Forest management practices of Pinus tabulaeformis plantations alter soil organic carbon stability by adjusting microbial characteristics on the Loess Plateau of China.
Forest management practices of Pinus tabulaeformis plantations alter soil organic carbon stability by adjusting microbial characteristics on the Loess Plateau of China.
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DOI：
10.1016/j.scitotenv.2020.144209
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
Yahui Song;Jiaying Zhai;Jiaoyang Zhang;Leilei Qiao;Guoliang Wang;Lihui Ma;Sha Xue
中科院分区：
文献类型：
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作者：
Yahui Song;Jiaying Zhai;Jiaoyang Zhang;Leilei Qiao;Guoliang Wang;Lihui Ma;Sha Xue
可持续的管理做法可以提高土壤固碳的能力和潜力，大大有助于减缓区域气候变化。本文以油松人工林为研究对象，探讨了不同管理措施对油松人工林土壤微生物特征的影响，以明确微生物特征在影响土壤有机碳稳定性中的作用。选择1999年以来一直进行森林经营的黄土高原油松人工林。实施了五种森林管理措施：两种在森林水平上（有和没有地面凋落物的油松），三种在皆伐后使用不同的植被恢复方法（油松幼苗、废弃草地和天然灌木更新）。评价了微生物生物量、土壤呼吸、微生物群落结构、微生物代谢功能和土壤可氧化有机碳（OC）组分。森林经营措施通过调节土壤微生物群落多样性和微生物代谢功能多样性来改变土壤有机碳的稳定性。通径分析结果表明，微生物生物量对土壤可氧化有机碳组分的直接通径系数最大，为1.499。通径分析和冗余度分析表明，微生物生物量对土壤可氧化有机碳组分的直接影响最大。与其他森林经营措施相比，天然灌木更新通过提高土壤微生物特性，增加了土壤非活性碳组分，对稳定土壤有机碳贡献最大，增强了高原土壤生态系统的稳定性。微生物生物量是影响土壤有机碳稳定性的最大因素。而天然灌丛更新区土壤有机碳的稳定性可能最为稳定。
Sustainable management practices can enhance the capacity and potential for soil carbon (C) sequestration, significantly contributing towards mitigating regional climate change. Here, we investigated how the microbial characteristics of aPinus tabulaeformisplantation responded to different management practices to identify the role of microbial characteristics in influencing the stability of soil organic carbon (SOC). We chose aPinus tabulaeformisplantation on the Loess Plateau where forest management practices had been conducted since 1999. Five forest management practices were implemented: two at the forest level (P.tabulaeformiswith and without ground litter), and three using different vegetation restoration approaches after clear-cutting (P.tabulaeformisseedlings, abandoned grassland, and natural shrub regeneration). Microbial biomass, soil respiration, microbial community structure, microbial metabolic function, and soil oxidizable organic carbon (OC) fractions were evaluated. Forest management practices changed SOC stability by adjusting the microbial characteristics (e.g. soil microbial community diversity and microbial metabolic function diversity). The result of path analysis was that the direct path coefficient of microbial biomass on soil oxidizable OC fractions was the largest, which was 1.499. Path analysis and redundancy analysis showed that microbial biomass had the largest direct influence on soil oxidizable OC fractions. Compared with other forest management practices, natural shrub regeneration increased the nonlabile carbon fraction by increasing soil microbial characteristics, and contributed the most towards stabilizing SOC, which enhanced the stability of the soil ecosystem on the plateau. In conclusion, microbial biomass was the biggest influence factor of SOC stability. In contrast, the stability of SOC may be most stable in the area of natural shrub regeneration.