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.

应通过沿海拔梯度（海拔 2000 米和海拔 3000 米）的年内稳定碳同位素分析，研究施氮和氮肥对选定山地雨林树种内在水分利用效率的影响。年内同位素变化的时间分辨率约为两周，因此可以与电子树木仪记录的茎直径变化的高分辨率测量值以及通过木材解剖显微切片的图像分析测量的木材解剖特性的定量测量值进行比较。该研究将揭示施肥导致的特定物种水分利用效率的变化及其对短期干旱事件中树木生长反应和碳同位素分馏水平的影响。所选树种沿其海拔分布范围的定量木材解剖特征应阐明木质部潜在导水率是否对该树种的分布下限构成供水的潜在限制。