Relationships between canopy surface structure and ecosystem function in a tropical rain forest using aerialphotograph analysis

目的和理由：1)在马来西亚沙捞越Lambir Hills国家公园的一块52公顷的LTER样地中，利用航空摄影获得5m网格范围内的森林冠层表面的数字高程数据，并对该样地进行分析。2)建立冠层高度剖面并进行动态位相分析。方法：利用52ha样地(500mx1040m)以上的航片进行了2.5m和5m格网数字高程的航空摄影、信号测量、地面控制点测量和采集。结果和讨论：52ha样地(5mx5m格子)的DEM数据显示了林冠表面的粗糙度，并与地形特征相吻合。在坡度较大的坡面上存在较大的林隙，而在坡背上分布着较小的林隙。提出了一种利用林冠盖度分析林窗光照状况的新方法，认为林窗内物种多样性不仅可以用林隙面积来评价，还可以用林冠开度来评价。

Purpose and Justification : 1) To get the digital elevation data for forest canopy surface in a mesh of 5m intervals for 52 ha LTER plot analyzed by using aerial photographs in a 52ha LTER plot, Mixed Dipterocarp forests, Lambir Hills National Park, Sarawak, Malaysia. 2) To construct a canopy height profile and analyze the dynamic phases. This will clarify more precise, local and regional estimates of dynamic phases based on forest canopy surface and can estimate stand biomass and carbon sequestration.Methods : Aerial photography, Signalization, Ground control Point Survey and Acquisition of 2.5m or 5m Grid Digital Elevations on canopy surface were conducted using aerophotographs above 52ha plot (500mxl040m).Results and Discussion : Canopy surface DEM data (5mx5m grid) in the 52ha plot showed the roughness of the canopy and coincidence with topographic characteristics. Large-scale gaps were located on the steep slopes on the dip slope, on the other hands, the smaller gaps distributed on the back slope, respectively. A new method for analyzing gap light condition using openness of canopy cover suggested species diversity in the canopy gap was evaluated not only by canopy gap area, but also by canopy openness.