太子河流域硅藻群落与驱动因子的定量关系  

Quantitative Relationships among the Diatom Community and Driving Factors in Taizi River Basin,China

作　　者：闵文武[1,2] 韩洁[1] 王培培[1] 金文[1] 殷旭旺[1] 徐宗学[3] 张远[4] 

机构地区：[1]大连海洋大学水产与生命学院,辽宁省水生生物学重点实验室,辽宁大连116023 [2]贵州省水产研究所,贵州贵阳550025 [3]北京师范大学水科学研究院,北京100875 [4]中国环境科学研究院,环境基准与风险评估国家重点实验室,流域水生态保护技术研究室,北京100012

出　　处：《环境科学研究》2016年第5期672-679,共8页Research of Environmental Sciences

基　　金：国家自然科学基金项目(51279005);国家水体污染控制与治理科技重大专项(2012ZX07501-001);辽宁省优秀人才支持计划项目(LR2015009)

摘　　要：定量研究水生生物对水环境参数的适宜值是评估栖息地质量和维持生物完整性的主要途径.以辽宁省太子河流域为研究范例,选择Y（优势度指数）大于0.000 1的硅藻为研究对象,结合水环境参数,采用CCA（典范对应分析）、CART（分类回归树）和WA（加权平均回归分析）等方法,分析硅藻与水环境因子的关系,并计算硅藻对驱动因子的最适值.CCA结果表明,IOS（底质指数）、ρ（TDS）（TDS为总溶解固体）和ρ（CODMn）是硅藻群落的驱动因子;CART预测结果表明,IOS高的水环境硅藻密度高于IOS低的水环境,ρ（TDS）和ρ（CODMn）低的水环境硅藻密度高于ρ（TDS）和ρ（CODMn）高的水环境;WA结果显示,96种硅藻对IOS、ρ（TDS）和ρ（CODMn）的最适值范围分别为1.00-6.44、60.29-820.30 mg/L和0.46-2.89 mg/L.钝端菱形藻解剖刀变种和尖端菱形藻适宜栖息于IOS较低而ρ（CODMn）较高的水环境,Gomphonema trancatum和肿大桥弯藻则适宜栖息于IOS较高的水环境;缠结异极藻二叉变种和尖细异极藻适宜栖息于ρ（TDS）较高的水环境,弧形峨眉藻和克洛钝脆杆藻则适宜栖息于ρ（TDS）较低的水环境;弧形峨眉藻和隐头舟形藻威蓝变种适宜栖息于ρ（CODMn）较低的水环境.针杆藻和桥弯藻对IOS的最适值高于舟形藻和菱形藻以及其他藻种,96种硅藻对ρ（TDS）和ρ（CODMn）的最适值均表现为菱形藻和异极藻较高、针杆藻和桥弯藻较低.The relationship between aquatic organisms and environmental factors as determined by quantitative analysis is a common approach to assess habitat quality and maintain biological integrity. Diatoms are important tools in assessment of human impacts on stream water quality and ecological integrity. It is important to establish diatoms habitat suitability with environmental variables in water ecosystem health evaluation. The aim of this study was to clarify the quantitative relationship between diatom species assemblages and water environments of Taizi River Basin based on canonical correspondence analysis（ CCA）,classification and regression tree（ CART） and weighted average（ WA）. CCA showed that index of substrate（ IOS）,total dissolved solids（ TDS） and permanganate index（ CODMn） were highly correlated with the diatomassemblages. CART revealed that diatoms density from higher IOS was higher than that of lower IOS,and the diatom density from lower concentration of TDS and CODMnwas higher than that of higher concentration of TDS and CODMn. The WA indicated that the appropriate values for the 96 species of diatoms adapting to IOS,TDS and CODMnwere from 1. 00-6. 44,60. 29-820. 30 mg/L and 0. 46-2. 89 mg/L,respectively. Nitzschia obtusa var. Scalpelliformis,Nitzschia acula were mainly suitable for the lower IOS and higher concentration of CODMn; on the contrary,Gomphonema trancatum and Cymbella tumidula were mainly suitable for the high IOS. Gomphonema intricatum var. dichotomiformis and Gomphonema acuminatum were living with higher concentrations of TDS,while Ceratoneis arcus and Fragilaria crotonensis were living with lower concentrations of TDS. Ceratoneis arcus and Navicula cryptocephala var. venta mainly perched on the lower concentration of CODMn. The values of IOS for Synedra and Cymbella were higher than Navicula,Nitzschia and other diatom species. Furthermore,for Nitzschia and Gomphonema,the concentrations of TDS and CODMnwere higher than any others,which were lower for Synedra and Cymbel

关 键 词：硅藻 典范对应分析 加权平均回归分析 分类回归树 栖境最适值 太子河流域 

分 类 号：X171[环境科学与工程—环境科学]