STUDIES IN FOREST PATHOLOGY: X. DECAY OF WHITE PINE IN THE TIMAGAMI LAKE AND OTTAWA VALLEY AREAS
STUDIES IN FOREST PATHOLOGY: X. DECAY OF WHITE PINE IN THE TIMAGAMI LAKE AND OTTAWA VALLEY AREAS
复制标题
森林病理学研究：十、蒂马加米湖和渥太华谷地区白松的腐烂
作者：
L. T. White
对白松腐烂和衰败关系的研究是为了向安大略省森林当局提供管理偶龄林分所必需的信息。在位于偶数年龄的白松林中的10块1英亩的地块上，对1012棵白松树进行了检查，其中52%含有腐烂。年龄和衰败之间存在着明确的关系。随着年龄的增长，腐烂的树木比例逐渐增加，从60年生级的40%增加到220年生级的100%。可销售量损失从60年的4%增加到200年的40%。腐烂率与直径之间没有一致的关系。生长旺盛和生长不旺盛的树木腐烂的发生率大致相同，但在生长缓慢、生长不那么旺盛的树木中，腐烂造成的体积损失百分比要高得多。病理旋转以最大周期增量表示，为160~170年。比较了几种估算原木腐蚀量的方法。回归L。
The study of decay and decay relationships of white pine was undertaken to provide forest authorities in Ontario with information essential to the management of even-aged stands. Of 1012 white pine trees examined in 10 1-acre plots, located in even-aged white pine stands, 52% contained decay. A well-defined relationship existed between age and decay. The proportion of trees with decay increased gradually with age from 40% in the 60-year age class to 100% in the 220-year age class. The loss in merchantable volume increased from 4% at 60 years to 40% at 200 years. No consistent relationship between percentage of decay and diameter was found. The incidence of decay in vigorous and non-vigorous trees was about the same but the percentage of volume lost through decay was considerably higher in slow-growing, less vigorous trees. The pathological rotation, as indicated by the maximum periodic increment, was 160 to 170 years. A number of methods of estimating the volume of decay in logs are compared. Regression l...