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在中国东北部温带森林中,土壤固态度调节的微生物碳利用效率在树叶球和散土之间

Beixing Duan^1,2, Ruihan Xiao^1,3

¹School of Hydraulic and Electric Power, Heilongjiang University, Harbin 150080, China.

Plants (Basel, Switzerland)

|February 27, 2026

概括

树根沉积显著改变了土壤营养物质的固态度,增加了森林树根球土壤中的微生物碳利用效率 (CUE). 树种通过不同的途径影响CUE,突出了根排液在调节土壤碳循环中的重要性.

科学领域:

森林生态森林生态
土壤科学土壤科学
微生物生态学微生物生态学

背景情况:

树根沉积 (Rhizodeposition) 在树根圈和散土之间产生营养梯度.
土壤固体测量影响微生物群落和碳利用效率 (CUE).
土壤固体测量变异对微生物CUE的调节作用尚不清楚.

研究的目的:

研究根球和散土之间的土壤固态度变化如何影响微生物CUE.
确定营养固体测量,微生物生物质,酶活动和社区组成对微生物CUE的综合影响.
阐明树木物种通过哪些不同的途径影响不同土壤组件中的微生物CUE.

主要方法:

分析了土壤C,N,P,以及它们在根球和散土中的比例.
测量了微生物生物质和细胞外酶活动 (BG,NAG,LAP,ACP).
使用16S rRNA和ITS基因测序来表征微生物群落.
采用结构方程建模 (SEM) 来识别因果路径.

主要成果:

观察到土壤营养素,固态度,微生物群落和根球和散土之间CUE的显著差异.
微生物CUE在根球土壤中高于所有树种的散土土壤.
树种通过根系球 (直接营养素固体测量) 和散土 (营养素和微生物生物质固体测量) 的不同途径影响了微生物CUE.

结论:

根根的根系沉积改变了土壤的稳定度失衡,影响了微生物CUE.
树种通过特定于土壤区的机制,通过不同的方式调节微生物CUE.
这些发现提高了对温带森林中植物-微生物-土壤相互作用和碳循环的理解.

关键词:

在CUE中,使用CUE.生态石化计生态石化计根茎的位置是根茎的位置.土壤微生物社区史泰基几何学失衡不平衡

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