Effects of elevated atmospheric CO2 concentration and warming on stability of soil organic carbon pool accumulation, molecular composition and structure stability

doi:10.17521/cjpe.2024.0376

Abstract

Abstract:

In the context of carbon sequestration, emission reduction, and the “Dual Carbon” goals, the impact of climate change characterized by the combined effects of elevated atmospheric carbon dioxide (CO₂) concentration and global warming on the dynamics of soil organic carbon (SOC) has emerged as a critical research focus. Understanding the mechanisms through of climate change influences SOC pools remains a significant challenge in academic research. Previous studies on the effect of climate change on terrestrial ecosystem carbon cycling have predominantly examined single factors, such as increased CO₂ concentration or warming, with a focus on plant growth, litter substrate quality, soil physicochemical properties, physical/chemical fractions of organic carbon, and microbial community structure. Building on recent advancements in both domestic and international research, this review synthesizes the effects and underlying mechanisms of elevated CO₂ concentration and warming on SOC accumulation. By integrating the coupling effects of SOC fractions, molecular composition, structural characteristics, and the differential responses of topsoil and subsoil, we elucidate the intrinsic mechanism governing SOC carbon accumulation and transformation under these climatic conditions. Furthermore, we highlight key areas for future research, including (1) clarifying the coupling relationships among SOC end-member inputs, molecular composition, and structural characteristics, and (2) uncovering the mechanisms by which long-term climate change influences the stability and burial potential of SOC across diverse ecosystems. To fully understand the carbon source/sink functions of soil, it is essential to comprehensively investigate the biogeochemical processes governing SOC sources, transformation, burial, and decomposition in terrestrial ecosystems under climate change. This review aims to provide a robust scientific foundation for future soil carbon management strategies and decision-making in support of carbon neutrality goals.

Key words: climate change, soil organic carbon, molecular composition and structure, stability, subsoil, terrestrial ecosystems, biogeochemical cycle

FAN Ya-Ran, XIA Shao-Pan, YU Bing-Bing, ZHU Zi-Qi, YANG Wei, FAN Yu-Chuan, LIU Xiao-Yu, ZHANG Xu-Hui, ZHENG Ju-Feng. Effects of elevated atmospheric CO₂ concentration and warming on stability of soil organic carbon pool accumulation, molecular composition and structure stability[J]. Chin J Plant Ecol, 2025, 49(7): 1053-1069.

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地点 Location	经纬度 Longitude and latitude	生态系统 Ecosystem	CO₂浓度升高 Elevated CO₂concentration		增温 Warming		CO₂浓度升高+增温 Elevated CO₂concentration and warming		参考文献 Reference
地点 Location	经纬度 Longitude and latitude	生态系统 Ecosystem	表层 Surface soil	底层 Subsoil	表层 Surface soil	底层 Subsoil	表层 Surface soil	底层 Subsoil	参考文献 Reference
伊利诺伊州, 美国 Illinois, USA	40.04° N 88.23° W	玉米 Zea mays	减少 Decrease	-	减少 Decrease	-	减少 Decrease	-	Black et al., 2017
纳尔逊农场, 美国 Nelson farm, USA	34.56° E 89.96° W	玉米/大豆 Zea mays/ Glycine max	增加 Increase	-	减少 Decrease	-	-	-	Lin & Zhang, 2012
巴特那东部地区 Patna eastern region	25.58° N 85.08° E	小麦 Triticum aestivum	减少 Decrease	-	减少 Decrease	-	减少 Decrease	-	Samal et al., 2020
芬兰东部 Eastern Finland	62.50° N 30.50° E	泥炭地 Peatland	增加 Increase	-	-	-	不变 Unchanged	-	Ge et al., 2012
俄克拉何马州, 美国 Oklahoma, USA	34.98° N 97.52° W	草原 Grassland	-	-	不变 Unchanged	-	-	-	Cheng et al., 2011
青藏高原, 中国 Qingzang Plateau, China	30.85° N 91.08° E	草原 Grassland	-	-	不变 Unchanged	-	-	-	Guan et al., 2018
加利福尼亚州, 美国 California, USA	38.91° N 120.66° W	森林 Forest	-	-	减少 Decrease	减少 Decrease	-	-	Ofiti et al., 2021
怀俄明州, 美国 Wyoming, USA	41.18° N 104.90° W	草地 Grassland	-	-	不变 Unchanged	-	减少 Decrease	-	Carrillo et al., 2018
哥本哈根, 丹麦 Copenhagen, Denmark	55.88° N 11.97° E	草地 Grassland	增加 Increase	-	减少 Decrease	-	增加 Increase	-	Vestergård et al., 2016
常熟, 中国 Changshu, China	31.50° N 120.55° E	稻田 Paddy soil	增加 Increase	-	增加 Increase	-	增加 Increase	-	Liu et al., 2021
明尼苏达州, 美国 Minnesota, USA	47.50° N 93.45° W	森林 Forest	-	-	不变 Unchanged	不变 Unchanged	不变 Unchanged	不变 Unchanged	Ofiti et al., 2022
加利福尼亚州, 美国 California, USA	38.91° N 120.66° W	森林 Forest	-	-	增加 Increase	减少 Decrease	-	-	Soong et al., 2021
青藏高原, 中国 Qingzang Plateau, China	34.85° N 92.93° E	高山草甸 Alpine meadow	-	-	不变 Unchanged	减少 Decrease	-	-	Ding et al., 2019
青藏高原, 中国 Qingzang Plateau, China	37.62° N 101.30° E	高山草甸 Alpine meadow	-	-	不变 Unchanged	-	-	-	Chen et al., 2022
常熟, 中国 Changshu, China	31.50° N 120.55° E	稻田 Paddy soil	增加 Increase	增加/不变 Increase/ unchanged	增加 Increase	减少 Decrease	增加 Increase	减少 Decrease	Fan et al., 2024

