Tree growth and wood anatomy along elevational and nutritional gradients in tropical forests in southern Ecuador

厄瓜多尔南部热带森林沿海拔和营养梯度的树木生长和木材解剖学

• 批准号: 36003657
• 负责人: Professor Dr. Achim Bräuning
• 金额: --
• 依托单位: Institut für Geographie
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/36003657?language=en
• 关键词: Tree; growth; wood; anatomy; along

The impact of N and NP fertilization on the intrinsic water use efficiency on selected mountain rainforest tree species shall be studied by means of intra-annual stable carbon isotope analyses along an altitudinal gradient (2000 m asl. and 3000 m asl.). The temporal resolution of the intra-annual isotope variations is about two weeks and thus can be compared to high-resolution measurements of stem diameter variations registered with electronic dendrometers and to quantitative measurements of wood anatomical properties measured by image analyses of wood anatomical microsections. The study will reveal species-specific changes of water use efficiency due to fertilization and its effect on tree growth responses and carbon isotope fractionation levels on short-term drought events. Quantitative wood anatomical characterization of selected tree species along its altitudinal distribution range shall clarify if xylem potential water conductivity poses a potential limit of water supply at the lower distribution limit of the species.

N和NP受精对固有用水效率对选定的山林雨林树种的影响应通过沿着高度梯度（2000 m ASL。和3000 m ASL。）的年度稳定碳同位素分析来研究。青年同位素变化的时间分辨率约为两周，因此可以将其与用电子树枝状仪注册的茎直径变化的高分辨率测量和通过图像分析木材解剖学微观分析测量的木材解剖学特性进行定量测量。该研究将揭示由于受精及其对树木生长反应和碳同位素分馏水平在短期干旱事件上的影响以及其对树木生长反应和碳同位素分馏水平的影响。选定树种沿其高度分布范围的定量木材解剖表征应阐明木质部电势是否在该物种的较低分布极限处构成潜在的供水限制。