南海三亚湾鹿回头海域风信子鹿角珊瑚反射率分析

摘要

An application of remote sensing in monitoring and management of coral was developed with reflectance identification of coral substrate. Some foreign scholars have discriminated reflectance of coral substrate, while the reflectance of different coral substrate discrimination in the South China Sea did not exist. This study explored reflectance of Acropora hyacinthus at Luhuitou Sanya using spectrum instrument. Healthy Acropora hyacinthus exhibited positive reflectance features at 570, 600 and 650 nm. Reflectance by dead Acropora hyacinthus was obviously higher than that by healthy Acropora hyacinthus, and did not jave positive reflectance features. The differential analysis of coral substrate reflectance use PRIMER6 software packages Clustering. Healthy Acropora hyacinthus reflectance, dead Acropora hyacinthus reflectance and sand reflectance can be distinguished at the level of 80% Bray-Curits similarity. Based on reflectance derivative analysis, the first derivative of reflectance between 490 and 560 nm provided good identification of healthy and dead Acropora hyacinthus.%珊瑚礁反射率特征识别工作的开展，将促进遥感技术在珊瑚礁监测与管理中的应用。国外已有学者对特定区域不同珊瑚礁底质反射率进行识别分类，而我国珊瑚礁反射率特征研究尚未见诸报道，亟须相关研究来弥补这一空白。文章以南海三亚湾鹿回头海域常见风信子鹿角珊瑚Acropora hyacinthus为主要研究对象，利用光谱仪测量其反射率。分析发现健康风信子鹿角珊瑚反射率在575、605、650nm 处出现特征波峰；死亡风信子鹿角珊瑚反射率明显高于健康风信子鹿角珊瑚反射率。利用大型多元统计软件PRIMER 6对健康风信子鹿角珊瑚、死亡风信子鹿角珊瑚、珊瑚礁底砂进行 Bray-Curtis 相似聚类(CLUSTER)分析，结果显示，在80%相似水平上可以对其进行区分。一阶导数分析表明健康与死亡风信子鹿角珊瑚敏感波段为490~560nm。