生态学报2017，Vol.37Issue(8)：2818-2827,10.DOI:10.5846/stxb201603100424
扎龙湿地硅藻植物群落季节变化及其对环境的响应
Seasonal changes of diatom community structure in the Zhalong wetland and its relationship with environmental conditions
摘要
Abstract
The Zhalong wetland is located in the western portion of the Heilongjiang Province,downstream of the Wuyuer River,which is the most complete wetland in north China at similar latitudes.It is an important habitat for cherish cranes and waterfowl.Recently,water in the Zhalong wetland became more saline.In 2012,algae samples were collected from six sites in spring,summer,and autumn.In total,140 diatom taxa were observed,including 121 species,19 varieties belonging to 2 classes,6 orders,9 families,and 30 genera.Pennatae diatoms were rich in species and accounted for 95％ of the total number.Diatom community showed seasonal succession,with the richness and relative abundance of diatom species in autumn higher than during spring and summer.Most of the dominant species were freshwater,brackish,or weakly alkaline water species.Dominant species occurred in response to salinity and pH of water;an obvious correlation with environmental conditions.Navicula cryptocephala was the dominant species of the Zhalong wetland in spring,summer,and autumn.Meanwhile,Amphipleura pellucida,Gomphonema micropus,and Nitzschia palea were abundant in alkaline water.This indicated that the Zhalong wetland was affected by soil salinization.Environmental parameters,including pH,water temperature (WT),conductivity (SpCond.),chemical oxygen demand (CODCr),permanganate index (CODMn),biochemical oxygen demand (BOD5),dissolved oxygen (DO),total phosphorus (TP),and total nitrogen (TN) were measured.The relationships between environmental factors and the variation in diatom community structure were analyzed by canonical correspondence analysis(CCA).CCA showed that water temperature,conductivity,pH,and DO were the most important factors influencing the structure of diatom communities.TN and TP were also important driving factors of the seasonal succession of diatom communities.Combining the diversity index and diatom quotient,the Shannon Wiener diversity index ranged from 2.70 to 5.65;Simpson dominance index ranged from 0.67 to 0.97;Pielou evenness index was between 0.43 and 0.91,and Diatom Quotient ranged from 0.007 to 0.11.The water in the Zhalong wetland was mesosaprobic-oligosaprobic;Some parts of the water were clear,but a few parts were slightly polluted by humans.关键词
硅藻群落/季节变化/环境响应Key words
diatom community structure/seasonal changes/environmental condition引用本文复制引用
代存芳,易映彤,刘妍,巴秋爽,范亚文..扎龙湿地硅藻植物群落季节变化及其对环境的响应[J].生态学报,2017,37(8):2818-2827,10.基金项目
国家自然科学基金资助(31270250,31470308) （31270250,31470308）
