Effects of stand age and soil microbial communities on soil respiration throughout the growth cycle of poplar plantations in northeastern China.

Our research demonstrated that stand age significantly affected Rs, showing a decreasing trend in the Rs rate as stand age increased ( Figure 1 ).

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The results indicate that as the stands mature, there is a general decrease in the abundance of nitrate-reducing bacteria involved in nitrogen transformation, while nitrogen-fixing bacteria show an increasing trend ( Supplementary Figure S5A ).

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