The rates of dry matter and nutrient loss from decomposing Potamogeton pectinatus in a brackish south‐temperate coastal lake
The rates of dry matter and nutrient loss from decomposing Potamogeton pectinatus in a brackish south‐temperate coastal lake
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南温带咸水沿海湖泊中梳状眼子菜分解造成的干物质和养分损失率
DOI：
10.1111/j.1365-2427.1979.tb01482.x
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发表时间：
1979
影响因子：
2.7
通讯作者：
B. R. Davies
中科院分区：
文献类型：
--
作者：
C. Howard;B. R. Davies
概括。南部非洲沿海湖泊 Swartvlei 中的梳状眼子菜的分解遵循指数衰减模式。频率常数为 0.0205 天−1，158 天后腐烂几乎完成。在分解的初始阶段，由于浸出，灰分、磷和钾的原始库存比干物质损失得更快。几乎所有的钾和 60% 的磷在前 7 天内就流失了。在分解的最后阶段，分解碎屑中N和P的比例显着增加，为沿岸地区丰富的滤食动物提供了丰富的食物来源。将梳状 P. pectinatus 的分解速率与其他水生植物的分解速率进行了比较，并讨论了该物种相对较快的腐烂速率在斯瓦特弗莱湖生态中的意义。
SUMMARY. Decomposition of Potamogeton pectinatus in Swartvlei, a southern African coastal lake, followed an exponential pattern of decay. The rale constant was 0.0205 day−1 and decay was virtually complete after 158 days. The original stock of ash, phosphorus and potassium was lost more rapidly than dry matter in the initial stages of decomposition due to leaching. Almost the entire stock of potassium and 60% of the phosphorus was lost in the first 7 days. The proportions of N and P in the decomposing detritus increase significantly in the final stages of decomposition, providing a rich food source for the abundant filter-feeding animals of the littoral zone. The decomposition rate of P. pectinatus is compared with that of other aquatic macrophytes and the significance of the relatively rapid decay rate of this species in the ecology of Swartvlei lake is discussed.