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过去几十年的火灾救援对稀树草原的碳储量增加有限
2022-03-20 16:28
来源：小柯机器人

美国耶鲁大学A. Carla Staver、Yong Zhou等研究人员合作发现，过去几十年的火灾救援对稀树草原的碳储量增加有限。这一研究成果发表在2022年3月16日出版的国际学术期刊《自然》上。

研究人员提供了一个关于整个生态系统对非洲中度热带草原60多年防火反应的首次直接估计。研究人员发现，尽管树木覆盖率增加了78.9±29.3%，但火灾救援仅使整个生态系统的碳储存增加了35.4±12%（平均值±标准误差），对应的总收益为23.0±6.1百万克/公顷，平均约为0.35±0.09百万克/公顷每年，比以前假设的要低一个数量级以上。经常燃烧的热带草原有大量的地下碳，特别是在生物质和深层土壤中。这些地下碳库在造林或灭火计划中没有得到充分考虑，但可能意味着热带稀树草原十年的固碳潜力可以忽略不计，特别是与随之而来的生物多样性和功能的损失相权衡。
 
据介绍，稀树草原占陆地表面的五分之一，贡献了陆地净初级生产的三分之一，占全球燃烧面积的四分之三，占全球火灾引起碳排放的一半以上。火灾救援和植树造林已被提议作为增加这些生态系统的碳封存的工具。然而，目前还缺乏对热带草原整个生态系统碳储存的有力量化，特别是在改变的火灾制度下。
 
附：英文原文
 
Title: Limited increases in savanna carbon stocks over decades of fire suppression

Author: Zhou, Yong, Singh, Jenia, Butnor, John R., Coetsee, Corli, Boucher, Peter B., Case, Madelon F., Hockridge, Evan G., Davies, Andrew B., Staver, A. Carla

Issue&Volume: 2022-03-16

Abstract: Savannas cover a fifth of the land surface and contribute a third of terrestrial net primary production, accounting for three-quarters of global area burned and more than half of global fire-driven carbon emissions1,2,3. Fire suppression and afforestation have been proposed as tools to increase carbon sequestration in these ecosystems2,4. A robust quantification of whole-ecosystem carbon storage in savannas is lacking however, especially under altered fire regimes. Here we provide one of the first direct estimates of whole-ecosystem carbon response to more than 60years of fire exclusion in a mesic African savanna. We found that fire suppression increased whole-ecosystem carbon storage by only 35.4±12% (mean±standard error), even though tree cover increased by 78.9±29.3%, corresponding to total gains of 23.0±6.1MgCha1 at an average of about 0.35±0.09MgCha1year1, more than an order of magnitude lower than previously assumed4. Frequently burned savannas had substantial belowground carbon, especially in biomass and deep soils. These belowground reservoirs are not fully considered in afforestation or fire-suppression schemes but may mean that the decadal sequestration potential of savannas is negligible, especially weighed against concomitant losses of biodiversity and function.

DOI: 10.1038/s41586-022-04438-1

Source: https://www.nature.com/articles/s41586-022-04438-1

Nature：《自然》，创刊于1869年。隶属于施普林格·自然出版集团，最新IF：69.504
官方网址：http://www.nature.com/
投稿链接：http://www.nature.com/authors/submit_manuscript.html


本期文章：《自然》：Online/在线发表

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