摘要
试验以茶树不同炭疽病受害程度的叶片及健康叶片为材料,室内测定其光谱反射率。结果表明,炭疽病危害后,茶树叶片的光谱值随发病程度的增加表现出有规律的变化,740~1000 nm波段的光谱反射率随病情加重呈现下降趋势;而1370~2500 nm波段却表现出相反趋势。在742~974 nm和1374~2500 nm,炭疽病受害程度与光谱反射率呈极显著相关。对光谱一阶微分特征分析表明,在680~780 nm范围内处理间变幅最大,有2个波段的一阶微分值与受害程度表现出极显著相关性,分别为715~763 nm和776~778 nm波段。建立的炭疽病严重度诊断模型,均达到极显著水平,其中利用植被指数(Rg-Rr)/(Rg+Rr)建立的模型精确度最高。
The spectrum reflectance of single tea leaves infected by anthracnose was measured by ASD handy spec-troradiometer. The results indicated that the spectrum characteristics of tea leaves infected by anthracnose had regular change with the increase of disease severity. Spectrum reflectance decreased significantly in 740-1 000 nm with the increase of the disease severity,whereas it increased in range 1 370-2 500 nm . There were significant correlations between disease severity and the spectrum reflectance in 742-974 nm and 1 374-2 500 nm. The characteristics of first derivative spectra in the diseased leaves and healthy leaves were changed,especially in 680-780 nm. There were significant correlations between the disease severity and first derivative spectral reflectance in 715-763 nm and 776-778 nm. The models for estimating tea leaf disease severity of anthracnose all reached significant level. The model constructed using vegetation index(Rg-Rr )/(Rg+Rr )could accurately invert the tea leaf damage degree.
出处
《植物保护》
CAS
CSCD
北大核心
2014年第6期13-17,共5页
Plant Protection
基金
国家茶产业技术体系西部病虫害防控岗位专家基金(CARS-23)
重庆市公益性科研院所农发资金项目
关键词
茶树
炭疽病
受害程度
高光谱
诊断模型
tea
anthracnose
damage degree
spectrum characteristics
inversion model