Aging mistakes and overestimation of productivity for black spruce forests

黑云杉林的老化错误和生产力高估

• 批准号: 445212-2012
• 负责人: DesRochers, Annie
• 金额: $ 1.95万
• 依托单位: Université du Québec en Abitibi-Témiscamingue
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=575029
• 关键词: Aging; mistakes; overestimation; productivity; black

Characterization of forest dynamics, forest management planning and yield tables are all based on age-productivity relationships (site quality indices). However, it was previously shown that age of black spruce (Picea mariana) obtained by a ring count at ground level (commonly referred to as «the root collar») does not give the real age of trees, because of the development of adventitious roots along the base of the stem. At maturity, the root system of black spruce trees is exclusively adventitious, which means that the initial roots do not develop and disappear with time. The development of roots along the stem somewhat «hides» the true age of trees, by concealing growth rings and the root collar into the stump wood and under the roots. Since the characterization of forest dynamics and estimations of productivity mainly lie on the age of trees, when ages are wrong, those estimates are also wrong and can lead to bad decisions by managers. For example, a forest stand could be much older than it appears from a ring count at ground level, which automatically leads to productivity overestimations and erroneous management decisions. The main goal of this research project is to estimate aging mistakes of black spruce growing in different conditions, to use these estimates to quantify productivity overestimations and to develop a correction tool for yield tables and site indices. By locating the germination date (true age) concealed inside black spruce stumps, we will calculate precise age underestimations and associated productivity overestimations. On a fundamental level, we expect to determine conditions favourable to the development of adventitious roots, and hence site conditions that increase age underestimations. On an applied level, the quantification of productivity overestimations associated to aging errors will give managers better data on which to base their planning decisions.

森林动态，森林管理计划和产量表的表征均基于年龄生产率关系（现场质量指数）。但是，以前表明，由于沿着茎底部的高级根的发展，由于地面计数（通常称为“根领子”）获得的戒指计数（通常称为“根领子”）获得的黑云杉（Picea Mariana）的年龄不给予树木的真实时代。在成熟时，黑色云杉树的根系是完全不定的，这意味着初始根部不会随着时间而发展和消失。沿茎的根的发展有些“皮”，通过将生长环和根项圈掩盖到树桩木头和根部下方。由于森林动态的表征和生产力的估计主要在于树木的时代，而当年龄是错误的时候，这些估计也是错误的，并且可能导致经理的错误决定。例如，从地面上的环计数中出现的森林立场可能会比地面的圈数大得多，这会自动导致生产力高估和错误的管理决策。 该研究项目的主要目的是估计黑云杉在不同条件下生长的黑云杉的老化错误，使用这些估算来量化生产力高估并开发用于产量表和现场指数的校正工具。通过定位隐藏在黑云杉树桩内的发芽日期（真实年龄），我们将计算精确的年龄低估和相关的生产力高估。从基本层面上，我们希望确定有利于不定根的发展的条件，从而确定增加年龄低估的现场条件。从应用的水平上，与老龄化错误相关的生产力高估的数量将为经理提供更好的数据，以基于计划决策。