tropical seasonal swamp in the Okavango Delta, Botswana, the sixth largest tropical wetland in the world. The objective of the study was to assess net CH4 fluxes and controlling environmental factors in the Delta's seasonal floodplains. Net CH4 emissions from seasonal floodplains in the wetland were estimated at 0.072 ± 0.016 Tg a−1. Microbial CH4 oxidation of approximately 2.817 × 10−3 ± 0.307 × 10−3 Tg a−1 in adjacent dry soils of the occasional floodplains accounted for the sink of 4% of the total soil CH4 emissions from seasonal floodplains. The observed microbial CH4 sink in the Delta's dry soils is, therefore, comparable to the global average sink of 4–6%. Soil water content (SWC) and soil organic matter were the main environmental factors controlling CH4 fluxes in both the seasonal and occasional floodplains. The optimum SWC for soil CH4 emissions and oxidation in the Delta were estimated at 50% and 15%, respectively. Electrical conductivity and pH were poorly correlated (r2 ≤ 0.11, p < 0.05) with CH4 fluxes in the seasonal floodplain at Nxaraga. This article is part of a discussion meeting issue 'Rising methane: is warming feeding warming? (part1)'.
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