草坪近地面光谱特征研究进展

摘要

The research and application progress in spectral reflectance characters of turf were reviewed.According to the reported studies both in domestic and abroad,the obvious phenomenon of ＂metamer＂ had been found among some cultivars of Festuca arundinacea,Lolium perenne and Poa pratensis.The sensitive bands and vegetation indices which were closely correlated with turf appearance quality,such as color,density,coverage and canopy chlorophyll level,had been selected and used to establish estimation models.Level of nitrogen can significantly change the spectral reflectance of the turf in both visible and near-infrared bands.Turf canopy reflectance changes resulted from water stress and diseases stress had been found and analyzed,and significant correlation between spectral character parameters and turfgrass physiological indices existed.Research on responses of turf canopy reflectance characters to environment stress should be emphasized in the future.%论述了草坪光谱反射特征的研究近况。国内外利用光谱分析技术在草坪领域开展了较为深入的研究,发现了高羊茅、多年生黑麦草、草地早熟禾的部分品种之间存在明显的＂同色异谱＂现象;筛选出与草坪外观质量指标显著相关的敏感波段和植被指数,建立了草坪色泽、密度、盖度及冠层叶绿素水平的光谱反演模型;氮肥水平能够明显改变草坪在可见光和近红外区的光谱反射率;在水分胁迫和病害胁迫条件下,草坪冠层反射光谱特征发生明显变化,植物生理学指标与光谱特征参数之间存在显著的相关性。对草坪在各种环境胁迫条件下的光谱响应机理的研究应加以重视。