Influence of substrate type on periphyton biomass and nutrient state at contrasting high nutrient levels in a subtropical shallow lake
Influence of substrate type on periphyton biomass and nutrient state at contrasting high nutrient levels in a subtropical shallow lake
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DOI：
10.1007/s10750-012-1287-6
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发表时间：
2013-06
期刊：
影响因子：
2.6
通讯作者：
N. Zhang;Hongjing Li;E. Jeppesen;Wei Li
中科院分区：
文献类型：
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作者：
N. Zhang;Hongjing Li;E. Jeppesen;Wei Li
基质如何影响附着生物的生物量和营养状态在不同的，但高，营养水平进行了测试，在三个大的围隔在一个超富营养化的亚热带浅水湖泊。我们比较了（1）在三种硬基质（石头，竹子和木材）上分别孵育2周和1年的周丛特性，以研究在过度营养水平下基质类型的影响的存在，以及（2）在人工植物上对比（parvopotamid样和myriophyllid样）软基质形态。在一般情况下，周丛生物量和营养状态是敏感的营养水平，培养时间，硬基板类型（除2周培养）和基板形态的变化，但在不同程度上。在大多数基质上，附着生物的养分含量随着营养水平的增加而增加。长时间培养的基质支持更多的周丛生物量，具有较高的营养含量和自养比例，但营养水平对营养含量的影响是独立的培养时间。硬基质类型对附着生物特征的影响远小于营养水平的影响。相比之下，软质基质形态对附着生物生物量和碳营养比的影响超过了营养水平。叶绿素，干物质，无灰干物质上parvopotamid比myriophyllid基板高得多。研究结果表明，即使在富营养化湖泊中，附着生物的生物量和营养状态也受到基质和营养水平的影响，这可能对底栖食物网产生级联效应。
How substrate affects periphyton biomass and nutrient state at different, but high, nutrient levels was tested in three large enclosures in a hypereutrophic subtropical shallow lake. We compared periphytic characteristics (1) on three hard substrates (stone, bamboo, and wood) incubated for 2 weeks and 1 year, respectively, to investigate the existence of the influences of substrate type at hypereutrophic levels, and (2) on artificial plants with contrasting (parvopotamid-like and myriophyllid-like) soft substrate morphology. In general, periphytic biomass and nutrient state were sensitive to variations in nutrient level, incubation time, hard substrate type (except 2-week incubated) and substrate morphology, but to a varying extent. The periphyton nutrient content increased with increasing nutrient levels on most substrates. Long-time incubated substrates supported more periphytic biomass, had a higher nutrient content and autotrophic proportion, while the effect of nutrient level on nutrient content in the periphyton was independent of incubation time. The effects of hard substrate type on periphyton characteristics were much weaker than those of nutrient level. By contrast, the effects of soft substrate morphology on periphyton biomass and carbon: nutrient ratios surpassed those of nutrient level. Chlorophylla, dry mass, and ash free dry mass were much higher on parvopotamid than on myriophyllid substrates. Our results show that periphyton biomass and nutrient state are influenced by both substrate and nutrient level even in hypereutrophic lakes, which might have cascading effects on the benthic food web.