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首页> 外文期刊>Forest Ecology and Management >The effect of reduced phosphorus concentration on mycorrhizal development and growth of Eucalyptus globulus Labill. seedlings inoculated with 10 different fungi.
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The effect of reduced phosphorus concentration on mycorrhizal development and growth of Eucalyptus globulus Labill. seedlings inoculated with 10 different fungi.

机译：磷浓度降低对蓝桉的菌根发育和生长的影响。幼苗接种了10种不同的真菌。

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摘要

In order to improve the procedure for selecting effective mycorrhizal inoculants for fast-growing eucalypts, a wide range of isolates associated with Eucalyptus globulus was tested at 2 contrasting nutrient regimes, representative of that present following outplanting (i.e. post-fertilization) and that likely to occur 1-2 years later when soil nutrient concentrations will have returned to a much lower level. It was felt that this would provide a more accurate prediction of the potential performanceof selected isolates during early plantation establishment. During an initial 12-week period, representative of the nursery phase, seedlings of Eucalyptus globulus, pre-inoculated with 10 different mycorrhizal fungi (Pisolithus tinctorius, Laccaria fraterna, Hymenogaster albus (2 isolates), Scleroderma areolatum (2 isolates), Hydnangium carneum (4 isolates)), were given optimal nutrients to encourage the development of mycorrhizas. At the end of this period, 6 of the 18 replicate plants were harvestedand assessed for shoot growth and mycorrhizal infection while the remainder received for a further 12 weeks 2 different nutrient solutions (10 and 3 mg P litre-1). When these plants were harvested at 24 weeks, shoot growth and mycorrhizal development were again assessed. At the end of the first phase (0-12 weeks), all seedlings, irrespective of fungal inoculant, had become mycorrhizal. However, the extent of mycorrhizal infection achieved by the 10 different fungi ranged from 1.4 to 40.7%. Significant differences were also found between the fungi in their effect on stem diameter, stem dry weight and shoot dry weight, but not their effect on stem height or leaf dry weight. When assessed at 24 weeks, mycorrhizal development ranged from 22.3 to 77.7% on seedlings given 10 mg P litre-1 and 23.1-77.3% for those given 3 mg P litre-1. Three of the 10 fungi formed >50% infection on seedlings, irrespective of the nutrient regime applied. Most of the fungi formed higher levels of infection on seedlings given 10mg P litre-1; however, 2 isolates formed higher levels of infection on seedlings given 3 mg P litre-1. Infection by 9 of the 10 isolates led to a significant increase in leaf and shoot dry weight by seedlings given 10 mg P litre-1 in comparison to thosewhich received 3 mg P litre-1. However, inoculation with the remaining fungus, an isolate of Pisolithus tinctorius, led to seedlings given 3 mg P litre-1 forming shoots as large as those attained by plants given the higher P regime. The results indicatethat isolates can be selected with the potential to achieve significant gains over a broad spectrum of nutrient concentrations. The implications for improving the establishment of E. globulus plantations at a wide spectrum of outplanting sites is discussed.
机译：为了改进为快速生长的桉树选择有效的菌根接种剂的程序，在两种不同的养分方案下测试了与桉树相关的多种分离株，这些方案代表了移栽后（即受精后）存在的代表性1-2年后发生，那时土壤养分浓度将恢复到更低的水平。人们认为，这将为人工林早期建立过程中选定菌株的潜在性能提供更准确的预测。在最初的12周期间（代表苗圃阶段），预先接种了10种不同的菌根真菌（Pisolithus tinctorius，Laccaria fraterna，Hymenogaster albus（2个分离物），Soleroderma areolatum（2个分离物），Hydnangium carneum （4个分离株））被给予了最佳的营养以鼓励菌根的发展。在此阶段结束时，收获了18株复制植物中的6株，并评估了其生长和菌根感染，而其余的则分别接受了12周的2种不同营养液（10和3 mg P litre-1）。当这些植物在第24周收获时，再次评估其生长和菌根发育。在第一阶段结束时（0-12周），所有幼苗，不论是否有真菌接种物，均已成为菌根。但是，由10种不同的真菌获得的菌根感染程度为1.4％至40.7％。在真菌对茎直径，茎干重和苗干重的影响之间也发现了显着差异，但对茎高或叶片干重的影响没有差异。当在第24周进行评估时，给予10 mg P litre-1的幼苗的菌根发育范围为22.3％至77.7％，给予3 mg P litre-1的幼苗的菌根发育范围为23.1-77.3％。 10种真菌中有3种在幼苗上的感染率均> 50％，而与所采用的养分状况无关。给予10 mg P litre-1的大多数真菌在幼苗上形成较高的感染水平。然而，在给予3 mg P litre-1的情况下，有2种分离株对幼苗的感染程度更高。 10个分离株中有9个被感染后，给予10 mg P litre-1的幼苗与接受3 mg P litre-1的幼苗相比，叶片和枝条干重显着增加。然而，用剩余的真菌（Pisolithus tinctorius的分离株）进行接种，导致幼苗获得3 mg P litre-1的芽，其形成的芽与采用较高P方案的植物所获得的芽一样大。结果表明，可以选择在较大范围的营养物浓度下具有显着增加潜力的分离株。讨论了改善在广泛的外植点上建立小球藻人工林的意义。

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