Relations between trophic state indicators and plant biomass in Florida lakes
Relations between trophic state indicators and plant biomass in Florida lakes
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DOI：
10.1023/a:1015660922494
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发表时间：
2002-02-01
期刊：
影响因子：
2.6
通讯作者：
Canfield, DE
中科院分区：
文献类型：
--
作者：
Bachmann, RW;Horsburgh, CA;Canfield, DE
我们收集了319个主要是浅，复混，佛罗里达湖泊的水生植物丰度和水质的定量数据，寻找营养状态指标和浮游藻类，附生生物和水生植物的生物量之间的关系。这些湖泊从贫营养到富营养，藻类叶绿素总量从1到241毫克米（-3）不等。浮游植物叶绿素含量与总磷、总氮呈极强的正相关，而附着生物密度与总磷、总氮、藻类叶绿素呈弱的负相关，与Secchi深度呈正相关。有没有可预测的关系之间的丰富的紧急，浮叶，沉水水生植被和营养状态指标。只有在营养盐浓度最高的时候，才能预见到沉水植物的消失，湖泊以藻类为主。低于这些水平，水生植物丰度可能高或低。的磷叶绿素和磷Secchi深度的关系没有受到影响的水生植被的数量，这表明在清除湖泊的大型植物的作用可能主要是减少营养盐浓度为一个给定的负载水平。而不是营养浓度控制的水生植物的丰度，它似乎是水生植物的作用，以修改营养浓度。
We collected quantitative data on macrophyte abundance and water quality in 319 mostly shallow, polymictic, Florida lakes to look for relationships between trophic state indicators and the biomasses of plankton algae, periphyton, and macrophytes. The lakes ranged from oligotrophic to hypereutrophic with total algal chlorophylls ranging from 1 to 241 mg m(-3). There were strong positive correlations between planktonic chlorophylls and total phosphorus and total nitrogen, but there were weak inverse relationships between the densities of periphyton and the trophic state indicators total phosphorus, total nitrogen and algal chlorophyll and a positive relationship with Secchi depth. There was no predictable relationship between the abundance of emergent, floating-leaved, and submersed aquatic vegetation and the trophic state indicators. It was only at the highest levels of nutrient concentrations that submersed macrophytes were predictably absent and the lakes were algal dominated. Below these levels, macrophyte abundance could be high or low. The phosphorus-chlorophyll and phosphorus-Secchi depth relationships were not influenced by the amounts of aquatic vegetation present indicating that the role of macrophytes in clearing lakes may be primarily to reduce nutrient concentrations for a given level of loading. Rather than nutrient concentrations controlling macrophyte abundance, it seems that macrophytes acted to modify nutrient concentrations.