Production and Resource Use Efficiency of Larch and Sympatric Evergreen Conifers

落叶松和同域常绿针叶树的生产和资源利用效率

• 批准号: 9107419
• 负责人: Stith Gower
• 金额: $ 20.92万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9107419&HistoricalAwards=false
• 关键词: Production; Resource; Use; Efficiency; Larch

Larix, a deciduous conifer, is abundant in high montane, subalpine, and boreal forests throughout the Northern Hemisphere. The widespread importance of larch in cold-temperate montane and boreal forests and its similar canopy architecture needle morphology and water conducting system to evergreen conifers makes larch an ideal species to elucidate the influence of leaf habit (e.g., evergreen vs. deciduous) on carbon balance and nutrient use. The principal investigators propose to contrast the carbon and nutrient use of Larix occidentals and Pinus contorta in high montane forests in Montana and Larix laricina and Picea mariana in boreal forests in Wisconsin. The major hypotheses are: (1) aboveground net primary production is equal or greater for larch than sympatric evergreen conifers, (2) total (above-and belowground) net primary production is similar for larch and sympatric evergreen conifers because (3) belowground net primary production in larch is less than in evergreen conifers. Lastly, they speculate (4) larch uses nitrogen more efficiently (leaf, canopy, and stand-level) than evergreen conifers. These hypotheses lead to several corollary hypotheses predicting the role of physiological and architectural traits that enable larch to successfully complete with evergreen conifers.

落叶松是一种落叶针叶树，广泛存在于整个北半球的高山、亚高山和北方森林中。 落叶松在冷温带山地和北方森林中的广泛重要性及其与常绿针叶树相似的冠层结构针形态和导水系统使落叶松成为阐明叶子习性（例如常绿与落叶）对碳平衡影响的理想物种和营养物质的利用。 主要研究人员提议对比蒙大拿州高山森林中的西落叶松和松树以及威斯康星州北方森林中的落叶松和云杉的碳和养分利用情况。 主要假设是：（1）落叶松的地上净初级生产力等于或大于同域常绿针叶树，（2）落叶松和同域常绿针叶树的总（地上和地下）净初级生产力相似，因为（3）地下净初级生产力落叶松的初级生产力低于常绿针叶树。 最后，他们推测 (4) 落叶松比常绿针叶树更有效地利用氮（叶子、树冠和林分水平）。 这些假设引出了几个推论假设，这些假设预测了落叶松能够成功地与常绿针叶树完成生理和结构特征的作用。