摘要
以毛竹光谱特征为研究对象,通过对光谱曲线和一阶导数曲线进行分析,探明了不同季节毛竹林的光谱特征及其与典型树种的光谱差异,为毛竹林的遥感监测提供了理论依据。研究结果表明:1)毛竹光谱曲线在可见光波段出现1个反射峰和1个吸收谷,这2个峰的对应波长分别为556和680nm,近红外波段的反射率明显增大。2)大年毛竹林春季和夏季的一阶导数曲线的红边波段呈"双峰",秋季和冬季呈"单峰",夏季的红边位于700nm,其他季节红边位于718nm;小年毛竹林秋季的一阶导数曲线的红边波段呈"双峰",冬季呈"单峰",红边均位于718nm;不同季节毛竹林红边振幅大小依次为:春季>夏季>冬季>秋季。3)毛竹林与其他典型植被在500～600、660～680、700～900nm等波段的反射率差异明显,可作为遥感监测的最佳波段,并且"绿峰"、"红谷"、红边位置、红边振幅以及红边波段的"峰型"等特征可作为毛竹林遥感识别的主要参数,监测最佳季节是春季,其次为秋季。
The spectral characteristics of bamboo in different seasons were investigated and compared with typical vegetation by analyzing the spectral curve and first derivative curve, which provided the theoretical basis for remote sensing monitoring. The results showed that： 1 ） a reflection peak and an absorption valley were observed in the bamboo spectral curve at the visible band, and the corresponding wavelengths of these peaks were 556 and 680 mm, respectively. Moreover, the reflectance at the near-infrared band was significantly increased. 2） The characteristics of first derivative curve for on and off year bamboo were different, the peaks of on-year bamboo at the red edge band in spring and summer presented ＂two humps＂, and the peaks presented ＂single peak＂ in autumn and winter, the red edge located at 700 nm in summer and appeared at 718 nm in spring, autumn and winter; however, the peaks of off-year bamboo at the red edge band in autumn presented ＂ two humps＂, and the peaks presented ＂ single peak＂ in winter, the peaks all located at 718 nm in four seasons; the red edge amplitude of bamboo in different seasons was in the order of spring 〉 summer 〉 winter 〉 autumn. 3 ） The difference of reflectivity at 500- 600, 660-680 and 700-900 nm between the bamboo and other typical vegetations was obvious, so the bands were the best for remote sensing. Moreover, these characteristics, such as ＂ green peak＂, ＂red valley＂, position of red edge, amplitude of red edge and the peak type at red edge band, can be taken as main parameters for remote sensing identification of bamboo, and the best season for monitoring is spring, followed by autumn.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2012年第3期31-35,共5页
Journal of Beijing Forestry University
基金
"十二五"国家科技支撑计划项目(2012BAD23B04)
林业科技成果推广项目"竹资源遥感监测及信息化管理技术示范推广"
江西省财政林业重大专项(2011511101)
林业公益性行业科研专项(200904047)
"948"国家林业局引进项目(2006-04-25)
国际竹藤中心基本科研业务专项资金(1632010012)
关键词
毛竹
光谱特征
红边参数
Phyllostachys pubescens
spectral characteristics
red edge parameter
