您好，欢迎访问中国农业科学院 机构知识库！

全部

  • 全部
  • 标题
  • 学者
  • 机构
  • 关键词

Divergent effects of biomass-derived carbon dots application and sweetpotato planting on accumulations of soil microbial necromass carbon in Vertisol

文献类型： 外文期刊

作者： Wang, Jing 1 ; Zhu, Meng 1 ; Zhu, Xiaoya 1 ; Zhang, Qiangqiang 1 ; Yu, Yongchao 1 ; Zhao, Peng 1 ; Liu, Ming 1 ; Jin, Rong 1 ; Tang, Zhonghou 1 ;

作者机构： 1.Chinese Acad Agr Sci, Xuzhou Inst Agr Sci Xuhuai Dist Jiangsu, Natl Agr Expt Stn Soil Qual Xuzhou, Sweetpotato Res Inst, Xuzhou 221131, Peoples R China

关键词： Soil microbial necromass; Carbon dots; Sweetpotato; Soil organic carbon; Microbial community structure

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.0； 五年影响因子：5.4 ）

ISSN： 0929-1393

年卷期： 2025 年 210 卷

页码：

收录情况： SCI

摘要： Biomass-derived nano carbon dots (CDs) application and sweetpotato (SP) planting can alter soil microbial community structure. However, the impact of these treatments on soil microbial necromass carbon (MNC) and associated mechanisms remains unclear. In this study, we combined pot experiments and laboratory analyses to assess soil physicochemical properties, microbial community characteristics, metabolic enzyme activity and multivariate correlations, aiming to explore the determinants of soil MNC accumulation in Vertisol following CDs application and SP planting. The results showed inconsistent effects of CDs application on soil bacterial and fungal necromass C content. Although CDs application increased bacterial richness and the relative abundances of Proteobacteria, Firmicutes and Cyanobacteria in the absence of SP planting, it failed to enhance bacterial necromass C accumulation. In contrast, CDs application improved soil fungal necromass C content regardless of SP planting. Besides directly increasing soil organic carbon (SOC) concentrations, both CDs application and SP planting enhanced the contributions of fungal necromass C to SOC. However, SP planting neither increased soil dissolved organic carbon (DOC) nor altered the compound contents in DOC solution. Extracellular enzymes related to C-cycling (e.g., (3-alpha-cellobiohydrolase and (3-1,4-xylosidase) also significantly diminished under SP planting without CDs application. Linear discriminant analysis (LDA) identified distinct bacterial and fungal genera between the CDs application and SP planting treatments. Structural equation models (SEMs) revealed that the reduced accumulation of bacterial necromass C was primarily driven by increased (3-1,4-glucosidase activity and shifted in bacterial community composition, which limited microbial substrate utilization and growth. The increased fungal necromass C accumulation was attributed to altering fungal community structure and decreasing alpha-diversity, which promoted necromass formation through sequential assimilation, synthesis, and turnover of CDs and SP carbon inputs. These results highlight the differential responses of bacterial and fungal necromass accumulation to CDs application and SP planting, providing novel insights into the regulatory roles of nano CDs and plant-microbe interactions in SOC sequestration processes in Vertisol.

  • 相关文献
作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：中国农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台