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首页> 外文期刊>Silva Fennica >Assessing the incidence of butt rot in Norway spruce in southern Finland.
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Assessing the incidence of butt rot in Norway spruce in southern Finland.

机译：评估芬兰南部云杉中挪威云杉的腐烂发生率。

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The aim of this study was to analyse the occurrence of butt rot damage to Norway spruce (Picea abies) in different parts of southern Finland and to quantify the associated loss of quality. The data used in the study are from the 9th National Forest Inventory and consist of 5998 sample plots and 8007 spruce sample trees of saw-timber size. To predict the probability of damage to stands and trees, logistic regression models were constructed. Separate models were made for the whole study area, for the area where the general risk of Heterobasidion root and butt rot damage is high and for the area where the damage frequency is relatively low. In the high-risk area, the probability of damage decreased with increasing elevation and increased with increasing temperature sum. In addition, damage was more common on fertile sites and less common on peatlands; and thick peat layer decreased the risk of damage. The probability of damage was also higher in stands where special or selective cuttings had been carried out. In the sample tree data, the probability of damage increased slightly with increasing diameter and age of the tree. In the low-risk areas, elevation was the only variable that explained the probability of damage to a spruce tree. Site fertility and previous cuttings (more than ten years ago) explained the probability of damage to stands only weakly. For spruce damaged by butt rot, the saw-timber volume was reduced, on average, by 60% both in the high-risk area and in the low-risk area..
机译：这项研究的目的是分析在芬兰南部不同地区对挪威云杉（Picea abies）发生的对接腐烂损害并量化相关的质量损失。研究中使用的数据来自第9届国家森林清单，包括5998个样地和8007个锯木大小的云杉样品树。为了预测林分和树木受损的可能性，构建了逻辑回归模型。针对整个研究区域，异源异位根和臀部腐烂的一般风险较高的区域以及伤害频率相对较低的区域分别建立了模型。在高风险地区，破坏的可能性随着海拔的升高而降低，而随着温度和的升高而升高。此外，损害在肥沃的地区更为普遍，而在泥炭地则较少。较厚的泥炭层降低了损坏的风险。在进行了特殊或选择性切割的林分中，受损的可能性也更高。在样本树木数据中，损坏的可能性随树木直径和树龄的增加而略有增加。在低风险地区，海拔是唯一可以解释云杉树木受损可能性的变量。场地肥力和先前的砍伐（十多年前）解释了林分受损的可能性很小。对于因对接腐烂而损坏的云杉，高风险地区和低风险地区的锯材平均减少了60％。

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