干旱区生态环境知识资源中心(Arid): Priming effect in semi-arid soils of northern Ethiopia under different land use types

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DOI	10.1007/s10533-022-00905-z
	Priming effect in semi-arid soils of northern Ethiopia under different land use types
	Okolo, Chukwuebuka C.; Bore, Ezekiel; Gebresamuel, Girmay; Zenebe, Amanuel; Haile, Mitiku; Nwite, James N.; Dippold, Michaela A.
通讯作者	Okolo, CC (corresponding author)，Mekelle Univ, Dept Land Resources Management & Environm Protect, POB 231, Mekelle, Ethiopia.
来源期刊	BIOGEOCHEMISTRY
ISSN	0168-2563
EISSN	1573-515X
出版年	2022-02
英文摘要	Input of organic carbon (C) to the soil stimulates soil microbial activity leading to changes in turnover of soil organic matter, a phenomenon referred to as priming effect (PE). However, contribution of various management forms in tropical drylands, the role of land use conversion and the soil depth at which such management induces altered PEs remain largely unclear. In this study, we quantified respiration and PE in semi-arid soils of northern Ethiopia. Soils from three depths (0-30, 30-60 and 60-90 cm) in forest, croplands, exclosure and grazing land use types were sampled. The soil samples were incubated for 23 days and PE and respiration quantified after addition of C-14 labeled glucose corresponding to 50% of initial microbial biomass carbon (MBC). Generally, CO2 respired was 30-63% lower in sub than in topsoil with most expressed depth gradients in croplands. The weak negative PEs in subsoil is an indication of highly stabilized C. Contrary, glucose addition induced stronger positive PEs in topsoils collected from forest, exclosure and grazing land. The temporal dynamics of PEs involved a strong positive peak for the first five days after glucose addition and a second smaller peak 10 days after glucose addition in natural ecosystem, corresponding to apparent and real PE, respectively. Lack of positive correlation between PEs and C/N ratio ruled out the N-mining hypothesis, but a positive correlation between PE and MBC suggests co-metabolism as possible mechanism behind the real PE. Higher priming in natural ecosystem compared to cropland is an indication that conversion of natural ecosystem to continuous cropping system leads to depletion of the primable C pool in dryland soils. Additionally, this land use conversion negatively affects biogeochemical C cycling by an altered response of soil microbes to C input.
英文关键词	Ethiopian drylands Glucose Land use Mineralization Priming effect Soil organic matter
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000761854100002
WOS关键词	MICROBIAL BIOMASS CALIBRATION ; FUMIGATION-EXTRACTION METHOD ; ORGANIC-MATTER ; PLANT RESIDUES ; CARBON STOCKS ; VERTICAL-DISTRIBUTION ; MINERALIZATION ; MECHANISMS ; GLUCOSE ; DECOMPOSITION
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377228
作者单位	[Okolo, Chukwuebuka C.; Gebresamuel, Girmay; Zenebe, Amanuel; Haile, Mitiku] Mekelle Univ, Dept Land Resources Management & Environm Protect, POB 231, Mekelle, Ethiopia; [Okolo, Chukwuebuka C.; Zenebe, Amanuel] Mekelle Univ, Inst Climate & Soc, POB 231, Mekelle, Ethiopia; [Okolo, Chukwuebuka C.; Bore, Ezekiel; Dippold, Michaela A.] Georg August Univ Goettingen, Dept Crop Sci, Biogeochem Agroecosyst, Gottingen, Germany; [Okolo, Chukwuebuka C.] Enugu State Univ Sci & Technol, Dept Agron & Ecol Management, PMB 01660, Enugu, Nigeria; [Okolo, Chukwuebuka C.] Univ Vienna, Dept Microbiol & Ecosyst Sci, Ctr Microbiol & Environm Syst Sci, Djerassipl 1, A-1030 Vienna, Austria; [Bore, Ezekiel] Univ Helsinki, Dept Agr Sci, Environm Soil Sci, POB 56, FI-00014 Helsinki, Finland; [Nwite, James N.] Ebonyi State Univ, Dept Soil Sci & Environm Management, PMB 053, Abakaliki, Finland; [Dippold, Michaela A.] Univ Tubingen, Biogeosphere Interact, Tubingen, Germany
推荐引用方式 GB/T 7714	Okolo, Chukwuebuka C.,Bore, Ezekiel,Gebresamuel, Girmay,et al. Priming effect in semi-arid soils of northern Ethiopia under different land use types[J],2022.
APA	Okolo, Chukwuebuka C..,Bore, Ezekiel.,Gebresamuel, Girmay.,Zenebe, Amanuel.,Haile, Mitiku.,...&Dippold, Michaela A..(2022).Priming effect in semi-arid soils of northern Ethiopia under different land use types.BIOGEOCHEMISTRY.
MLA	Okolo, Chukwuebuka C.,et al."Priming effect in semi-arid soils of northern Ethiopia under different land use types".BIOGEOCHEMISTRY (2022).