Vertical zonation and production rates of epiphytic algae on Phragmites australis
Vertical zonation and production rates of epiphytic algae on Phragmites australis
复制标题
芦苇附生藻类的垂直分带和生产率
DOI：
10.1111/j.1365-2427.1995.tb00424.x
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发表时间：
1995
影响因子：
2.7
通讯作者：
U. Müller
中科院分区：
文献类型：
--
作者：
U. Müller
总结
1.芦苇附生植物叶绿素的垂直分布在淹没部位的中段有一个峰值。就在水面以下和沉积物以上，叶绿素浓度要低得多。
2.在冬季和早春，松散附着的硅藻占主导地位的水面下和芦苇植物的中间部分。靠近底部的是大量的贴生硅藻、绿藻和蓝细菌的薄壁细胞体。
3.在高光合有效辐射（PAR）在5月，丝状物种Ulpthricophyceae和Zygophyceae发达的中间部分的茎密集的人口。
4.初级生产率是成比例的叶绿素浓度，虽然生产最大值记录以上的生物量最大值。
5.在低光照条件下，叶绿素比光合速率（PB率）下降成正比的PAR垂直下降的沿岸的区，独立的叶绿素浓度的茎。
6.在高光照条件下，光合速率随生物量的增加而降低，与地表辐射无关。
7.初级生产率对叶绿素浓度的依赖性产生了一条饱和曲线，最大生产量为4.6 μgC cm−2h−1。
SUMMARY
1. The vertical distribution of chlorophyll in epiphyton on Phragmites australis showed a peak in the middle sections of the submerged parts. Just below the water surface and above the sediment, chlorophyll concentrations were much less.
2. During winter and early spring, loosely attached diatoms were predominant just below the water surface and on the middle sections of the Phragmites plants. Near the bottom, adnate diatoms, parenchymatous thalli of chlorophytes and cyanobacteria were abundant.
3. At high photosynthetic active radiation (PAR) during May, filamentous species of Ulpthricophyceae and Zygophyceae developed dense populations on the middle sections of the stems.
4. Primary production rate was proportional to chlorophyll concentration although production maxima were recorded above the biomass maxima.
5. Where illumination was low, the chlorophyll-specific rate of photosynthesis (PB rate) decreased proportionally with the vertical decrease of PAR in the littoral zone, independent of the chlorophyll concentration on the stems.
6. When illumination was high, the PB rate decreased as biomass increased, and was independent of surface radiation.
7. The dependence of primary production rate on chlorophyll concentration produced a saturation curve with a maximum production at 4.6 μgC cm−2h−1.