Arid
DOI10.1016/j.catena.2022.106721
Particulate and mineral-associated organic carbon fractions reveal the roles of soil aggregates under different land-use types in a karst faulted basin of China
Peng, Xiaoyu; Huang, Yong; Duan, Xingwu; Yang, Hua; Liu, Jiaxin
通讯作者Huang, Y
来源期刊CATENA
ISSN0341-8162
EISSN1872-6887
出版年2023
卷号220
英文摘要Soil aggregation has been recognized as the main mechanism of organic carbon (C; OC) stabilization, and OC dynamics within aggregates are closely linked to soil OC (SOC) sequestration. To unravel the roles of different -sized aggregates and the associated OC fractions in SOC accumulation, SOC stocks (SOCS), aggregate distribu-tions, and OC fractions within aggregates were measured under five typical land-use types (cropland, grassland, shrubland, plantation forest, and natural forest) in a karst faulted basin, China. Land-use type had distinct effects on SOCS in the topsoil (0-10 cm) and along the soil profile (0-60 cm), and the primary factors influencing SOCS varied with the soil horizons. Plantation forest had the highest SOCS (51.2 Mg C ha-1) in the topsoil, whereas the SOCS in shrubland (182.7 Mg C ha-1) was distinctively higher than those of other land-use types across the soil profile. Soil microbial biomass C and mean weight diameter were the major factors driving SOCS variation in the topsoil layer and the entire soil profile, respectively. OC content within macroaggregates (>0.25 mm) was significantly positively correlated with the SOC content of bulk soil, whereas only the mass proportion of large macroaggregates (>2 mm) showed a positive relationship with SOC. Additionally, mineral-associated OC (MAOC) was the dominant fraction of SOC and was abundant in macroaggregates. However, particulate OC (POC) within aggregates was relatively enriched in the topsoil and microaggregates. Considering the decom-position and distribution characteristics of OC fractions in different-sized aggregates, we suggest that the POC/ MAOC ratios of macro-and microaggregates could respectively reflect aggregate capacity to sequestrate MAOC and POC across different land-use types. Overall, shrubland is the optimal land-use type for rocky desertification control in the karst fault basin, due to the protection of POC and MAOC within different-sized aggregates.
英文关键词Soil organic carbon stocks Aggregate stability Particulate organic carbon Mineral-associated organic carbon Karst region
类型Article
语种英语
收录类别SCI-E
WOS记录号WOS:000885327400002
WOS关键词LOESS PLATEAU ; MATTER ; STABILIZATION ; VEGETATION ; GRASSLAND ; LITTER ; SEQUESTRATION ; STABILITY ; DECOMPOSITION ; PROTECTION
WOS类目Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向Geology ; Agriculture ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/395656
推荐引用方式
GB/T 7714
Peng, Xiaoyu,Huang, Yong,Duan, Xingwu,et al. Particulate and mineral-associated organic carbon fractions reveal the roles of soil aggregates under different land-use types in a karst faulted basin of China[J],2023,220.
APA Peng, Xiaoyu,Huang, Yong,Duan, Xingwu,Yang, Hua,&Liu, Jiaxin.(2023).Particulate and mineral-associated organic carbon fractions reveal the roles of soil aggregates under different land-use types in a karst faulted basin of China.CATENA,220.
MLA Peng, Xiaoyu,et al."Particulate and mineral-associated organic carbon fractions reveal the roles of soil aggregates under different land-use types in a karst faulted basin of China".CATENA 220(2023).
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