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首页> 外文期刊>Journal of great lakes research >Nutrient Enrichment Experiments in Tropical Great Lakes Malawi/Nyasa and Victoria
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Nutrient Enrichment Experiments in Tropical Great Lakes Malawi/Nyasa and Victoria

机译：热带大湖马拉维/尼亚萨和维多利亚州的营养富集实验

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Enrichment experiments with and without zooplankton (> 50 μm) removed were conducted in Lake Malawi during three seasons (stratified rainy, deep mixing, and stratified dry) and demonstrated that when light is adequate phytoplankton in containers quickly become nutrient deficient. The response to enrichment was assessed using chlorophyll a, photosynthesis, paniculate stoichiometric ratios, PO_4 turnover and N and P debt assays. The response to nitrogen (N), phosphorus (P), and iron (Fe) enrichments indicated that although N is the nutrient that becomes deficient most consistently, P deficiency is common as well. When Fe was added with N and P, the response by chlorophyll was four times the response to N and P without Fe. This suggests that, after N and P, Fe is the next most limiting nutrient in Lake Malawi. Light was a factor controlling phytoplankton growth in situ during the deep mixing season, and grazer removal experiments demonstrated that zooplankton > 50 μm are important in modifying the response of algae to light and nutrients. In Lake Victoria, experiments demonstrated that phytoplankton were primarily light-limited during the early-stratified season. Increased light levels resulted in N deficiency. Fe additions stimulated N uptake in both Lake Victoria and Lake Malawi and N_2 fixation in Lake Victoria.
机译：在三个季节（分层降雨，深层混合和分层干燥）的马拉维湖中进行了有浮游动物和无浮游动物（> 50μm）去除的富集实验，结果表明，当光照充足时，容器中的浮游植物会迅速变得缺乏营养。使用叶绿素a，光合作用，圆锥化学计量比，PO_4周转率和N和P债务分析评估对富集的响应。对氮（N），磷（P）和铁（Fe）富集的响应表明，尽管氮是最持续缺乏的养分，但磷缺乏也很普遍。当Fe加入N和P时，叶绿素的响应是没有Fe时对N和P响应的四倍。这表明，在氮和磷之后，铁是马拉维湖中第二大限制性营养素。在深层混合季节，光是控制浮游植物原位生长的一个因素，放牧者去除实验表明，> 50μm的浮游动物对于改变藻类对光和养分的响应至关重要。在维多利亚湖，实验表明浮游植物在早分层的季节主要是光受限的。光照水平增加导致氮缺乏。铁的添加刺激了维多利亚湖和马拉维湖的氮吸收，维多利亚湖中的N_2固着。

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