摘要
[目的]揭示不同沙生灌木不同栽植年限根部和尼龙网格内表层的蓝藻生物量和群落结构特征,阐明蓝藻在不同沙生灌木根部和尼龙网格内表层的定殖情况。[方法]用显微镜计数法和体积换算法测得蓝藻的生物量;根据蓝藻种的形态、结构、大小等特点,利用《中国淡水藻类》、《中国淡水藻志》等参考书将其鉴定到种。[结果](1)3种沙生灌木不同栽植年限根部和尼龙网格内表层的生物量不同。1956年花棒根部的蓝藻个体数量最高(9.84×108个/g),而1981年花棒和1987年油蒿的最低(3.16×108个/g);1964年油蒿根部的蓝藻平均总体积最大(1.04×1013μm3/g),而1964年柠条的最低(6.00×1011μm3/g);1987年油蒿根部的丝状蓝藻百分比最高(98.4%),而尼龙网格内表层的最低(38.75%);(2)3种沙生灌木不同栽植年限根部和尼龙网格内表层的群落结构不同。共分离出25种蓝藻,属于色球藻目、颤藻目和念珠藻目。其中,巨颤藻最常见,且分离出点型念珠藻、嫩柔微毛藻和线形眉藻3种固氮蓝藻。[结论]3种沙生灌木根部的蓝藻生物量高,种类丰富,说明这3种沙生灌木根部是蓝藻定殖与繁衍的有利场所。
[Objective]This study aimed to reveal cyanobacterial biomass and community structure within shielding nylon mesh in different shrub roots with different plantation ages and within shielding nylon mesh,and to clarify the colonized states of cyanobacteria in different shrub roots and within nylon mesh.[Methods]Biomass of cyanobacteria were measured by counting and volume conversion with microscope and these cyanobacteria were identified according to their morphology,structure,size and other characteristics with toxomony book ＂freshwater algae of China＂and so on.[Results]Number of cyanobacteria was as the highest as 9.84×108 cell/g in the root of Hedysarumscoparium which was planted in 1956,and were the lowest（3.16×108 cells/g）in the root of Hedysarum scoparium planted in 1981 and in the root of Artemisia ordosic planted in 1987.Average total volume of cyanobacteria was the highest（1.04×1013μm3/g）in the root of Artemisiaordosicplanted in 1964,and the lowest（6.00×1011μm3/g）in the root of Carnageintermedia planted in 1964.The percentage of filamentous cyanobacteria was the highest（98.4%）in the root of Artemisia ordosicplanted in 1987,and the lowest（38.75%）within nylon mesh.Totally 25 cyanobacteria,mainly belonging to Chroococcales,Oscillatoriales and Nostocales,were found.Among them,Oscillatoria princepsis the most dominant cyanobacteria,and Nostoc punctiforme,Microchatetenera thuret and Calothrix linearis were recognized.[Conclusion]Cyanobacterial biomass and their diversity of three kinds of shrub roots were found higher,probably their rhizosphere habitats are favorable for cyanobacterial colonization and reproduction.
出处
《水土保持通报》
CSCD
2017年第6期75-79,共5页
Bulletin of Soil and Water Conservation
基金
青海黄河上游水电开发有限责任公司"光伏产业带动生态建设试点项目"(90Y490B21)
关键词
沙生灌木
蓝藻
生物量
群落结构
沙坡头
desert shrub
cyanobacteria
biomass
community structure
Shapotou area
