雪宝顶流域黄龙彩池新生钙华生物沉积特性

为探究钙华沉积的生物特性，以雪宝顶流域黄龙景区的五彩池和争艳彩池为研究对象，采集和分析研究点藻类的优势种类，利用傅里叶变换红外光谱仪和高效液相色谱确定优势藻胞外产物的主要组成和含量，并采用X射线荧光光谱仪、X射线衍射光谱仪、傅里叶变换红外光谱仪和扫描电子显微镜分析其新生钙华的元素组成、物相结构和微观形貌。结果表明:五彩池和争艳彩池的优势藻类分别是黄藻门（Xanthophyceae）和硅藻门（Bacillariophyta），藻类的胞外产物主要为蛋白质、多糖和有机酸；新生钙华以方解石为主，表面含羧基、甲基、醛基等基团；与无藻类参与的钙华沉积物对比，新生钙华晶体无特定形状，并出现溶蚀及穿孔现象。藻类及其胞外产物参与钙华沉积过程，调控钙华晶体微观形貌。 

Study on Bio-deposition properties of newborn travertine in the Huanglong area of the Xuebaoding watershed

The purpose of this work was to explore the effect of algae on travertine deposition. Two typical color pools with different dominant algae，named Wucaichi and Zhengyancaichi，were selected for the research，which lie in the Huanglong scenic area of the Xuebaoding watershed. The dominant algae was collected and the main composition and content of its extracellular products were determined by Fourier transform infrared spectroscopy and high performance liquid chromatography. The elemental composition，phase structure and morphology of the new travertine were analyzed by a x-ray fluorescence spectrometer，x-ray diffraction spectrometer，Fourier transform infrared spectrometer and scanning electron microscope. The results show that the dominant algae in Wucaichi and Zhengyancaichi are Xanthophyceae and Bacillariophyta， respectively，and the extracellular products of the algae are mainly protein，polysaccharide and organic acid. New travertine is mainly calcite with carboxyl，methyl，aldehyde and other groups on the surface. Compared with the travertine sediment without algae，the new travertine crystal has no specific shape，and there are dissolution and perforation on the crystal. Research indicates that algae and their extracellular products participate in the process of travertine deposition and regulate the crystal morphology of travertine.