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• W4247619744 abstract "PDF HTML阅读 XML下载 导出引用 引用提醒 地形与竞争因子对红松胸径与年龄关系的影响 DOI: 10.5846/stxb201503090457 作者: 作者单位: 东北林业大学生态研究中心,东北林业大学生态研究中心 作者简介: 通讯作者: 中图分类号: 基金项目: 东北温带针阔混交林区生物多样性调查（2012FY112000） Influence of topography and competitive factors on the relationship between DBH and age of Korean pine Author: Affiliation: Northeast Forestry University,Northeast Forestry University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:森林年龄结构一直是森林生态学研究的重要内容之一，利用胸径指标间接推测树木年龄是获得森林年龄结构的有效手段。基于黑龙江省小兴安岭林区156株成熟红松解析木数据，分析成熟红松个体胸径与年龄之间关系，探讨地形与竞争因子对红松胸径与年龄关系的影响。研究结果表明：对所搜集的红松解析木数据，海拔、坡度、坡向、竞争因子等因素都对红松胸径与年龄关系产生影响，其中坡向与坡位对红松胸径-年龄关系影响最为明显，而竞争因子的影响较小并且在不同地形条件下表现出差异性。在南坡向-中坡位的红松个体，其胸径与年龄之间表现出了最佳的拟合效果。对地形与竞争因子的影响机理还有待于进一步研究。 Abstract:The ability to accurately age a forest has always been an important component of forest ecology research. Traditionally, the diameter of a tree at breast height (DBH) has been used to estimate tree age and subsequently identify the age structure of a forest. Unfortunately, the DBH index is not an accurate estimator of tree age for natural Korean pines (Pinus koraiensis) because of the complexity of spatial distribution and different developmental stages of this species. Previous studies have examined the relationship between DBH and age of natural Korean pines using a simple regression analysis. In our study, the wood data of 156 mature Korean pines in the Lesser Khingan Mountains of the Heilongjiang province was collected to analyze the relationship between DBH and age of Korean pine, as well as the influences of topographic and competition factors. In our wood data analysis, we preformed simple regression matching with an exponential model to better suit the biological significance and distributional characteristics of age for natural Korean pines. In addition, we adopted the widely used Hegyi simple competition index (CI) and improved Basal-Area-in-Larger Trees (WBAL) as competition indexes. We imported the competition indexes into the (DBH-age) regression equation and analyzed them by different slopes and slope positions using multiple regression analysis to understand how topography and competitive factors influence the relationship between DBH and age of natural Korean pines. Our results showed that the Pearson correlation coefficient of DBH and age was 0.562, and for our wood data collected and analyzed, the linear correlation between the DBH and age was not high. When we fit our wood data with exponential models the determination coefficient R2 was only 0.507. However, when we imported the competition indexes for multiple regression analysis, the adjusted determination coefficient of the regression model increased to 0.542; when we imported the WBAL index, the fitting effect of DBH-age improved to 0.583. We conducted fitting analysis using different slopes and slope positions and found that natural Korean pines in the middle slope and southward slopes showed the best fitting effects between the DBH and age. However, after importing the competition factors, we significantly improved our precision in estimating age, especially with pines in the northward and westward slopes. For example, after WBAL was imported, the determination coefficient for DBH and age increased by 0.355 and 0.269, respectively. Our study found that altitude, slope, aspect, and competition factors could all influence the relationship between DBH and age of natural Korean pines. Among them the aspect and slope position had the strongest influence; however, the competition factors showed limited influence, depending on topography. However, the underlying mechanism of effects of topography and competitive factors on the relationship between DBH and age of Korean pine is complicated. This article has only carried on the preliminary exploration. More investigations should be conducted in the future to further improve fitness of the relationship between DBH and age of Korean pine. 参考文献 相似文献 引证文献" @default.
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• W4247619744 date "2016-01-01" @default.
• W4247619744 modified "2023-09-25" @default.
• W4247619744 title "Influence of topography and competitive factors on the relationship between DBH and age of Korean pine" @default.
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