Temporal dynamics of nutrient release from mulching of legume roots and shoots litter driven by microbial community during decomposition in organic orchards.

IF 4.8 2区 生物学 Q1 PLANT SCIENCES BMC Plant Biology Pub Date : 2025-03-24 DOI:10.1186/s12870-025-06392-2
Mingming Cai, Huimin Chen, Hua Tan, Jiaxuan Chen, Shubin He, Mingxiu Long
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Abstract

Grass residue decomposition is crucial for nutrient cycling in agro-ecosystems, enhancing nutrient utilization efficiency and supporting sustainable crop management. While grass mulching has been widely studied for improving orchard soil fertility, the role of soil microbial communities in decomposing different plant organs remains unclear. Before decomposition, the aboveground and belowground plant parts were harvested and placed in separate litterbags, which were later used for evaluating the decomposition rate and chemical characteristics of the shoots and roots for 40 days (at 10 days intervals). The changes in soil fertility, soil microenvironment, soil microbial community were measured after 0, 1 and 3 months, alongside analysis of key microbial taxa under different residues treatments. The remaining mass of root litter treatment was significantly higher than that of other treatments by 72.97%, 17.53% during 1-10 days and 30-40 days, respectively. During the 40-days period, the release of potassium (K) from root litter reached 58.61%, and the decomposition of lignin was recorded at 56.94%, whereas the release of carbon (C), nitrogen (N), and phosphorus (P) remained relatively stable. Despite no significant changes in nodes, edges, and links at 30 and 90 days, the co-occurrence network of root litter exhibited modularity values of 0.774 and 0.773, respectively. The values were higher than those observed in random networks, indicating the presence of functional modules and enhanced stability within the root microbial community. Litter organs enhanced decomposition rates by positively influencing soil fertility and keystone microbial decomposers, while its soil microenvironment affects decomposition rates. Despite its recalcitrance, the chemical composition of root litter plays a key role in regulating soil microbial community structure and improving soil fertility, thereby maintaining orchard ecosystem functionality.

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有机果园豆科植物根冠凋落物分解过程中微生物群落驱动下养分释放的时间动态
草渣分解对农业生态系统养分循环、提高养分利用效率和支持作物可持续经营具有重要意义。虽然草覆盖对果园土壤肥力的改善已经被广泛研究,但土壤微生物群落在分解不同植物器官中的作用尚不清楚。分解前,将地上和地下的植物部分收获,分别放入不同的垃圾袋中,然后用40天(间隔10天)的时间来评估茎和根的分解速率和化学特性。测定了不同残留物处理后0、1和3个月土壤肥力、土壤微环境、土壤微生物群落的变化,并分析了关键微生物类群。1-10 d和30-40 d处理的凋落根剩余质量分别显著高于其他处理72.97%、17.53%。40 d内,凋落根钾(K)释放量达到58.61%,木质素分解量达到56.94%,而碳(C)、氮(N)和磷(P)的释放量保持相对稳定。在30d和90d,凋落根共现网络的节点、边和链接均无显著变化,但其模块化值分别为0.774和0.773。这些值高于随机网络中观察到的值,表明存在功能模块,并增强了根系微生物群落的稳定性。凋落物各器官通过对土壤肥力和关键微生物分解体的正向影响促进凋落物分解速率,而其土壤微环境影响凋落物分解速率。根系凋落物的化学组成在调节土壤微生物群落结构、提高土壤肥力、维持果园生态系统功能方面发挥着关键作用。
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来源期刊
BMC Plant Biology
BMC Plant Biology 生物-植物科学
CiteScore
8.40
自引率
3.80%
发文量
539
审稿时长
3.8 months
期刊介绍: BMC Plant Biology is an open access, peer-reviewed journal that considers articles on all aspects of plant biology, including molecular, cellular, tissue, organ and whole organism research.
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