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    马尾松人工林混交改造下根系−菌丝−微生物互作对土壤磷转化的调控机制

    Regulatory mechanism of root-mycelial-microorganism interactions on soil phosphorus transformation of Pinus massoniana plantation under mixed renovation

      摘要
    • 摘要:
      目的 揭示复层异龄混交改造对马尾松人工林土壤磷组分转化的调控机制，为缓解针叶纯林连栽导致的土壤磷素限制及生态功能衰退提供理论支撑。
      方法 以马尾松纯林及其与红锥、格木构建的异龄混交林为研究对象，通过1.45 mm（根系 + 菌丝）、53 μm（仅菌丝）孔径根际限制装置，解析根系−菌丝−微生物互作对磷循环的影响。
      结果 （1）引入红锥和格木混交改造使马尾松人工林土壤总活性磷含量分别提升了41.34%、44.42%，使总中等活性磷含量分别提升了36.84%、40.26%。（2）较马尾松纯林，红锥−马尾松、格木−马尾松混交林中微生物生物量磷总含量分别显著增加91.21%、79.52%，酸性磷酸酶总活性分别显著增加86.25%、103.46%；土壤全氮、微生物生物量磷、亮氨酸氨基肽酶是调控土壤磷组分转化的主要环境因子。（3）仅增加菌丝参与后，马尾松纯林、红锥−马尾松混交林、格木−马尾松混交林3种林分土壤中磷素活化系数显著升高了24.37%、20.24%、20.69%。（4）与仅增加菌丝参与相比，根系输入导致纯林中总活性磷和总中等活性磷含量分别下降35.55%、30.25%，导致红锥和格木混交林中活性无机磷含量分别下降28.14%和34.59%。
      结论 马尾松混交林土壤磷组分的循环和转化受土壤微生物、酶活性和土壤氮素共同影响，根系对土壤中磷的转化起主要作用，根系和菌丝的相互作用能使其土壤中的微生物群落互作关系变得更加复杂，影响土壤磷的转化和有效性。

       

      Abstract:
      Objective This paper aims to reveal the regulation mechanisms of soil phosphorus fraction conversion in Pinus massoniana plantations under multi-layered, uneven-aged mixed transformation, providing theoretical support for alleviating soil phosphorus limitation and ecological function decline caused by continuous planting of coniferous pure forests.
      Method Using Pinus massoniana pure forest and its mixed plantation of different aged with Castanopsis hystri and Erythrophleum fordii as research object, the effects of root-mycelium-microbe interactions on phosphorus cycling were resolved by means of inter-root limiting devices with mesh sizes of 1.45 mm (root + mycelium) and 53 μm (mycelium).
      Result (1) Introducing Castanopsis hystri and Erythrophleum fordii mixed transformation into the pure forest, soil total labile phosphorus content was elevated by 41.34% and 44.42%, total moderately labile phosphorus content was elevated by 36.84% and 40.26%. (2) In the mixed forest, total microbial biomass phosphorus content was significantly increased by 91.21% and 79.52%, and the total acid phosphatase activity was significantly increased by 86.25% and 103.46%. Soil total nitrogen, total microbial biomass phosphorus, and L-leucine aminopeptidase were main environmental factors regulating the transformation of soil phosphorus fractions. (3) Only after increasing the involvement of mycelium, phosphorus activation coefficients in the soil of three stands were significantly increased by 24.37%, 20.24%, 20.69%, respectively. (4) Compared with only increasing mycelium involvement, root inputs resulted in total active phosphorus and total moderately active phosphorus in pure forests to decrease by 35.55% and 30.25%, respectively, and the active inorganic phosphorus in Castanopsis hystri and Erythrophleum fordii mixed forests to drop by 28.14% and 34.59%, respectively.
      Conclusion The cycling and transformation of soil phosphorus fractions in a mixed mosaic forest are influenced by soil microorganisms, enzyme activities, and soil nitrogen. Roots play a major role in transformation of phosphorus in soil, and the interaction between root system and mycelium can complicate the interactions of microbial communities in their soils, affecting the transformation and effectiveness of soil phosphorus.

       

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