Modelling phosphorus fluxes in the hypertrophic Loosdrecht Lakes
Modelling phosphorus fluxes in the hypertrophic Loosdrecht Lakes
复制标题
对肥厚的洛斯德雷赫特湖中的磷通量进行建模
DOI：
10.1007/bf02256750
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
T. Aldenberg
中科院分区：
文献类型：
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作者：
J. Janse;T. Aldenberg
一个动态的，确定性的模型来模拟磷循环和浮游生物的生长在浅，富营养化Loosdrecht湖泊（荷兰）恢复措施之前和之后。除了无机磷（SRP）在地表水和间隙水，该模型包括三个藻类群体，浮游动物，鱼类，碎屑，底栖动物和上层沉积物（所有模拟的碳和磷）。在模型系统中，磷循环是完全封闭的。碳和磷被独立地描述，因此可以模拟P/C比的动态。泥沙过程以简化形式描述，模拟值在很大程度上在观测值范围内。悬浮物的碎屑部分（=浮游植物+碎屑）从夏季的50-60%到冬季的90%左右不等。在一年的大部分时间里，地表水的SRP非常低。藻类和碎屑磷对外来磷输入的敏感性大于藻类和碎屑碳和叶绿素a。因此，正如在湖泊中观察到的那样，恢复措施后悬浮物的P/C比下降，而浮游动物和鱼类的P/C比保持不变。磷从沉积物中的动员减少，减少外部输入。适应的模型系统，以减少负载发生在大约两年内。在模型中的不确定性的来源包括有限的知识选择性放牧以及死亡率和矿化过程。
A dynamic, deterministic model is presented to simulate the phosphorus cycle and plankton growth in the shallow, hypertrophic Loosdrecht Lakes (The Netherlands) before and after restoration measures. Besides inorganic phosphorus (SRP) in both the surface water and the interstitial water, the model comprises three algal groups, zooplankton, fish, detritus, zoobenthos and upper sediment (all modelled both in carbon and in phosphorus). Within the model system, the phosphorus cycle is completely closed. Carbon and phosphorus are described independently, so that the dynamics of the P/C ratios can be modelled. Sediment processes are described in a simplified form.Simulated values are largely within the range of observed ones. The detrital fraction of the seston (=phytoplankton+detritus) varies from 50–60% in summer to about 90% in winter. SRP in the surface water is very low during most of the year. Sensitivity for external phosphorus input is larger for algal and detrital P than for algal and detrital C and chlorophyll-a. So the P/C ratio of the seston decreases following restoration measures, as is observed in the lakes, while the much higher P/C ratios of zooplankton and fish remain constant. Phosphorus mobilisation from the sediment decreases with decreasing external input. Adaptation of the model system to the reduced loading takes place within about two years.Sources of uncertainty in the model include the limited knowledge on selective grazing as well as on mortality and mineralisation processes.