辽东次生林典型林分三维绿量转换叶面积研究

项目名称： 辽东次生林典型林分三维绿量转换叶面积研究

项目编号： No.31270490

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 生物科学

项目作者： 刘常富

作者单位： 沈阳农业大学

项目金额： 87万元

中文摘要： 尺度转换是生态学研究的重要问题之一，叶面积指数(1eaf area index，LAI)精准估算是森林生态系统尺度转换和功能量化的关键。本研究拟以辽东次生林典型林分为研究对象，基于树冠内光异质性和树种光适应性对树冠进行分区，进一步借助计算机仿真技术，建立三维数字化树冠分区系统，在此基础上，提取分区树冠的三维绿量，野外活体实测树冠分区叶面积，通过简单累加和权重累加的方法获得单株、树种和冠层层次的三维绿量和叶面积，进而拟合树种和冠层两个层次三维绿量和叶面积的量化关系，解析叶面积和有效叶面积的转化关系，研究结果不仅能为实现森林叶面积指数和冠层功能高精度估算奠定理论基础，还能为应用激光雷达技术通过三维绿量大面积反演森林叶面积提供转换参数，为冠层分析系统测量叶面积指数提供校正系数，具有重要的科学意义和广阔的应用前景。

中文关键词： 尺度；叶面积指数；三维绿量；激光雷达技术；冠层

英文摘要： Scaling is one of the important scientific problems in ecology. Precision calculation of leaf area index (LAI) is the key for scaling and functional quantification of forest ecosystem. The study will take the typical stands of secondary forest in eastern Liaoning as research object. The tree canopy will be subarea based on light heterogeneity in tree canopy and light adaptation of tree species, and then establish a digital 3-dimensional subarea system of canopy with the aid of computer simulation technology. Canopy volume of subarea is extracted from the system and leaf area in the subarea is to be calculated by measuring living leaf one by one in the field. Canopy volume and leaf area of foliage, tree species and forest canopy will be obtained by adding and weighted adding. Quantification relationship between canopy volume and leaf area in tree species-level and canopy-level will be simulated. Conversion of leaf area to effective leaf area is analyzed and calculated. The results can be used to not only develop base for precision calculation of forest LAI and canopy functional quantification but also provide revised parameter of forest LAI in large forest area obtained by using Light Detection And Ranging(LiDAR) data and forest LAI obtained by plant canopy analysis system. It has the important scientific signifi

英文关键词： scale；leaf area index；canopy volume；LiDAR；canopy