Pore connectivity and anisotropy affect carbon mineralization via extracellular enzymes in > 2 mm aggregates under conservation tillage of Mollisols

doi:10.1016/j.still.2024.106253

	Pore connectivity and anisotropy affect carbon mineralization via extracellular enzymes in > 2 mm aggregates under conservation tillage of Mollisols
	Xiao, Yang 1; Zhou, Meng 1,5; Liu, Xiaobing 1; Zhang, Xingyi 1; Xiao, Leilei2 ; Liu, Jian 3; Cruse, Richard M.4
发表期刊	SOIL & TILLAGE RESEARCH
ISSN	0167-1987
	2024-12-01
卷号	244 页码:12
关键词	Conservation tillage Computed tomography Pore shape Carbon sequestration beta-glucosidase beta-xylosidase
DOI	10.1016/j.still.2024.106253
通讯作者	Zhou, Meng([email protected])
英文摘要	Soil aggregates, which are the basic units of soil structure, play an important role in the carbon cycle of ecosystems. The pore characteristics of aggregates influence soil organic carbon sequestration. However, studies on SOC mechanisms in aggregates have been limited to Mollisols. This study was conducted as a long-term experiment established in 2004 with a corn-soybean rotation in Mollisols. There are three treatments, including rotary tillage without straw return (conventional tillage, CT), subsoiling without straw return (reduced tillage, RT), and no tillage with straw return (NT). The soil pore size distribution, shape parameters, extracellular enzymes activity, and carbon mineralization were measured. The results showed that 15-year no tillage and reduced tillage increased the total porosity and proportion of larger pores, but significantly decreased the proportion of smaller pores in situ soil columns. Conventional tillage exhibited the most complex pores because of the highest pore fractal dimension (2.75-2.90), anisotropy (0.366-0.516), and the lowest sphericity (5.1-28.7). As for the soil columns filled with > 2 mm aggregates, reduced tillage significantly increased the pore connectivity by 3.02-3.62 %, whereas no tillage had no effect. The structural equation modelling indicated that in soil columns filled with > 2 mm aggregates, pore shape parameters, particularly connectivity and anisotropy, positively influenced the activities of beta-glucosidase and beta-xylosidase directly, and positively affected soil carbon mineralization by influencing extracellular enzymes activity indirectly. The findings emphasize the importance of pore shape parameters effect on soil carbon sequestration, and will be helpful in comprehending the microscopic mechanisms of soil carbon sequestration in > 2 mm aggregates.
资助机构	Jilin Province in China ; Strategic Priority Research Program of the Chinese Academy of Sciences
收录类别	SCI
语种	英语
关键词[WOS]	SOIL ORGANIC-MATTER ; MANAGEMENT ; SIZE ; STABILITY ; SEQUESTRATION ; FRACTIONS ; EROSION ; RATES ; BIOTA ; BONE
研究领域[WOS]	Agriculture
WOS记录号	WOS:001289972600001
引用统计
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/35792
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	Zhou, Meng
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.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China 3.Dezhou Univ, Inst Biophys, Shandong Key Lab Biophys, Dezhou 253023, Peoples R China 4.Iowa State Univ, Dept Agron, Ames, IA USA 5.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Harbin 151800, Peoples R China
推荐引用方式 GB/T 7714	Xiao, Yang,Zhou, Meng,Liu, Xiaobing,et al. Pore connectivity and anisotropy affect carbon mineralization via extracellular enzymes in > 2 mm aggregates under conservation tillage of Mollisols[J]. SOIL & TILLAGE RESEARCH,2024,244:12.
APA	Xiao, Yang.,Zhou, Meng.,Liu, Xiaobing.,Zhang, Xingyi.,Xiao, Leilei.,...&Cruse, Richard M..(2024).Pore connectivity and anisotropy affect carbon mineralization via extracellular enzymes in > 2 mm aggregates under conservation tillage of Mollisols.SOIL & TILLAGE RESEARCH,244,12.
MLA	Xiao, Yang,et al."Pore connectivity and anisotropy affect carbon mineralization via extracellular enzymes in > 2 mm aggregates under conservation tillage of Mollisols".SOIL & TILLAGE RESEARCH 244(2024):12.