海水酸化造成全球珊瑚礁严重退化, 应用卫星遥感手段可以快速地对珊瑚礁进行监测。在野外做酸度对比实验具有条件不易控制、周期长等局限性。文章提出一种室内测量珊瑚光谱的方法, 通过比较不同酸度梯度下珊瑚光谱的变化, 为研究海水酸化对珊瑚的影响提供了一种新的思路。试验采用7.6、7.9和8.1的酸度梯度, 结果表明: 在pH为8.1和7.9环境条件下, 珊瑚的光谱趋势大体一致, 总体上珊瑚光谱波峰出现了向长波方向的红移。但是在pH为7.6的条件下, 珊瑚的光谱在650~700nm之间出现一个反常的吸收谷, 这是由于pH 7.6的酸度条件适宜一些藻类生长, 藻类附着在珊瑚表面, 从而影响了其光谱特性。
The global coral reefs are severely degraded by ocean acidification in recent years and satellite remote sensing can monitor coral reefs’ degradation timely. Due to the limitation of conducting acidification comparative experiments in the field, this paper proposes a method of measuring coral reef spectrum in the laboratory, which provides a new way for analyzing the influence of acidification on coral reefs by comparing the coral spectrum under different pH conditions. The experiments adopt three different acidities of 7.6, 7.9 and 8.1. And the results show the spectra of coral reefs have similar spectral shapes in general when the pH values are 8.1 and 7.9. When the pH is 7.9, the coral spectrum peak appears to move into the direction of long a wavelength. But when the pH is 7.6, there is an abnormal absorption valley between 650~700 nm in the coral spectrum, caused by the absorption of some algae. The results show that pH of 7.6 is a suitable acidity for the growth of some algae that can attach to the surface of coral reefs and affect the spectral properties of coral reefs.
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