西澳州桉树林地土壤菌根菌剂接种潜力研究(英文)

对澳大利亚西澳州桉树人工林菌根类型及其形成情况进行了调查 ,并采用生物测定法 (Bioas saymeasurement)研究了桉树林地土壤菌根菌剂的接种潜力 .根系菌根检查和生物测定法试验均表明 ,在自然条件下桉树可以和不同真菌共生而形成三种类型的菌根 ,即外生菌根、VA菌根和混合菌根 ;林分成熟程度与菌根形成有一定的相关性 ,与共生体的类型也有一定影响 .在幼林中 ,桉树根系主要与内囊霉菌共生形成VA菌根 ,而成熟林主要与担子菌共生形成外生菌根 ,混合菌根表现为一种中间类型 .在收集的林地土壤中移植的菌根诱饵植物 (三叶草和蓝桉 )分别检测出土壤中存在有一定量的VA菌根菌和外生菌根菌 ,但菌根菌繁殖体数量及接种潜力相对较小 ,并且也揭示了按树年龄对土壤菌剂的相对接种潜力影响较大 .本文对桉树人工林土壤菌剂接种潜力进行了评价 ,并就引进优良菌根菌对桉树人工林生产的重要性进行讨论

Bioassay Measurements of Mycorrhizal Inoculum in Soils from Eucalyptus Plantations of Varying Ages in Western Australia

Bioassay measurement was used to estimate the inoculum potential of mycorrhizal fungi in intact soils collected from Eucalyptus plantations of varying ages in Western Australia. The results showed that both ectomycorrhizal (ECM) and vesicular|arbuscular mycorrhizal (VAM) fungi existed in soils from most plantation sites according to two bait plants(clover for VAM and Eucalyptus for ECM). The levels of ECM or VAM fungal inoculum were considered to be moderate.Analysis of roots sampled from plantations suggest that Eucalyptus stands are more associated with VAM fungi compared to ECM fungi that occupied most fine roots in older stands.Information from the bioassay experiment suggests that there may be a need for the introduction of a wider range of inoculum to assist the establishment of new Eucalyptus plantations in this region. Further work is required on below|ground ECM fungal diversity in these plantations.