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磷添加和接种菌根菌对马尾松不同家系容器苗的生长及磷素利用效应

Effects of Phosphorus Addition and Inoculation of Mycorrhizal Fungi on the Growth and Phosphorus Utilization of Masson Pine Container Seedlings from Different Families

    摘要
  • 摘要:
    目的 研究不同遗传背景马尾松二代家系容器苗在磷添加和接种菌根菌相互作用下的生长及磷吸收利用差异，为马尾松优质容器苗精准培育提供科学依据。
    方法 以3个具有不同遗传背景的马尾松二代家系容器苗为材料，在低P（50 g·m−3基质）和高P（900 g·m−3基质）2个小区内，分别设置接种和不接种菌根菌2个处理，分析马尾松不同家系容器苗生长及磷素利用差异。
    结果 磷添加对3个家系马尾松容器苗各生长指标及各器官P吸收利用均有促进作用，容器苗苗高、地径、整株干质量、整株P含量和吸收量高P水平较低P水平分别增加8.70%、21.73%、61.62%、30.25%和112.08%，高径比和根冠比降低10.62%和19.82%。接种菌根菌后，容器苗苗高、地径、整株干质量和整株P吸收量相比不接种分别增加2.34%、6.40%、20.69%和18.08%，高径比、根冠比和整株P含量分别降低4.09%、3.87%和3.23%。接种菌根菌可减小马尾松容器苗不同磷添加水平下地径和根冠比的差异，同时减小不同家系间的生长差异。磷添加 × 接种菌根菌对马尾松容器苗茎和根P吸收量有显著促进作用，高P水平下接种菌根菌对生长的促进作用更明显。不同家系对磷添加和菌根处理的生长响应不同，53号家系对磷添加最敏感，15号家系对接种菌根菌最敏感，37号家系较均衡。
    结论 马尾松容器苗磷添加效应较家系和菌根处理明显，生产中可根据3个家系对磷肥的不同响应合理施肥，同时通过接种菌根菌提高磷肥利用效率。

     

    Abstract:
    Objective To study the differences of growth and phosphorus absorption and utilization of second-generation families of masson pine (Pinus massoniana) container seedlings with different genetic background under the interaction of different phosphorus addition amount and inoculation of mycorrhizal fungi so as to provide guidance for precise cultivation of high-quality P. massoniana container seedlings,.
    Method Three second-generation families of P. massoniana with different genetic backgrounds were used as materials to observe and analyze the differences in growth and phosphorus utilization of different families of P. massoniana under two phosphorus addition levels (low P: 50 g·m−3 substrate, high P: 900 g·m−3 substrate) in two plots inoculated with mycorrhizal fungi and without inoculation.
    Result The results showed that phosphorus addition promoted the growth, P content and P uptake in all organs of P. massoniana container seedlings from three families. The seeding height, caliper, whole plant dry matter, whole plant P content and P uptake of container seedlings with high P level were 8.70%, 21.73%, 61.62%, 30.25% and 112.08% higher than those with low P level, while the height-diameter ratio and root-shoot ratio were 10.62% and 19.82% lower. After inoculation, the seedling height, caliper, whole plant dry matter and whole plant P uptake increased by 2.34%, 6.40%, 20.69% and 18.08%, while the height-diameter ratio, root-shoot ratio and whole plant P content decreased by 4.09%, 3.87% and 3.23% respectively. Mycorrhizal fungi could reduce the differences of caliper and root-shoot ratio among different phosphorus addition levels, and the growth differences among families. The interaction of phosphorus addition and mycorrhizal fungi significantly promoted the P uptake of container seedlings stem and root, and mycorrhizal fungi promoted the growth of P. massoniana container seedlings more significantly at high P levels. The growth responses of different families to different phosphorus addition and mycorrhizal treatments were different. The effect of phosphorus addition on family No. 15 was the most significant, and that of mycorrhizal inoculation on family No. 53 was the most significant. Family No.37 was more balanced.
    Conclusion The effect of phosphorus addition is more obvious than that of families and mycorrhizal treatments. In order to further improve the cultivation level of P. massoniana container seedlings, reasonable fertilization should be carried out according to the different responses of three families to phosphorus fertilizer, and the P utilization efficiency can be improved by inoculating mycorrhizal fungi.

     

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