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首页> 外文期刊>Hydrobiologia >Decreasing nitrogen loading and climate change promotes the occurrence of nitrogen-fixing cyanobacteria in a restored city lake
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Decreasing nitrogen loading and climate change promotes the occurrence of nitrogen-fixing cyanobacteria in a restored city lake

机译：降低氮负载和气候变化促进恢复城市湖中的氮素固定性蓝细菌的发生

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摘要

External loading reduction has been implemented to improve water quality in China since the 2000s. To evaluate the effects of nutrient reduction on phytoplankton, long-term monitoring data for Lake Wuli from 1998 to 2017 were analyzed. After the restoration since 2003, nitrogen decreased significantly from 8 to 2 mg/l until 2008 and then remained stable until 2017, while total phosphorus declined progressively from 0.2 mg/l to approximately 0.08 mg/l during 2003 and 2017. Biological data indicated that phytoplankton biovolume decreased after restoration until 2010 and then increased slightly from 2010 to 2017, mainly due to increasing of cyanobacterial biovolume. The dominant taxa shifted from cryptophyta to cyanobacteria since 2009. The results of both nonmetric multidimensional scaling and random forest regression showed that changes in nutrients, especially decreases in nitrogen, were the main drivers for phytoplankton community variation and increasing of cyanobacterial biovolume to the total phytoplankton biovolume ratio in summer and autumn. In addition to nutrients reduction, climatic variables such as wind speed decrease also played vital roles in increasing of cyanobacterial dominance in Lake Wuli. Our study confirmed that phytoplankton community respond strongly to nitrogen reduction in the subtropics and that climate change mediates the response.
机译：自2000年代以来，已实施外部装载减少以改善中国的水质。为了评估营养减少对浮游植物的影响，分析了1998年至2017年沃利湖的长期监测数据。自2003年以来恢复后，氮气从8至2mg / L显着降低，直到2008年直到2008年，直到2017年仍然稳定，而总磷在2003年和2017年期间从0.2 mg / L逐渐下降至约0.08 mg / L.“生物数据表明在恢复后，植物植物生物豆减少，直到2010年从2010年到2017年略有增加，主要是由于含有蓝藻生物肿大的增加。自2009年以来从Cryptophyta转移到Cyanobacteria的主导分类群。非化品多维缩放和随机森林回归的结果表明，营养素的变化，特别是氮气中的植物，是植物群落变异和增加蓝藻生物植物的主要驱动因素到总浮游植物生物宽度比率在夏季和秋季。除了减少营养素外，风速降低的气候变量也在沃利湖中的蓝藻优势增加时发挥了重要作用。我们的研究证实，Phytoplancton界对亚热带的氮气减少，气候变化介导反应。

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