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

目的与理由：1)利用马来西亚兰比山国家公园混合龙脑林52ha LTER样地的航拍影像，获得52ha LTER样地5m间隔的数字高程数据。2)构建冠层高度剖面图并分析动态阶段。这将澄清基于森林冠层表面的更精确的局部和区域动态阶段估计，并可以估计林分生物量和碳固存。方法：采用52ha地块（500mx1040m）以上的航拍照片，进行航拍、信号、地面控制点测量和获取冠层表面2.5m或5m网格数字高程。结果与讨论：52ha样地的冠层表面DEM数据（5mx5m网格）显示了冠层的粗糙度，且与地形特征吻合。大尺度的林隙分布在陡坡上，小尺度的林隙分布在后坡上。利用冠层开度分析林隙光照条件的新方法表明，林隙内的物种多样性不仅可以通过林隙面积来评价，还可以通过冠层开度来评价。

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.