网络上流传九寨沟湖水因人工染色才呈现蓝色的说法。对此，九寨沟景区管理局发布严正辟谣声明，澄清这一说法纯属谣言[1]。
九寨沟风景名胜区管理局副局长文义勇表示，作为国家级自然保护区、世界自然遗产地，景区全年常态化开展水体和钙华生态监测[1]。中国科学院成都生物研究所研究员孙庚指出，九寨沟湖水中含有大量钙、镁、碳酸根离子，这些离子形成0.1至0.45微米的钙华颗粒，通过反射散射蓝绿光而呈现出湖泊的蓝绿色[1]。此外，九寨沟属于贫营养湖泊，水质良好，这也是湖泊呈现蓝色的重要原因[1]。
Circulating online claims that Jiuzhaigou's iconic blue waters result from artificial dye have been firmly denied by authorities. [1] The Jiuzhaigou Scenic Area Management Bureau released an official statement clarifying that such allegations are entirely false and unfounded. [1]
Scientific experts have provided detailed explanations for the lake's striking coloration. Sun Geng, a researcher at the Chengdu Institute of Biology under the Chinese Academy of Sciences, explained that the water contains substantial concentrations of calcium, magnesium, and carbonate ions, which form calcium carbonate particles measuring 0.1 to 0.45 micrometers. [1] These particles naturally reflect and scatter short-wavelength blue and green light, creating the distinctive hue without any artificial intervention. [1] Additionally, Jiuzhaigou functions as an oligotrophic (nutrient-poor) lake with excellent water quality, a characteristic that significantly contributes to the blue appearance of its waters. [1]
Wen Yiyong, deputy director of the Jiuzhaigou National Scenic Area and National Nature Reserve Management Bureau, emphasized that as a national-level nature reserve and UNESCO World Natural Heritage site, the region conducts year-round routine monitoring of water bodies and travertine ecosystems. [1] This ongoing ecological surveillance underscores the authentic and natural composition of the lake environment.