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The role of submerged macrophytes and macroalgae in nutrient cycling: A budget approach

机译：沉水植物和大型藻类在营养循环中的作用：一种预算方法

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This study used a budget approach to determine the effect of submerged macrophytes and macroalgae on the storage of N and P in an estuary. Above and below ground tissue content of nitrogen and phosphorus were determined for the various macrophyte species. The mouth of the estuary was artificially breached in February 2011 with a volume of 0.3 x 10(6) m(3) and closed a week later. A 1:100 year flood with volume close to 3 x 10(6) m(3) breached the mouth naturally in June 2011 flushing water and sediment out of the estuary. In order to track the change in the nutrient acquisition of the submerged macrophytes and macroalgae over a closed-mouth state, the nutrient budget was constructed for the period February 2011 to July 2011, from the time the mouth closed until it opened again. Relative to other inputs the sediment contributed 30% of the TN and 40% TP toward the nutrient budget, while the submerged macrophytes and macroalgae stored 20-30 % TN and 30-38 % TP. The river and precipitation contributed less than 3% of the TN and TP input. It was previously thought that the sediments of South African temporarily open/closed estuaries did not have the necessary organic stock to fuel primary production. However this research showed this to be incorrect. Submerged macrophytes and macroalgae significantly influenced nutrient cycling and this is the first detailed account of incorporating vegetation into a nutrient budget without relying solely on C:N:P ratios. (C) 2015 Elsevier Ltd. All rights reserved.
机译：这项研究使用一种预算方法来确定淹没的大型植物和大型藻类对河口N和P储存的影响。确定了各种大型植物物种的地下和地下组织中氮和磷的含量。在2011年2月，人为地破坏了河口的口，体积为0.3 x 10（6）m（3），并在一周后关闭。 1：100年的洪水体积接近3 x 10（6）m（3），在2011年6月自然冲破了河口，将水和沉积物冲出河口。为了跟踪密闭状态下淹没的大型植物和大型藻类养分获取的变化，从2011年2月到2011年7月，从嘴巴张开到再次张开，制定了养分预算。相对于其他投入，沉积物贡献了30％的总氮和40％的总磷，对营养平衡，而淹没的大型植物和大型藻类储存了20％至30％的总氮和30％至38％的总磷。河流和降水贡献的总氮和总磷不到3％。以前认为，南非临时开/关河口的沉积物没有必要的有机储量来为初级生产提供燃料。但是这项研究表明这是不正确的。淹没的大型植物和大型藻类极大地影响了养分循环，这是第一个详细说明将植被纳入养分预算的详细说明，而不仅仅是依靠C：N：P比率。 （C）2015 Elsevier Ltd.保留所有权利。

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