权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Wide Range Measurement of Surface Vegetation as Global Environment Asset and Development of Its Function Evaluation System

全球环境资产地表植被的大范围测量及其功能评价体系的开发

基本信息

批准号：
08306007
负责人：
SWEDA Tatsuo
金额：
$ 11.78万
依托单位：
Ehime University (1997-1998)Nagoya University (1996)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

Entirely new methods of estimating forest biomass and leaf area index (LAI) over an extensive area from vegetation profile obtained by airborne laser altimetry were developed, and a laser-based GIS forest inventory system was established to accommodate such environment-oriented information along with the existing timber-oriented information and data.The vegetation profile data, which constitutes the basis of the research, was obtained by a flight over the Mt. Ontakesan in the present project, as well as from other sources for the Experimental Forest of Ehime University and for a 600km long transect over the boreal forest of Canada. Also a series of forest inventory surveys was conducted to obtain ground truth for existing forest biomass and LAI. Based on these remotely sensed and ground data, three different methods of deducing forest biomass and LAI from the vegetation profile were developed. The first method is based on the Fourier analysis of the profile, which yields power spectrum, which further in turn gives the mean canopy diameter as the wavelength corresponding to the power maxima. Other important stand characteristics such as mean DBH, tree height and stern density are then derived from the mean canopy diameter, eventually leading to estimates of stand stocking and biomass. The second method is based on the notion of the mean free path in molecular kinetics and gives an estimate of leaf density as a function of the mean laser penetration depth into the foliage, which along with the mean area of a single leaf, results in an estimate of entire leaf area of the canopy anti thus the LAI. The last method correlates the integration of the vegetation profile with stand stocking, which is well represented by the product of mean tree height and stem density.

提出了利用机载激光测高获得的植被剖面数据估算大面积森林生物量和叶面积指数的新方法，并建立了基于激光的GIS森林资源调查系统，该系统沿着了现有的森林资源信息和数据。植被剖面数据是研究的基础，是通过飞越Mt. Ontakesan在本项目中，以及其他来源的爱媛大学实验森林和加拿大北部森林600公里长的样带。还进行了一系列森林清查调查，以获得现有森林生物量和叶面积指数的地面实况。基于这些遥感和地面数据，三种不同的方法推导森林生物量和叶面积指数从植被剖面。第一种方法是基于傅立叶分析的轮廓，产生功率谱，进而给出平均冠层直径作为波长对应的功率最大值。其他重要的林分特征，如平均胸径，树高和船尾密度，然后从平均冠层直径，最终导致林分蓄积量和生物量的估计。第二种方法是基于分子动力学中的平均自由程的概念，并给出了叶密度的估计，作为平均激光穿透深度的函数，其中沿着与单个叶的平均面积，导致在冠层的整个叶面积的估计，从而叶面积指数。最后一种方法将植被剖面与林分蓄积量的整合相关联，这很好地表示为平均树高和树干密度的乘积。