Barely Significant

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3.3 Total carbon storage of Populus planted forests of different ages The carbon storage of the arbor layer, soil layer and total carbon storage of poplar plantations with different stand ages all exhibited an increasing trend with the extension of stand age.
Over the time span from 2001 to 2022, accompanied by the increase in MAT, the percentage of herbaceous plants in plant communities and the pollen concentration both exhibited the characteristic of increasing as the soil depth decreased; correspondingly, the percentages of trees, ferns, and algae showed a decreasing trend as the soil depth decreased.