气候变化领域集成服务门户(CCPortal): Post-fire effects of soil heating intensity and pyrogenic organic matter on microbial anabolism

CCPortal

DOI	10.1007/s10533-021-00807-6
	Post-fire effects of soil heating intensity and pyrogenic organic matter on microbial anabolism
	Adkins J.; Miesel J.R.
发表日期	2021
ISSN	1682563
起始页码	555
结束页码	571
卷号	154 期号:3
英文摘要	Wildfires cause direct and indirect CO2 emissions due to combustion and post-fire decomposition. Approximately half of temperate forest carbon (C) is stored in soil, so post-fire soil C cycling likely impacts forest C sink strength. Soil C sink strength is partly determined by soil microbial anabolism versus catabolism, which dictates the amount of C respired versus stored in microbial biomass. Fires affect soil C availability and composition, changes that could alter carbon use efficiency (CUE) and microbial biomass production, potentially influencing C sink recovery. Wildfire intensity is forecast to increase in forests of the western United States, and understanding the impacts of fire intensity on microbial anabolism is necessary for predicting fire-climate feedbacks. Our objective was to determine the influence of soil heating intensity and pyrogenic organic matter (PyOM) on microbial anabolism. We simulated the effects of fire intensity by heating soils to 100 or 200 °C for 30 min in a muffle furnace, and we amended the soils with charred or uncharred organic matter. Higher intensity soil heating (200 °C) led to lower microbial biomass carbon (MBC) accumulation, greater C respiration, and lower CUE proxies compared to unheated soils. Conversely, lower intensity heating (100 °C) yielded MBC accumulation and estimated CUE that was similar to unheated soils. Soils amended with PyOM exhibited similar MBC accumulation compared to uncharred organic matter, but lower CO2 emissions. These results indicate that high intensity soil heating decreases soil C-sink strength over the short-term by decreasing the amount of microbial anabolism relative to catabolism. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
英文关键词	Carbon use efficiency; Dissolved organic carbon; Microbial biomass; Pyrogenic organic matter; Soil heating intensity
语种	英语
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/184578
作者单位	Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, United States; Ecology, Evolution, and Behavior Program, Michigan State University, East Lansing, MI, United States; Department of Watershed Sciences, Utah State University, 5210 Old Main Hill, NR 210, Logan, UT 84322, United States
推荐引用方式 GB/T 7714	Adkins J.,Miesel J.R.. Post-fire effects of soil heating intensity and pyrogenic organic matter on microbial anabolism[J],2021,154(3).
APA	Adkins J.,&Miesel J.R..(2021).Post-fire effects of soil heating intensity and pyrogenic organic matter on microbial anabolism.Biogeochemistry,154(3).
MLA	Adkins J.,et al."Post-fire effects of soil heating intensity and pyrogenic organic matter on microbial anabolism".Biogeochemistry 154.3(2021).