黄龙风景区藻席嗜冷硅藻群落结构变化及其驱动因子分析  

Changes and driving factors of psychrophilic diatom community structure of algal mats in Huanglong Scenic Area

作　　者：饶瀚云 董发勤[2,3] 刘明学[1] 安德军[4] 代群威[3,5] 李琼芳[1] 张强[6] 刘轶凡 刘泽灵 张钰婷 RAO Hanyun;DONG Faqin;LIU Mingxue;AN Dejun;DAI Qunwei;LI Qiongfang;ZHANG Qiang;LIU Yifan;LIU Zeling;ZHANG Yuting(School of Life Science and Engineering,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Mianyang,Sichuan 621010,China;School of Environment and Resources,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Huanglong National Scenic Area Administration,Songpan,Sichuan 624000,China;Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Institute of Karst Geology,CAGS,Guilin,Guangxi 541004,China)

机构地区：[1]西南科技大学生命科学与工程学院,四川绵阳621010 [2]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010 [3]西南科技大学环境与资源学院,四川绵阳621010 [4]黄龙国家级风景名胜区管理局,四川松潘624000 [5]西南科技大学核废物与环境安全国防重点学科实验室,四川绵阳621010 [6]中国地质科学院岩溶地质研究所,广西桂林541004

出　　处：《中国岩溶》2023年第3期482-494,共13页Carsologica Sinica

基　　金：国家重点研发计划项目(2020YFE0203200);国家自然科学基金项目(U21A2016,41877288,41831285,51974261);自然资源部岩溶生态系统与石漠化治理重点实验室开放基金项目(YRSW2021634)。

摘　　要：硅藻群落对环境变化十分敏感,是自然河流水质变化的指示生物。为了解黄龙风景区藻席及藻席嗜冷硅藻群落结构与环境变量的关系,对景区内8个典型景点进行水样和藻席的采集并分析。结果表明,黄龙风景区藻席是以钙华作为基底,丝状藻作为骨架,栖息着大量硅藻的高寒岩溶微生态系统,共鉴定出25属72种硅藻,其中优势种13种,以桥弯藻属(Cymbella)为主。通过冗余分析发现,水温(F=2.8,P=0.02)和溶解硅(F=2.3,P=0.04)是影响黄龙风景区藻席嗜冷硅藻群落结构特征的主要驱动因子,TN是潜在驱动因子。硅藻可以为高寒岩溶区地表水监测提供重要的补充信息,建立完整的硅藻物种数据库,有利于区域水质监测。Huanglong Scenic Area,located in Songpan county,Sichuan Province,China,is listed as the World Natural Heritage,and is covered with travertine landscape at an altitude of about 3,145-3,588 m.With the plateau temperate sub-frigid monsoon climate,the melt water from snow mountains,the atmospheric precipitation and the underground karst water are the main water sources of Huanglong Scenic Area.In addition,covered by ice and snow at extremely low temperatures,Huanglong Scenic Area has a half-year-long freezing period with an annual average temperature of only 1.1℃.A large number of algae,mainly psychrophilic diatoms,grow in the water coverage of the travertine deposition area in the scenic area.The diatom community,an indicator of water quality change,is very sensitive to environmental changes in natural rivers.At present,there are still few studies related to this alpine karst area.In order to explore the structure of algal mats as well as the relationship between the community structure of psychrophilic diatoms in algal mats and environmental variables in Huanglong Scenic Area,we analyzed water samples and algae mats from 8 typical scenic spots in October 2021.The water temperature(T),pH and conductivity(Ec)as well as the concentrations of HCO_(3)^(-)and CO_(3)^(2-)of the sampling points were measured on site.At the same time,the geographic data of the sampling points were recorded.The concentrations of dissolved silicon(Dsi),cations(Ca^(2+),Mg^(2+),Al^(3+),K^(+)),anions(Cl^(−),NO_(3)^(-),SO_(4)^(2-)),TN and TP were determined in the laboratory.The structural compositions of the algal mats and the characteristics of the diatom community structure were analyzed.The main driving factors affecting the water of Huanglong Scenic Area were judged by Principal Component Analysis(PCA),and one of the two environmental variables with greater correlation was eliminated by Spearman Correlation Analysis.After Detrend Correspondence Analysis(DCA)of diatom species abundance in algal mats,Redundancy Analysis(RDA)was selected to

关 键 词：黄龙风景区 藻席 硅藻 群落结构 驱动因子 环境变量 

分 类 号：Q948[生物学—植物学]