由于其独特的钙华景观,黄龙风景区于1992年被联合国教科文组织列为世界自然遗产名录以来,每年吸引数以十万甚至百万计的国内外游客前来旅游；然而,可能由于旅游活动的影响,近年来黄龙钙华景观出现了诸多形式的退化,钙华沉积速率明显减缓即是其表现形式之一.为了阐明这一退化现象是否与旅游活动有关,从2010年5月下旬到11月初的丰水时段,采用野外采样和室内分析相结合的方法,对钙华沉积速率和溪流水中能对钙华沉积产生阻滞作用的磷酸盐、溶解有机碳浓度变化进行了研究.结果发现,随着景区游客人数的增减,水中磷酸盐、溶解有机碳浓度呈现出与之一致的变化趋势；同时,钙华沉积速率与磷酸盐、溶解有机碳间呈现出不同程度的负相关变化趋势,其中五彩池和迎宾池两处景点表现最为明显.因此,我们认为,旅游活动增加了黄龙景区溪流水中磷酸盐、溶解有机碳浓度,阻滞了钙华沉积,这很可能是黄龙钙华沉积速率近年来减缓的重要原因,值得引起有关方面的高度关注.%Huanglong, well known for its unique travertine landscape, was listed by UNESCO in 1992 as an entry in The World's Nature Heritage and, since then, has attracted tens of thousands of tourists from all over the world each year. Maybe due to the impact of tourist activities in recent years, Huanglong travertine landscape has shown serious degradations, one of which is the declined travertine deposition rate. To understand whether this degradation has relation with tourist activities or not, the authors used water sampling combined with laboratory analysis in the wet period of 2010 from late May to early November to study temporal variations in concentrations of phosphate and dissolved organic carbon (DOC) in stream water and in travertine deposition rate. The results indicated that, with the increase/decrease of tourist number, the concentrations of phosphate and DOC showed the same variation trend, and the negative correlation was found between travertine deposition rate and concentrations of phosphate and DOC, especially at Wucaichi and Yingbinchi sampling sites. Therefore, it is concluded that the tourist activities have affected concentrations of both the phosphate and DOC in Huanglong stream water, the latter inhibiting travertine deposition rate. This may be the main reason why the travertine deposition rate has declined in recent years.
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