应用生态学报2017，Vol.28Issue(3)：757-762,6.DOI:10.13287/j.1001-9332.201703.011
大兴安岭地区主要植被类型的叶片聚集度系数
Foliage clumping index of main vegetation types in Daxing'an Mountains, Northeast China
摘要
Abstract
The foliage clumping index quantifies the cluster degree of the leaf spatial distribution under random canopy.It is of comparable importance for establishment of ecological models.MODIS BRDF model parameter products (MCD43A1 data) and land cover types (MCD12Q1 data) were used in this study to simulate the reflectivity of the hot spots and dark spots,and calculate the normalized difference between hotspot and darkspot (NDHD) based on the Ross-Li semi-empirical model.Least square method was then used to simulate the relationship between NDHD and the foliage clumping index and foliage clumping index products of 500-m resolution in August 2014 were retrieved.Measurements of the foliage clumping index in Daxing'an Mountains were conducted by using the TRAC (Tracing Radiation and Architecture of Canopies) sampling instrument for model validation and analysis.Results showed that it was a feasible algorithm to retrieve clumping index from MCD43A1 product with the correlation of simulated data and the measured data of significance (R2=0.8879).The MODIS near infrared wave band was more sensitive than that on red band to foliage clumping index change.With the increase of the solar zenith angle,the clumping index retrieved by Ross-Li model had a linear increase (R2=0.9699),which indicated that the foliage clumping index related to the solar zenith angle.关键词
聚集度系数/MODIS BRDF/Ross-Li模型Key words
clumping index/MODIS BRDF/Ross-Li model引用本文复制引用
黄婷,范文义,毛学刚,于颖..大兴安岭地区主要植被类型的叶片聚集度系数[J].应用生态学报,2017,28(3):757-762,6.基金项目
本文由国家自然科学基金项目(31300533)资助 This work was supported by the National Natural Science Foundation of China (31300533). （31300533）
