气候变化领域集成服务门户(CCPortal): Trade-off between ‘new’ SOC stabilisation from above-ground inputs and priming of native C as determined by soil type and residue placement

CCPortal

DOI	10.1007/s10533-020-00675-6
	Trade-off between ‘new’ SOC stabilisation from above-ground inputs and priming of native C as determined by soil type and residue placement
	Mitchell E.; Scheer C.; Rowlings D.; Cotrufo M.F.; Conant R.T.; Friedl J.; Grace P.
发表日期	2020
ISSN	0168-2563
起始页码	221
结束页码	236
卷号	149 期号:2
英文摘要	Due to the geographical expanse of grasslands with depleted organic matter stocks, there has been growing interest in the management of these ecosystems for C sequestration to help mitigate climate change. It is generally accepted that management practices intending to increase forage production (e.g. decreasing grazing density) result in increased soil C stocks by increasing the return of biomass inputs to the soil organic carbon (SOC) pool. However, the contribution of C inputs to stable SOC versus GHG losses, and how this is affected by soil properties, remains largely unknown, particularly within subtropical biomes. To investigate the role of soil texture and mineralogy on SOC stabilisation, we identified three different soil types with varying physical properties in close proximity (< 2 km2) to each other. We used isotopically labelled plant material (13C), placed on the soil surface versus incorporated within the mineral soil, to trace the fate of fresh residue inputs into SOM fractions that differed in their degree of protection and mechanistic interactions with the soil matrix. Weekly GHG measurements (CO2, N2O and CH4) were taken to understand the overall GHG balance resulting from C inputs (i.e. SOC accrual versus GHG losses in CO2 equivalents). In finer textured soils with a greater smectite content, SOC accrual was greater but was significantly outweighed by GHG losses, primarily from native SOC priming. The incorporation of residue within the soil increased residue-derived SOC accrual by 4- to 5-fold, whilst also suppressing the priming of native SOC. This improved understanding of how soil texture and residue placement affect the global warming mitigation potential of subtropical grassland soils will be important in determining identifiable regions that should be targeted for SOC restoration efforts by increasing C inputs. © 2020, Springer Nature Switzerland AG.
英文关键词	C priming effect; C sequestration; Climate change mitigation; Decomposition; GHG fluxes; SOC stabilisation; Soil texture; Stable isotopes
语种	英语
scopus关键词	biomass; carbon sequestration; climate change; global warming; grassland soil; grazing; mineralogy; organic carbon; smectite; soil organic matter; soil surface; soil texture; soil type; trade-off
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/153134
作者单位	Institute for Future Environments, Queensland University of Technology, Brisbane, QLD, Australia; Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO, United States; Institute for Future Environments, Queensland University of Technology, Level 7, P Block, Gardens Point Campus, 2 George Street, Brisbane, QLD 4000, Australia
推荐引用方式 GB/T 7714	Mitchell E.,Scheer C.,Rowlings D.,等. Trade-off between ‘new’ SOC stabilisation from above-ground inputs and priming of native C as determined by soil type and residue placement[J],2020,149(2).
APA	Mitchell E..,Scheer C..,Rowlings D..,Cotrufo M.F..,Conant R.T..,...&Grace P..(2020).Trade-off between ‘new’ SOC stabilisation from above-ground inputs and priming of native C as determined by soil type and residue placement.Biogeochemistry,149(2).
MLA	Mitchell E.,et al."Trade-off between ‘new’ SOC stabilisation from above-ground inputs and priming of native C as determined by soil type and residue placement".Biogeochemistry 149.2(2020).