Warming-dominated climate change impacts on soil organic carbon fractions and aggregate stability in Mollisols

doi:10.1016/j.geoderma.2023.116618

	Warming-dominated climate change impacts on soil organic carbon fractions and aggregate stability in Mollisols
	Zhou, Meng 1,2; Xiao, Yang 1,2; Zhang, Xingyi 1; Sui, Yueyu 1; Xiao, Leilei3 ; Lin, Jinkuo 4; Cruse, Richard M.5; Ding, Guangwei 6; Liu, Xiaobing 1,2,7
发表期刊	GEODERMA
ISSN	0016-7061
	2023-10-01
卷号	438 页码:14
关键词	Carbohydrate Lignin FTIR Solid-state13C NMR Particulate organic matter Silt and clay fractions
DOI	10.1016/j.geoderma.2023.116618
通讯作者	Liu, Xiaobing([email protected])
英文摘要	Mollisols contain high amounts of soil organic carbon (SOC), which is highly susceptible to climate change; thus, climate change could indirectly influence soil aggregate stability, but the dominant factor affecting aggregate stability remains controversial. Here, a soil transplanting test from high-latitude to low-latitude locations was initiated in 2004 to investigate the influences of warming-dominated climate change (approximately 3-4.7 celcius) on the quantity and molecular composition of OC fractions in surface (0-20 cm) soils, aggregate stability changes and underlying mechanisms. Different initial soil organic matter (SOM) contents of 50.6 g kg � 1 (SOM5), 58.8 g kg � 1 (SOM6), and 108.9 g kg- 1 (SOM11) were established in situ soils and in transplanted soils to simulate warming. The 15-year warming-dominated climate change presented no noticeable change in the SOC content in the lower SOM Mollisols (SOM5 and SOM6) but increased the SOC content by 13.3% in the higher SOM Mollisol (SOM11). In terms of labile OC fractions, warming-dominated climate change significantly increased the dissolved organic carbon (DOC) content by 20.1%-47.7% but reduced the easily oxidizable organic carbon (EOC) and microbial biomass carbon (MBC) contents by 22.1%-33.6%. Irrespective of any treatment, warming-dominated climate change decreased soil aggregate stability, as evidenced by the reduction in mean weight diameter (MWD) and geometric mean diameter (GMD) of 41.7%-79.3% and an increase in fractal dimension (D) of 28.6%-58.5%. For hierarchically organized soil aggregates, warming-dominated climate change increased the proportion and OC content of particulate organic matter inside free microaggregates (Fm-POM) as well as nonaggregated silt + clay-sized organic matter (nA-MOM). However, climate change decreased the proportion and OC content of silt + clay-sized fractions inside microaggregates within macroaggregates (mM-MOM). Of importance, warming-dominated climate change increased the amount of carbohydrates and decreased the amount of lignin in the mM-MOM, Fm-POM, and nAMOM fractions. Therefore, we speculated that chemical protection by mineral association within macroaggregates and nA-MOM fractions and physical protection by the occlusion of POM within free microaggregates might be the primary mechanisms for SOC stabilization under long-term climate change in Mollisols. The long-term warming-dominated climate change results demonstrated a positive effect on SOC content in higher SOM Mollisols, DOC, carbohydrate C, free microaggregate-associated C and nonaggregated silt + clay-sized associated C but exhibited a negative effect on EOC, MBC, lignin C, silt + clay-sized inside microaggregates within macroaggregates C and aggregate stability. These variables all contributed to the reduction in soil aggregate stability and might act as sensitive indicators of warming-dominated climate change in Mollisols, which in turn affect farmland ecosystem C fluxes in response to further climate change.
资助机构	National Key R amp;D Program of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Professional Association of the Alliance of International Science Organizations ; Excellent Young Program of the Natural Science Foundation of Heilongjiang Province in China
收录类别	SCI
语种	英语
关键词[WOS]	STATE C-13 NMR ; MICROBIAL COMMUNITY ; LAND-USE ; STABILIZATION MECHANISMS ; THERMAL-ACCLIMATION ; MATTER ; RESPIRATION ; TEMPERATURE ; POOLS ; MANAGEMENT
研究领域[WOS]	Agriculture
WOS记录号	WOS:001048977800001
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/36859
专题	中国科学院海岸带环境过程与生态修复重点实验室中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
通讯作者	Liu, Xiaobing
作者单位	1.Chinese Acad Sci, Northeast Inst Geog & Agroecol, State Key Lab Black Soils Conservat & Utilizat, Harbin 150081, Peoples R China 2.Northeast Agr Univ, Coll Resources & Environm, Harbin 150030, Peoples R China 3.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China 4.Shandong Normal Univ, Coll Geog & Environm, Jinan 250300, Peoples R China 5.Iowa State Univ, Dept Agron, Ames, IA USA 6.Northern State Univ, Chem Dept, Aberdeen, SD 57401 USA 7.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Harbin, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Meng,Xiao, Yang,Zhang, Xingyi,et al. Warming-dominated climate change impacts on soil organic carbon fractions and aggregate stability in Mollisols[J]. GEODERMA,2023,438:14.
APA	Zhou, Meng.,Xiao, Yang.,Zhang, Xingyi.,Sui, Yueyu.,Xiao, Leilei.,...&Liu, Xiaobing.(2023).Warming-dominated climate change impacts on soil organic carbon fractions and aggregate stability in Mollisols.GEODERMA,438,14.
MLA	Zhou, Meng,et al."Warming-dominated climate change impacts on soil organic carbon fractions and aggregate stability in Mollisols".GEODERMA 438(2023):14.