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Distribution and gradient analysis of Ink disease in chestnut forests

机译：板栗林油墨病的分布与梯度分析

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Distribution and gradient analysis of Ink disease caused by Phytophthora cambivora were studied over a 2 years period in a chestnut forest in Italy. Ink disease incidence, severity and tree mortality increased during the period over the studied chestnut forest. Disease descriptors and landform datasets were analysed by Geographic Information System software and displayed as a multilayer thematic map. Indices of dispersion and empirical dispersion models were used to study spatial distribution of disease in the investigated area. Semivariograms were used to interpolate spatial data and to map Ink disease. A logical spatial dependence of the studied variables was found. Ink disease occurred preferentially along natural drainages routes where multicyclic inoculum build up was likely to occur. A negative relationship was found between Ink disease incidence, severity and tree mortality with respect to distance from the drainage.
机译：在意大利的一个板栗林中研究了由冈比亚疫霉（Phytophthora cambivora）引起的水墨病的分布和梯度分析，历时两年。在所研究的板栗林期内，墨水病的发病率，严重程度和树木死亡率均增加。疾病描述符和地貌数据集通过地理信息系统软件进行了分析，并显示为多层主题地图。使用散布指数和经验散布模型来研究研究区域内疾病的空间分布。半变异函数用于插值空间数据并绘制墨水病害图。发现研究变量的逻辑空间依赖性。墨水疾病优先发生在自然排水路线上，那里可能会发生多环菌接种。发现与距离排水口的距离有关的墨水病发病率，严重程度和树木死亡率之间存在负相关关系。

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