ROW: Nutrient Uptake and Growth in Eastern Deciduous Tree Seedlings

ROW：东部落叶树幼苗的养分吸收和生长

• 批准号: 8706942
• 负责人: Kate Lajtha
• 金额: $ 1.05万
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-12-01 至 1989-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8706942&HistoricalAwards=false
• 关键词: ROW; Nutrient; Uptake; Growth; Eastern

This study will examine the relationship between ion absorption rate, relative growth rate, and the soil nutrient dependence of a suite of forest tree species that vary widely in both relative growth rate and canopy gap colonization ability. It is hypothesized that: 1) Gap colonizing species with high relative growth rates will have higher maximum ion absorption capacities than slowly growing species; 2) Shade tolerant species with low relative growth rates will have higher root absorption capacities at low nutrient concentrations than fast growing, gap colonizing species; 3) These differences will be greatest for soil mobile ions such as NO3 and K and less for soil immobile ions such as PO4 and NH4; 4) Nutrient uptake rates will be greater for seedlings acclimated to low nutrient conditions than to high nutrient conditions, and that this plasticity will be greater for species with high relative growth rates; 5) In the field, gap colonizing seedlings will be more responsive than slowly growing, shade tolerant species not only to increased light availability in gap sites but also to increased nutrient availability in fertilized sites. Six tree species of the eastern deciduous forest will be grown from seed. Three of these species represent gap colonizing species with high relative growth rates (Prunus serotina, Quercus coccinea, and Betula populifolia), and three represent shade tolerant species with low relative growth rates (Fraxinus americana, Carya ovata, and Quercus borealis). Three separate experiments will be performed to test the hypotheses.

本研究将研究离子吸收与 生长速率、相对生长速率和土壤养分依赖性 一组森林树种，在两个相对位置上变化很大 生长速率和林隙定殖能力。 是 假设： 1)具有高相对生长率的林隙定殖物种将 具有比缓慢生长的更高的最大离子吸收能力 种; 2)具有低相对生长率的耐荫物种将 在低养分条件下根系吸收能力强 浓度比快速增长，间隙殖民物种; 3)这些差异对于土壤移动的离子来说是最大的， NO3和K以及土壤固定离子（如PO 4和 NH4; 4)幼苗的养分吸收率会更高 适应低营养条件比适应高营养条件 条件，这种可塑性将更大， 相对增长率高的物种; 5)在田间，林隙定殖苗将更多 比生长缓慢，耐荫的物种不响应 不仅增加了GAP站点的光照可用性， 增加了施肥区的养分供应。 将种植东部落叶林的6个树种 从种子。 其中三个物种代表了间隙殖民 相对生长率高的树种有：樱桃、栎 coccalus和Betula populifolia），三个代表阴影 相对生长率低的耐受物种（白蜡属 美洲山核桃、卵果山核桃和北方栎）。 三个独立 将进行实验以检验假设。