DISSERTATION RESEARCH: Remote analysis of canopy gap dynamics and limiting similarity in a lowland Neotropical rain forest

论文研究：低地新热带雨林冠层间隙动态和限制相似性的远程分析

• 批准号: 0710211
• 负责人: Stephen Hubbell
• 金额: $ 0.99万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2008-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0710211&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Remote; analysis; canopy

A canopy gap is reduced vegetation height associated with the breakage or death of a canopy-forming tree. The distribution and dynamics of canopy gaps, and the processes responsible for their variation, have been the subject of long-term interest in forests, because gaps are associated with tree regeneration and the movement of chemicals through the forest. This project uses high spectral resolution remote sensing to measure variation in canopy nitrogen, and LiDAR remote sensing to quantify gap dynamics, to test hypotheses about tree species dynamics in the tropical rain forest at La Selva, Costa Rica. It will also examine variation in canopy gap dynamics using a nine-year LiDAR time series for a large tract of old-growth forest. By integrating hyperspectral analyses of nitrogen with LiDAR estimates of canopy height, the overall hypothesis can be tested that local variance in a key plant functional trait (nitrogen status) is a driver of tree mortality and gap dynamics across a landscape dominated by old-growth tropical rain forest.

林冠空隙是指与形成林冠的树木的断裂或死亡有关的植被高度降低。 林冠空隙的分布和动态以及造成其变化的过程一直是森林长期关注的主题，因为空隙与树木再生和化学品在森林中的移动有关。 该项目使用高光谱分辨率遥感测量冠层氮的变化，激光雷达遥感量化间隙动态，以测试关于哥斯达黎加拉塞尔瓦热带雨林树种动态的假设。 它还将研究林冠间隙动态的变化，使用九年的激光雷达时间序列的一大片古老的森林。 通过将氮的高光谱分析与LiDAR对冠层高度的估计相结合，可以检验整体假设，即关键植物功能性状（氮状态）的局部方差是以古老热带雨林为主的景观中树木死亡率和林隙动态的驱动因素。