Calcium and aluminum impacts on sugar maple physiology in a northern hardwood forest.
Calcium and aluminum impacts on sugar maple physiology in a northern hardwood forest.
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钙和铝对北部阔叶林糖枫生理的影响。
DOI：
10.1093/treephys/tpt099
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发表时间：
2013
期刊：
影响因子：
4
通讯作者：
T. Fahey
中科院分区：
文献类型：
--
作者：
Joshua M Halman;P. Schaberg;G. Hawley;L. Pardo;T. Fahey
北美东北部的森林已暴露于人为酸性输入几十年，导致阳离子关系的改变和干扰相关的生理过程中的多个树种，包括糖枫（槭糖沼泽。在目前的研究中，钙（Ca）和铝（Al）添加对成熟的糖枫生理的影响进行了评估，在哈伯德布鲁克实验森林（桑顿，NH，美国），以评估补救（Ca添加）或恶化（Al添加）目前的酸化条件。细根阳离子浓度和膜的完整性，碳（C）分配，叶片阳离子浓度和抗氧化活性，叶片响应春季冻结事件和繁殖能力（开花，种子数量，填充种子和种子发芽）进行了评估占主导地位的糖枫树在重复的小区研究。根损伤和叶片抗氧化活性最高的铝处理的树木，而生长相关的C，叶面再冲洗后，春季霜冻和繁殖能力最高的钙处理的树木。在一般情况下，我们发现，树木钙处理地块优先使用C资源的生长和繁殖过程，而铝处理的树木致力于C防御为基础的过程。铝处理和对照树之间的相似性进行了观察，叶面阳离子浓度，C分区和种子生产，这表明糖枫树生长在原生林可能比以前认为的压力。我们的实验表明，酸沉积破坏糖枫树中钙和铝的平衡仍然是树木健康的重要驱动力。
Forests of northeastern North America have been exposed to anthropogenic acidic inputs for decades, resulting in altered cation relations and disruptions to associated physiological processes in multiple tree species, including sugar maple (Acer saccharum Marsh.). In the current study, the impacts of calcium (Ca) and aluminum (Al) additions on mature sugar maple physiology were evaluated at the Hubbard Brook Experimental Forest (Thornton, NH, USA) to assess remediation (Ca addition) or exacerbation (Al addition) of current acidified conditions. Fine root cation concentrations and membrane integrity, carbon (C) allocation, foliar cation concentrations and antioxidant activity, foliar response to a spring freezing event and reproductive ability (flowering, seed quantity, filled seed and seed germination) were evaluated for dominant sugar maple trees in a replicated plot study. Root damage and foliar antioxidant activity were highest in Al-treated trees, while growth-associated C, foliar re-flush following a spring frost and reproductive ability were highest in Ca-treated trees. In general, we found that trees on Ca-treated plots preferentially used C resources for growth and reproductive processes, whereas Al-treated trees devoted C to defense-based processes. Similarities between Al-treated and control trees were observed for foliar cation concentrations, C partitioning and seed production, suggesting that sugar maples growing in native forests may be more stressed than previously perceived. Our experiment suggests that disruption of the balance of Ca and Al in sugar maples by acid deposition continues to be an important driver of tree health.