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Elevating water table reduces net ecosystem carbon losses from global drained wetlands

湿地 环境科学 生态系统 地下水位 水文学(农业) 固碳 生物量(生态学) 水平衡 气候变化 生态学 农林复合经营 二氧化碳 地下水 地质学 生物 岩土工程
作者
Ning Liu,Quancheng Wang,Ronglei Zhou,Ruiyang Zhang,Dashuan Tian,Paul P.J. Gaffney,Weinan Chen,Dezhao Gan,Zelong Zhang,Shuli Niu,Lei Ma,Jinsong Wang
出处
期刊:Global Change Biology [Wiley]
卷期号:30 (9) 被引量:2
标识
DOI:10.1111/gcb.17495
摘要

Abstract Drained wetlands are thought to be carbon (C) source hotspots, and rewetting is advocated to restore C storage in drained wetlands for climate change mitigation. However, current assessments of wetland C balance mainly focus on vertical fluxes between the land and atmosphere, frequently neglecting lateral carbon fluxes and land‐use effects. Here, we conduct a global synthesis of 893 annual net ecosystem C balance (NECB) measures that include net ecosystem exchange of CO 2 , along with C input via manure fertilization, and C removal through biomass harvest or hydrological exports of dissolved organic and inorganic carbon, across wetlands of different status and land uses. We find that elevating water table substantially reduces net ecosystem C losses, with the annual NECB decreasing from 2579 (95% interval: 1976 to 3214) kg C ha −1 year −1 in drained wetlands to −422 (−658 to −176) kg C ha −1 year −1 in natural wetlands, and to −934 (−1532 to −399) kg C ha −1 year −1 in rewetted wetlands globally. Climate, land‐use history, and time since water table changes introduce variabilities, with drainage for (sub)tropical agriculture or forestry uses showing high annual C losses, while the net C losses from drained wetlands can continue to affect soil C pools for several decades. Rewetting all types of drained wetlands is needed, particularly for those formerly agriculture‐used (sub)tropical wetlands where net ecosystem C losses can be largely reduced. Our findings suggest that elevating water table is an important initiative to reduce C losses in degraded wetlands, which could contribute to policy decisions for managing wetlands to enhance their C sequestration.
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