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	CO2 emission from soil inorganic C in coastal croplands of the Yangtze Delta
通讯作者	Ge, Tida(getida@nbu.edu.cn)
	Cui, Jun1,2; Nie, Ming3; Wang, Shuang2; Zhu, Zhenke2; Shi, Gongle4; Kuzyakov, Yakov5,6; Ge, Tida2
	2025-04-01
发表期刊	AGRICULTURE ECOSYSTEMS & ENVIRONMENT (IF:3.541[JCR-2017],4.354[5-Year])
ISSN	0167-8809
卷号	381页码:13
摘要	Soil inorganic C (SIC) has a huge stock and is supplemented by the bicarbonate-rich groundwater, irrigation water and seawater in the coastal Yangtze Delta area, where soil acidification may induce high CO2 efflux by neutralizing SIC. This study assessed whether and to what extent SIC generally contributed to surface or subsurface (50 cm) CO2 collected in typical croplands (a rice-wheat rotation paddy and an upland field) of this coastal region, and further investigated factors regulating SIC-derived CO2 efflux (E-IC) by soil incubation. The E-IC was separated from CO2 of organic sources (E-OC) based on their distinct C-13 isotopic signatures. Our results indicated that SIC contributed around 16 % to surface CO2 effluxes in the paddy field and 52 % to subsoil CO2 in the upland field. Despite the alkaline soil environments (with pH of 7-9), adding bicarbonate induced high CO2 effluxes comparable to those under glucose amendments, suggesting high reactivity of the dissolved SIC (HCO3) in E-IC generation. Within a month, the C-13-labeled HCO3 (1 mg C g(1) soil) was almost completely converted to CO2 and induced extra E-IC emission (84 % of the HCO3 input) from unlabeled sources. Bicarbonates also contributed > 40 % to total CO2 emission in soils amended with groundwater. However, the HCO3-amended soil did not emit but strongly adsorbed CO2 when soil organic matter and microbial communities were destroyed by heating at 550 degrees C, implying the involvement of these organic components in HCO3CO2 conversion. The E-IC effluxes increased with temperature, N fertilization (due to acidity released in nitrification), microbial respiration (associated with straw addition or reinoculation rate of sterilized soil), and bicarbonate addition rate, but decreased with soil moisture. Multiple regression indicated that bicarbonate addition and N fertilization were most effective in increasing E-IC. In conclusion, the SIC pools, particularly the bicarbonates, were active players in coastal soil C cycling, releasing CO2 fluxes susceptible to environmental, biological, and management influences. With the widespread acidification of calcareous soils under intensive N fertilization, special attention should be paid to not only the accelerated carbonate dissolution and leaching, but possible CO2 emissions resulting from the increased soil bicarbonates, in coastal agroecosystems.
关键词	Soil bicarbonate Neutralization Nitrification Soil acidification Temperature sensitivity
DOI	10.1016/j.agee.2024.109440
收录类别	SCI
语种	英语
关键词[WOS]	CARBON-DIOXIDE ; WATER CONTRIBUTE ; CALCAREOUS SOIL ; MOJAVE-DESERT ; CO2 EFFLUX ; DISSOLUTION ; NITRIFICATION ; FRACTIONATION ; BICARBONATES ; TEMPERATURE
资助项目	National key research and development program[2023YFD1900902] ; The Pioneer and Leading Goose R & D Program of Zhejiang[2023C020168] ; National Natural Science Foundation of China[42141006] ; National Natural Science Foundation of China[31872695] ; Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering at the Institute of Biodiversity Science, Fudan University[2023-FDU-KF-030] ; RUDN University Strategic Academic Leadership Program
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
WOS类目	Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences
WOS记录号	WOS:001390168500001
项目资助者	National key research and development program ; The Pioneer and Leading Goose R & D Program of Zhejiang ; National Natural Science Foundation of China ; Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering at the Institute of Biodiversity Science, Fudan University ; RUDN University Strategic Academic Leadership Program
出版者	ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44767
专题	中国科学院南京地质古生物研究所
通讯作者	Ge, Tida
作者单位	1.Nantong Univ, Sch Life Sci, Nantong 226019, Peoples R China 2.Ningbo Univ, Inst Plant Virol, State Key Lab Managing Biot & Chem Threats Qual &, Ningbo 315211, Peoples R China 3.Fudan Univ, Sch Life Sci, Dept Ecol & Evolutionary Biol, Minist Educ,Key Lab Biodivers Sci & Ecol Engn, Shanghai 200433, Peoples R China 4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 5.Univ Gottingen, Dept Agr Soil Sci, Dept Soil Sci Temperate Ecosyst, D-37077 Gottingen, Germany 6.Peoples Friendship Univ Russia, RUDN Univ, Moscow 117198, Russia
推荐引用方式 GB/T 7714	Cui, Jun,Nie, Ming,Wang, Shuang,et al. CO2 emission from soil inorganic C in coastal croplands of the Yangtze Delta[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2025,381:13.
APA	Cui, Jun.,Nie, Ming.,Wang, Shuang.,Zhu, Zhenke.,Shi, Gongle.,...&Ge, Tida.(2025).CO2 emission from soil inorganic C in coastal croplands of the Yangtze Delta.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,381,13.
MLA	Cui, Jun,et al."CO2 emission from soil inorganic C in coastal croplands of the Yangtze Delta".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 381(2025):13.

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