Impacts of land management practices on blue carbon stocks and greenhouse gas fluxes in coastal ecosystems-A meta-analysis.,Global Change Biology

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Impacts of land management practices on blue carbon stocks and greenhouse gas fluxes in coastal ecosystems-A meta-analysis.
Global Change Biology ( IF 10.8 ) Pub Date : 2019-12-04 , DOI: 10.1111/gcb.14946
J Jack O'Connor ₁ , Benedikt J Fest ₁ , Michael Sievers ₂ , Stephen E Swearer ₁

Affiliation

Global recognition of climate change and its predicted consequences has created the need for practical management strategies for increasing the ability of natural ecosystems to capture and store atmospheric carbon. Mangrove forests, saltmarshes and seagrass meadows, referred to as blue carbon ecosystems (BCEs), are hotspots of atmospheric CO2 storage due to their capacity to sequester carbon at a far higher rate than terrestrial forests. Despite increased effort to understand the mechanisms underpinning blue carbon fluxes, there has been little synthesis of how management activities influence carbon stocks and greenhouse gas (GHG) fluxes in BCEs. Here, we present a global meta-analysis of 111 studies that measured how carbon stocks and GHG fluxes in BCEs respond to various coastal management strategies. Research effort has focused mainly on restoration approaches, which resulted in significant increases in blue carbon after 4 years compared to degraded sites, and the potential to reach parity with natural sites after 7-17 years. Lesser studied management alternatives, such as sediment manipulation and altered hydrology, showed only increases in biomass and weaker responses for soil carbon stocks and sequestration. The response of GHG emissions to management was complex, with managed sites emitting less than natural reference sites but emitting more compared to degraded sites. Individual GHGs also differed in their responses to management. To date, blue carbon management studies are underrepresented in the southern hemisphere and are usually limited in duration (61% of studies <3 years duration). Our meta-analysis describes the current state of blue carbon management from the available data and highlights recommendations for prioritizing conservation management, extending monitoring time frames of BCE carbon stocks, improving our understanding of GHG fluxes in open coastal systems and redistributing management and research effort into understudied, high-risk areas.

中文翻译：

土地管理措施对沿海生态系统中蓝碳储量和温室气体通量的影响-荟萃分析。

全球对气候变化及其预期后果的认识使人们需要制定切实可行的管理战略，以提高自然生态系统捕获和储存大气碳的能力。红树林，盐沼和海草草甸，被称为蓝碳生态系统（BCE），是大气中二氧化碳储存的热点，因为它们能够以比陆地森林高得多的速度固存碳。尽管人们付出了更多的努力来理解支撑蓝色碳通量的机制，但是关于管理活动如何影响BCE中的碳储量和温室气体（GHG）通量的研究很少。在这里，我们介绍了111项研究的全球荟萃分析，这些研究测量了BCE中的碳储量和GHG通量如何响应各种沿海管理策略。研究工作主要集中在恢复方法上，与退化的地点相比，这导致4年后蓝碳显着增加，并且有可能在7-17年后达到与自然地点同等的水平。较少研究的管理替代方案，例如泥沙处理和水文变化，仅显示出生物量增加，对土壤碳储量和固存的反应较弱。温室气体排放对管理的响应是复杂的，受管理的站点排放量少于自然参考站点，但与退化站点相比，排放量更多。各个温室气体对管理的反应也有所不同。迄今为止，南半球的蓝碳管理研究代表性不足，通常持续时间有限（<3年的研究中有61％）。

更新日期：2020-01-13

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