Modelling the response of a highly eutrophic lake to reductions in external and internal nutrient loading
Modelling the response of a highly eutrophic lake to reductions in external and internal nutrient loading
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模拟高度富营养化湖泊对外部和内部养分负荷减少的响应
DOI：
10.1080/00288330.2010.548072
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发表时间：
2011
影响因子：
1.6
通讯作者：
D. Trolle
中科院分区：
文献类型：
--
作者：
D. Özkundakci;David P. Hamilton;D. Trolle
将大量营养素减少到限制初级生产的水平往往是缓解富营养化和减少藻类水华的可能性的关键因素。尽管实施了密集的集水区和湖内恢复方案，奥卡罗湖仍保持高度富营养化，包括实施人工湿地、保护河岸、应用明矾和应用改性沸石矿物(Z2G1)以减少内部营养物质负荷。基于过程的一维生态系统模型(DYRESM-CAEDYM)被用来研究进一步降低氮(N)和磷(P)营养负荷的必要性。该模型根据两年的现场数据进行了校准，并在两个独立的一年期间进行了验证。模型模拟表明，用营养级指数(TLI)定量衡量的湖泊营养状态可以从高度富营养化转变为中营养化，N和P的外部和内部负荷都减少了75%-90%。营养负荷减少的幅度表明，在能够实现富营养化湖泊营养状态类别之间的过渡方面，这是一个重大挑战。
The reduction of macronutrients to levels that limit primary production is often a critical element of mitigating eutrophication and reducing the potential for algal blooms. Lake Okaro has remained highly eutrophic despite an intensive catchment and in-lake restoration programme, including implementation of a constructed wetland, riparian protection, an alum application and application of a modified zeolite mineral (Z2G1) to reduce internal nutrient loading. A one-dimensional process-based ecosystem model (DYRESM-CAEDYM) was used in this study to investigate the need for further nutrient loading reductions of both nitrogen (N) and phosphorus (P). The model was calibrated against field data for a 2-year period and validated over two separate 1-year periods. Model simulations suggest that the trophic status of the lake, measured quantitatively with the Trophic Level Index (TLI), could shift from highly eutrophic to mesotrophic with external and internal loads of both N and P reduced by 75–90%. The magnitude of the nutrient load reductions is indicative of a major challenge in being able to effect transitions across trophic state categories for eutrophic lakes.