气候变化领域集成服务门户(CCPortal): Biochar reduced the mineralization of native and added soil organic carbon: evidence of negative priming and enhanced microbial carbon use efficiency

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DOI	10.1007/s42773-023-00294-y
	Biochar reduced the mineralization of native and added soil organic carbon: evidence of negative priming and enhanced microbial carbon use efficiency
	Kalu, Subin; Seppanen, Aino; Mganga, Kevin Z.; Sietio, Outi-Maaria; Glaser, Bruno; Karhu, Kristiina
发表日期	2024
ISSN	2524-7972
EISSN	2524-7867
起始页码	6
结束页码	1
卷号	6 期号:1
英文摘要	Biochar has been widely recognized for its potential to increase carbon (C) sequestration and mitigate climate change. This potential is affected by how biochar interacts with native soil organic carbon (SOC) and fresh organic substrates added to soil. However, only a few studies have been conducted to understand this interaction. To fill this knowledge gap, we conducted a C-13-glucose labelling soil incubation for 6 months using fine-textured agricultural soil (Stagnosol) with two different biochar amounts. Biochar addition reduced the mineralization of SOC and C-13-glucose and increased soil microbial biomass carbon (MBC) and microbial carbon use efficiency (CUE). The effects were found to be additive i.e., higher biochar application rate resulted in lower mineralization of SOC and C-13-glucose. Additionally, soil density fractionation after 6 months revealed that most of the added biochar particles were recovered in free particulate organic matter (POM) fraction. Biochar also increased the retention of C-13 in free POM fraction, indicating that added C-13-glucose was preserved within the biochar particles. The measurement of C-13 from the total amino sugar fraction extracted from the biochar particles suggested that biochar increased the microbial uptake of added C-13-glucose and after they died, the dead microbial residues (necromass) accumulated inside biochar pores. Biochar also increased the proportion of occluded POM, demonstrating that increased soil occlusion following biochar addition reduced SOC mineralization. Overall, the study demonstrates the additional C sequestering potential of biochar by inducing negative priming of native SOC as well as increasing CUE, resulting in the formation and stabilization of microbial necromass.
英文关键词	Biochar; Carbon sequestration; Carbon use efficiency; C-13-labelling; Soil microbial necromass; Priming effect
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
WOS类目	Environmental Sciences ; Soil Science
WOS记录号	WOS:001142467800002
来源期刊	BIOCHAR
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/299519
作者单位	University of Helsinki; North Carolina State University; Utrecht University; Hame University of Applied Sciences; Martin Luther University Halle Wittenberg
推荐引用方式 GB/T 7714	Kalu, Subin,Seppanen, Aino,Mganga, Kevin Z.,et al. Biochar reduced the mineralization of native and added soil organic carbon: evidence of negative priming and enhanced microbial carbon use efficiency[J],2024,6(1).
APA	Kalu, Subin,Seppanen, Aino,Mganga, Kevin Z.,Sietio, Outi-Maaria,Glaser, Bruno,&Karhu, Kristiina.(2024).Biochar reduced the mineralization of native and added soil organic carbon: evidence of negative priming and enhanced microbial carbon use efficiency.BIOCHAR,6(1).
MLA	Kalu, Subin,et al."Biochar reduced the mineralization of native and added soil organic carbon: evidence of negative priming and enhanced microbial carbon use efficiency".BIOCHAR 6.1(2024).