地点 Location	经纬度 Longitude and latitude	生态系统 Ecosystem	CO₂浓度升高 Elevated CO₂concentration		增温 Warming		CO₂浓度升高+增温 Elevated CO₂concentration and warming		参考文献 Reference
地点 Location	经纬度 Longitude and latitude	生态系统 Ecosystem	表层 Surface soil	底层 Subsoil	表层 Surface soil	底层 Subsoil	表层 Surface soil	底层 Subsoil	参考文献 Reference
伊利诺伊州, 美国 Illinois, USA	40.04° N 88.23° W	玉米 Zea mays	减少 Decrease	-	减少 Decrease	-	减少 Decrease	-	Black et al., 2017
纳尔逊农场, 美国 Nelson farm, USA	34.56° E 89.96° W	玉米/大豆 Zea mays/ Glycine max	增加 Increase	-	减少 Decrease	-	-	-	Lin & Zhang, 2012
巴特那东部地区 Patna eastern region	25.58° N 85.08° E	小麦 Triticum aestivum	减少 Decrease	-	减少 Decrease	-	减少 Decrease	-	Samal et al., 2020
芬兰东部 Eastern Finland	62.50° N 30.50° E	泥炭地 Peatland	增加 Increase	-	-	-	不变 Unchanged	-	Ge et al., 2012
俄克拉何马州, 美国 Oklahoma, USA	34.98° N 97.52° W	草原 Grassland	-	-	不变 Unchanged	-	-	-	Cheng et al., 2011
青藏高原, 中国 Qingzang Plateau, China	30.85° N 91.08° E	草原 Grassland	-	-	不变 Unchanged	-	-	-	Guan et al., 2018
加利福尼亚州, 美国 California, USA	38.91° N 120.66° W	森林 Forest	-	-	减少 Decrease	减少 Decrease	-	-	Ofiti et al., 2021
怀俄明州, 美国 Wyoming, USA	41.18° N 104.90° W	草地 Grassland	-	-	不变 Unchanged	-	减少 Decrease	-	Carrillo et al., 2018
哥本哈根, 丹麦 Copenhagen, Denmark	55.88° N 11.97° E	草地 Grassland	增加 Increase	-	减少 Decrease	-	增加 Increase	-	Vestergård et al., 2016
常熟, 中国 Changshu, China	31.50° N 120.55° E	稻田 Paddy soil	增加 Increase	-	增加 Increase	-	增加 Increase	-	Liu et al., 2021
明尼苏达州, 美国 Minnesota, USA	47.50° N 93.45° W	森林 Forest	-	-	不变 Unchanged	不变 Unchanged	不变 Unchanged	不变 Unchanged	Ofiti et al., 2022
加利福尼亚州, 美国 California, USA	38.91° N 120.66° W	森林 Forest	-	-	增加 Increase	减少 Decrease	-	-	Soong et al., 2021
青藏高原, 中国 Qingzang Plateau, China	34.85° N 92.93° E	高山草甸 Alpine meadow	-	-	不变 Unchanged	减少 Decrease	-	-	Ding et al., 2019
青藏高原, 中国 Qingzang Plateau, China	37.62° N 101.30° E	高山草甸 Alpine meadow	-	-	不变 Unchanged	-	-	-	Chen et al., 2022
常熟, 中国 Changshu, China	31.50° N 120.55° E	稻田 Paddy soil	增加 Increase	增加/不变 Increase/ unchanged	增加 Increase	减少 Decrease	增加 Increase	减少 Decrease	Fan et al., 2024

Effects of elevated atmospheric CO₂ concentration and warming on stability of soil organic carbon pool accumulation, molecular composition and structure stability

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