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- W2384452468 abstract "Daya Bay,a rapidly urbanizing area,received anthropogenic nutrient loading.Some researches showed the primary limitation nutrient in Daya Bay was experiencing the transition from N-limit to P-limit.Changes in nutrient regime could have negative ecological effects on the bay.Phytoplankton nutrient limitation was studied during spring(April 2006).Seven factorial nutrient enrichment experiments were carried out in various locations in the bay,including outer middle inter of the bay.The experiments included additions of nitrogen(N),phosphorus(P) and silicate(Si) at a mole ratio of 16N∶10P∶16Si,additions of iron(Fe) and a synthetic chelator ethylenediaminetetraacetic acid(EDTA).The water was sampled from 3 stations and the experiment period was 3 days.To evaluate the nutrient limitation patterns,time series of chlorophyll a concentrations were analyzed using one-way ANOVA model and ranking method and the apparent nutrients depletion time were estimated.The two ways could explain each other.According to depletion time sequence results,phosphorus was running out in 48h at St.3 and St.2,revealing that phytoplankton was limited by phosphorus at St.2 and St.3.At St.1,nitrogen depletion time(94h)was faster than the others(P depletion time 107h and Si depletion time 114h).As the phosphorus deviation the Redfield ratio by 10 times,the result showed that N-limitation was not so determinate.For the analysis results of chlorophyll a concentrations,St.1 was N-limitation obviously.For St.2,the chlorophyll a analysis results showed P and Si co-limited.Compared with the depletion time sequence,because each nutrient had a high bioavailability,the phytoplankton grew well in every experiment unit at the station.As for chlorophyll a concentration,the variance between experiment units and control unit was not so significant.The analysis results of chlorophyll a concentrations at St.3 accorded with that of depletion time sequence.Iron had a positive effect on depletion rates of nitrogen.At St.1 and St.3,compared with AF and All units,the depletion rates increased by 0.05μmol N/(L·h) and 0.02μmol N(L·h),respectively.And when iron and phosphate were added in at one time,it's necessary to add EDTA to prevent phosphate sedimentation from shaping.Our study showed that there exists a spatial variation in the phytoplankton limitation patterns,generally P-limited at the bottom and middle of the bay and N-limited outer of the bay.The tidal current of regional difference in Daya Bay may be the main cause." @default.
- W2384452468 created "2016-06-24" @default.
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- W2384452468 date "2007-01-01" @default.
- W2384452468 modified "2023-09-23" @default.
- W2384452468 title "Nutrient factors limiting phytoplankton production of Daya Bay in spring" @default.
- W2384452468 hasPublicationYear "2007" @default.
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