Apportionment study of calcium nutrition of boreal tree species

寒带树种钙营养分配研究

• 批准号: 312369-2010
• 负责人: Bélanger, Nicolas
• 金额: $ 1.46万
• 依托单位: Université du Québec à Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=457385
• 关键词: Apportionment; study; calcium; nutrition; boreal

The goal of this research is to assess the role of calcium (Ca) nutrition on tree growth in boreal forests. Intense forest harvesting practices may favor increased exports of Ca from the ecosystem to a point that Ca may become limiting to trees before nitrogen. Increased air pollution with a concomitant increase in rain acidity and leaching of Ca will only exacerbate its export. It has therefore been suggested that foliar Ca deficiencies and subsequent health problems/growth declines will occur in air polluted and/or commercial boreal forests if Ca exports are in excess of those added naturally or by fertilization. These forests grow on coarse-textured acidic soils that slowly release Ca from soil mineral weathering and thus, the paradigm that the Ca in trees are those mobilized into the soil solution from weathering is being challenged by studies showing that contributions of atmospherically derived Ca to the trees in some ecosystems is very large and that the trees are almost fully decoupled from Ca coming from deeper soil sources. The next five years will therefore aim at determining the capacity of Canadian and Scandinavian boreal tree species with different functional traits to promote soil mineral weathering and make use of the released Ca when availability is low and/or being intensely competed for (deficient). The applicant's plan is to investigate Ca nutrition by using alkali earth element ratios and strontium isotopes as tracers. Tree species will be studied in growth chambers and in the field along gradients of soil fertility, plant competition, and productivity. The results will then be used to find the best indicators of Ca supply and tree growth and implement them in landscape productivity models with permanent site variables (e.g., climate and drainage) and nitrogen as driver variables. These indicators are important from a forest management perspective as they will allow scientists and forest managers to better forecast growth rates of forest stands and therefore, make better planning of forest utilization. In the long term, this research will help identify if some stands are sensitive to exports in Ca and whether the integrity of these forests is jeopardized by harvesting.

这项研究的目的是评估钙（CA）营养对北方森林中树木生长的作用。强烈的森林收获实践可能有利于从生态系统到CA在氮之前限制树木的CA出口增加。空气污染的增加，随之而来的雨酸性和CA的浸出只会加剧其出口。因此，有人提出，如果CA出口超过自然或受精的叶面，则在污染的空气和/或商业北方森林中，在污染的空气和/或商业北方森林中，叶面CA缺乏症和随后的健康问题/生长下降将发生。这些森林在粗纹理的酸性土壤上生长，从土壤矿物质耐磨的ca慢慢释放出Ca，因此，树木中的ca是动员到土壤溶液中的范式，这是通过研究的挑战，表明，大气在某些生态系统中对CA对树木的贡献的贡献非常大，并且几乎完全是从Ca ca of ca for ca for ca for ca for ca的源泉。因此，接下来的五年将旨在确定具有不同功能性状的加拿大和斯堪的纳维亚北极树种的能力，以促进土壤矿物风化，并在可用性低和/或激烈竞争（不足）时使用释放的CA。申请人的计划是通过使用碱接地元素比率和锶同位素作为示踪剂来研究CA营养。将在生长室和田间研究树种，沿土壤生育能力，植物竞争和生产力的梯度进行研究。然后，结果将用于找到CA供应和树木生长的最佳指标，并在具有永久位点变量（例如气候和排水）和氮作为驱动器变量的景观生产力模型中实现它们。从森林管理的角度来看，这些指标很重要，因为它们将允许科学家和森林经理更好地预测森林立场的增长速度，因此可以更好地计划森林利用。从长远来看，这项研究将有助于确定某些立场是否对CA中的出口敏感，以及这些森林的完整性是否因收获而危害。