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Changes in fine root decomposition of primary Pinus koraiensis forest after clear cutting and restoration succession into secondary broad-leaved forest
Applied Soil Ecology ( IF 4.8 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.apsoil.2020.103785
Yanmei Fu , Fujuan Feng , Xiuyue Zhang , Dandan Qi

Abstract Fine root decomposition is one of the primary mechanisms by which nutrient uptake and C exchange occur in terrestrial ecosystems, which will be likely affected by forest succession. Herein, we compared the fine root decomposition rates of primary Korean pine forest (PK) and secondary broad-leaved forest (SF) using the litter bag method; then conducted an in-depth analysis of differences in the PK and SF fine root decomposition process. Our results demonstrated that the fine root decomposition in PK was significantly faster than that in SF. In general, the percent (%) mass of the main nutrient elements remaining in SF fine roots was significantly higher than that in PK, indicating that PK can more efficiently return soil nutrients through fine root decomposition. We also found that the succession of PF to SF induced significant alternation of the microbial community composition and decreased activities of soil enzymes. Structural equation modeling further demonstrated that fine root K and lignin were the key substrate-level factors affecting fine root decomposition, while actinomycetes and fungi PLFA biomass change played the most important role among all the functional groups. Finally, we determined that fine root degradation was driven by polyphenol oxidase and acid phosphatase enzymatic activities. This study elucidates the complex interactions between fine root substrate and soil physiochemical properties and demonstrates how they affect fine root decomposition via soil microorganisms. Given that these changes continue over long time scales, the secondary forest will experience increased difficulty return to the original primary Korean pine broad-leaved forest vegetation.

中文翻译:

红松原生林明伐恢复次生阔叶林后细根分解变化

摘要 细根分解是陆地生态系统养分吸收和碳交换的主要机制之一,可能会受到森林演替的影响。在此,我们使用垃圾袋法比较了原生红松林(PK)和次生阔叶林(SF)的细根分解率;然后对PK和SF细根分解过程的差异进行了深入分析。我们的结果表明,PK 中的细根分解明显快于 SF。一般来说,SF细根中残留的主要营养元素的质量百分比(%)明显高于PK中,表明PK可以通过细根分解更有效地返还土壤养分。我们还发现,PF 到 SF 的连续性诱导微生物群落组成的显着变化和土壤酶活性的降低。结构方程模型进一步表明细根 K 和木质素是影响细根分解的关键底物水平因素,而放线菌和真菌 PLFA 生物量变化在所有功能组中起最重要的作用。最后,我们确定细根降解是由多酚氧化酶和酸性磷酸酶酶活性驱动的。本研究阐明了细根基质与土壤理化特性之间复杂的相互作用,并展示了它们如何通过土壤微生物影响细根分解。鉴于这些变化会持续很长时间,
更新日期:2021-02-01
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