气候变化领域集成服务门户(CCPortal): Effects of elevated temperature on microbial breakdown of seagrass leaf and tea litter biomass

CCPortal

DOI	10.1007/s10533-020-00715-1
	Effects of elevated temperature on microbial breakdown of seagrass leaf and tea litter biomass
	Trevathan-Tackett S.M.; Brodersen K.E.; Macreadie P.I.
发表日期	2020
ISSN	0168-2563
起始页码	171
结束页码	185
卷号	151 期号:2020-02-03
英文摘要	Seagrass ecosystems are globally-significant ‘blue carbon’ sinks; however, there is concern that this capacity will decline if rising ocean temperatures accelerate microbial decomposition. Decomposition of plant litter is a key process in the global carbon cycle—it influences how much carbon is available for sequestration. Therefore, understanding the biogeochemistry underlying decomposition is essential to predicting the capacity of seagrass ecosystems to act as carbon sinks in the future. Here, we tracked the breakdown of standardised and natural litter of varying chemical recalcitrance (rooibos tea > seagrass leaves > green tea) combined with highly-sensitive microsensor technology to test (a) how elevated water temperatures affect short-term microbial turnover, and (b) provide novel information on how the decay dynamics of the tea litter compare to those of natural litter. We found that increased temperatures (+ 5–10 °C) boosted microbial activity for all substrates, exhibited as enhanced decay, oxygen consumption and sulphate reduction. Within the 1-month experiment, the green tea litter had a rapid Q10 response to the temperature increase, quickly exhausting the resources for microbes, while the response of the rooibos tea and seagrass litters became more apparent toward the end of the experiment. Our results suggest that the tea litters capture a range of decomposition traits and can be compared with natural litter using traditional exponential decay models. The enhanced temperature-driven organic matter turnover, even under anoxic conditions, highlights the vulnerability of fresh litter to microbial attack during the early stages of decay and the potential weakening of blue carbon accumulation rates under future climatic conditions. © 2020, Springer Nature Switzerland AG.
英文关键词	Detritus; Inundation; Remineralisation; Sulphate reduction; Tea bag index; Warming
语种	英语
scopus关键词	Aspalathus linearis
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153091
作者单位	School of Life and Environmental Sciences, Centre for Integrative Ecology, Deakin University, Geelong, VIC, Australia; Department of Biology, Marine Biological Section, University of Copenhagen, Helsingør, Denmark
推荐引用方式 GB/T 7714	Trevathan-Tackett S.M.,Brodersen K.E.,Macreadie P.I.. Effects of elevated temperature on microbial breakdown of seagrass leaf and tea litter biomass[J],2020,151(2020-02-03).
APA	Trevathan-Tackett S.M.,Brodersen K.E.,&Macreadie P.I..(2020).Effects of elevated temperature on microbial breakdown of seagrass leaf and tea litter biomass.Biogeochemistry,151(2020-02-03).
MLA	Trevathan-Tackett S.M.,et al."Effects of elevated temperature on microbial breakdown of seagrass leaf and tea litter biomass".Biogeochemistry 151.2020-02-03(2020).