长期种植通过改变微生物网络复杂性和宏观聚合物的代谢活动来减少土壤碳储存
Shan Zhang1, Wanjin Hu1, Jinting Zhang1
1School of Life Sciences, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang 330022, China.
The Science of the total environment
|April 27, 2024
概括
长期种植显著减少土壤有机碳 (SOC) 储存,特别是在宏积聚物中. 宏观聚合物中的微生物群落转移是土中SOC损失的关键驱动因素.
科学领域:
- 农业科学 农业科学
- 土壤科学 土壤科学
- 微生物学 微生物学
背景情况:
- 种植实践显著影响土壤结构,微生物群落和碳捕集潜力.
- 了解种植对不同大小的土壤聚合物的土壤有机碳 (SOC) 储存的长期影响至关重要,但仍然不太了解.
研究的目的:
- 调查连续种植对在土的宏观和微观聚合物中储存SOC的长期影响.
- 阐明微生物机制,包括社区组成,网络模式,酶活动和碳利用效率 (CUE),这些机制控制了长期培养下的SOC动态.
主要方法:
- 在60至150年种植的四个米土壤中,SOC在宏积分 (>0.25毫米) 和微积分 (<0.25毫米) 中存储的特征.
- 分析微生物群落组成,微生物相互作用网络,细胞外酶活动和CUE.
- 应用部分最小平方路径建模来确定微生物属性与SOC存储之间的关系.
主要成果:
- 长期栽培导致SOC储存的平均减少45%,主要是在宏积聚物中.
- 宏积聚物相关微生物群落的变化解释了SOC储存中约80%的变化.
- 的组成和微生物网络复杂性的降低与SOC储存有很强的相关性,通过细胞外酶活性间接影响它. 细菌组成通过CUE间接调节SOC储存.
结论:
- 与宏积聚物相关的微生物相互作用和代谢活动对于在田中的SOC捕获至关重要.
- 旨在改善微生物属性的管理实践,特别是真菌群落和网络复杂性,可以提高SOC封存和农业生态系统的可持续性.
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