文献类型：期刊文献

英文题名：Continuous cropping of cut chrysanthemum reduces rhizospheric soil microbial populations, diversity and network complexity

作者：Li, Jun[1]; Cheng, Xiaoyu[1]; Chen, Wei[1]; Zhang, Hanjie[1]; Chen, Tianlang[2]; Chu, Guixin[1]; Tao, Rui[1]

机构：[1] Shaoxing University, China; [2] Zhejiang Haifeng Biotechnology Co., LTD, China

年份：2021

外文期刊名：ResearchSquare

收录：EI(收录号：20220129508)

语种：英文

外文关键词：Alkalinity - Bacteria - Complex networks - Enzyme activity - Organic carbon - Phosphatases

外文摘要：Continuous cropping of cut chrysanthemum causes soil degradation and chrysanthemum quality decline, but the biotic and abiotic mechanisms behind it remain unclear. This impedes our ability to assess the true effects of continuous cropping on agricultural soil functions and our ability to repair impaired soils. Here we examined the impact of different replanting years on microbial communities and enzyme activities in rhizosphere soil of cut chrysanthemum (Chrysanthemum morifolium). Our results showed that soil total nitrogen (TN) and organic carbon (SOC) contents were significantly lower in the soil with 12 years of continuous cropping (Y12) than that in the soil with 1 year of cropping (Y1). Compared with Y1, Y12 treatment decreased alkaline phosphatase and β -glucosidase by 12.1 and 24.4%, but increased the activities of soil urease and catalase by 98e0be.2 and 34.8e0be%, respectively. Soil bacterial populations in Y6 (continuous cropping for 6 years) and Y12 treatments decreased by 52.3 and 8e0be7.5% compared with that in Y1 treatment. Moreover, the bacterial α-diversity (Shannon index) significantly decreased by 37.3 and 57.6% over 6 and 12 years of continuous cropping, respectively. Long-term monoculture cropping shifted the bacterial community composition, with decreased abundances of dominant phyla such as Proteobacteria and Acidobacteria, but with an increase in the relative abundances of Actinobacteria and Chloroflexi, and Gemmatimonadetes. Moreover, Y6 and Y12 treatments harbored less microbial network complexity, lower bacterial taxa, and fewer linkages among bacterial taxa, relative to Y1. Soil pH, SOC, and TN were the main edaphic factors affecting soil bacterial community compositions and diversity. Overall, our results demonstrate that continuous cropping has a significant negative impact on soil microbial diversity and complexity. ? 2021, CC BY.