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首页> 外文期刊>Australian Journal of Botany >Regeneration of susceptible native species following a decline of Phytophthora cinnamomi over a period of 20 years on defined plots in the Grampians, Western Victoria.
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Regeneration of susceptible native species following a decline of Phytophthora cinnamomi over a period of 20 years on defined plots in the Grampians, Western Victoria.

机译：在维多利亚州西格兰比郡的特定地块上，疫霉疫霉在20年内下降之后，易感本地物种的再生。

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Regeneration of susceptible species, following a major decline in the population and distribution of the pathogen P. cinnamomi, was reported from a reassessment of infected plots in open forest, woodland and heathland of the Grampians, Victoria, Australia. The distribution of P. cinnamomi and changes in the vegetation were measured using quadrats from 1976-77 to 1984. In 1995, P. cinnamomi was detected in 15.6% of the 345 soil and root samples tested and was present in 28.6% of the infected quadrats compared with 100% of the samples and infected quadrats in all previous assessments. The restricted distribution, and the isolation of P. cinnamomi from susceptible species without symptoms, were considered evidence of changes in the disease associatedwith factors such as a reduced supply of susceptible host roots, or an alteration in pathogenicity or the environment. Changes in structure and species composition of infected plant communities were recorded and compared with those that remained pathogen-free, but few deaths or dieback symptoms occurred in 1995. In infected plots, several mature stringybark eucalyptus such as Eucalyptus baxteri and E. obliqua died, and the survivors had reduced crown density and dieback of the major branches. Regeneration in the form of 8-year-old saplings and young seedlings showed few or no symptoms despite the isolation of P. cinnamomi from the roots. The understorey of infected plots comprised a dense growth of field-resistant plants such as Leptospermum spp. andsedges entwined with dodder laurel, whereas the uninfected plots contained a species-rich heath flora of which 54% were known to be susceptible to P. cinnamomi. Regeneration and continuing survival of 24 susceptible species from 11 different families were recorded as small plants on various infected quadrats. However, 12 susceptible species from 7 different families failed to regenerate. It is suggested that pathogen populations increased with the renewed supply of susceptible roots, but independent ofpathogen potential, the emerging susceptible species could not compete effectively against the dense field-resistant understorey in infected plots in order to re-establish the original diverse heathland understorey.
机译：据报道，在澳大利亚维多利亚州格兰屏山脉的开阔森林，林地和荒地中，对感染地块的重新评估表明，在致病菌肉桂菌数量和分布大大减少之后，易感物种得以再生。使用1976-77年至1984年的四方测量了肉桂对虾的分布和植被的变化。在1995年，对345个土壤和根样品中的肉桂对虾的检出率为15.6％，在被感染者中占28.6％。与之前所有评估中100％的样本和感染的Quadrat相比有限的分布，以及从无症状的易感物种中分离出肉桂对虾，被认为是该疾病变化的证据，其与诸如易感宿主根的供应减少，致病性或环境改变等因素有关。记录受感染植物群落的结构和物种组成的变化，并与保持无病原体的变化进行比较，但是在1995年几乎没有死亡或死亡的症状。在受感染的土地上，一些成熟的弓形桉树（如桉树和斜纹桉）死亡，幸存者降低了树冠密度，减少了主要树枝的枯萎。尽管从根部分离出肉桂粉，但以8岁小树苗和年轻幼苗的形式再生几乎没有或没有症状。受感染地块的底层是密集生长的田间抗性植物，如Leptospermum spp。莎草与do月桂交织在一起，而未感染的地块则含有丰富的荒地菌群，其中已知有54％的人容易感染肉桂假单胞菌。来自11个不同科的24种易感物种的再生和持续生存被记录为各种感染的四足动物上的小植物。但是，来自7个不同科的12种易感物种未能再生。建议病原菌种群随着易感根的重新供应而增加，但是独立于病原体的潜力，正在出现的易感物种无法有效地与感染地中的高密度田间抗性林下竞争，以重建原始的荒地健康林下层。

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