Distribution and origin of biologically available phosphorus in the water of the Meiliang Bay in summer

Abstract

The investigation and continuous monitoring with an innovative iron oxide embedded cellulose acetate membrane (FeO/CAM) on the concentrations of biologically available phosphorus (BAP) were conducted in the Meiliang Bay of the Taihu Lake during summer in 2004. The results showed that the concentrations of dissolved (FeO-DP), particulate (FeO-PP) and total bioavailable phosphorus (FeO-P) had similar horizontal distribution. The BAP concentrations were the highest in those estuaries in the northern bay. With the decrease of the distance to the estuary or long shore, there was little difference between BAP concentrations in an open lake area. During the observation period, algal blooms occurred in most waters of the northern bay, which was reflected from the high concentrations of chlorophyll a (Chl-a). While they were not highest in the estuarine waters of those major rivers, this is the case for the BAP concentrations. The concentrations of Chl-a had a significantly positive correlation with those of bioavailable phosphorus in the open area of the Meiliang Bay. With the sediment resuspension induced by wind and wave, BAP concentrations increased in a short-term, indicating that the riverine P inputs mainly contribute to the concentrations of BAP in the estuarine water while internal P release was the major source of BAP in the open lake area. In the eutrophic shallow lake, the blooms of alga may cause pH increase and further result in internal P release. The above results showed that the new membrane of FeO/CAM can be used to monitor the concentrations of BAP and provide the scientific justifications for the control strategy of the lake eutrophication.

Distributions and Sources of Heavy Metals in Seawater of the Northern Beibu Gulf

“…Content of Cu in surface water (SCu) were high at the east of Baizilong islands, caused by inputs of rivers in Vietnam which is mainly attributed to Red River. The average annual runoff of Red River is 1230×10 8 m 3 [14] , far more than the sum of rivers' (190×10 8 m 3 ) [6] from the north of Beibu Gulf, freshwater from Vietnam join into the little anticlockwise ocean circulation and then mix into the big anticlockwise ocean circulation [15] at the east of Baizilong Islands in spring and summer, so this area has accumulated much amount of Cu contributed by rivers from Vietnam; Contents SCu and BCu (bottom water Cu) were high at the off-sea (HB24) of Lingao county of Hainan Province, but content of Cu in sediment of HB24 was very low (4.11 µg/g), so this area was due to the dissolution of suspended particles (SS) rather than the sediment. High content areas of Pb in surface water situated in the northern coastal and the southern area of the gulf, which attributed to the inputs of rivers and pollution discharge of northern cities [9] , and dissolution of SS and atmospheric deposition for the southern area.…”

Degradation Characteristics of Phosphorus in Phytoplankton-Derived Particulate Organic Matter and Its Effects on the Growth of Phosphorus-Deficient Microcystis aeruginosa in Lake Taihu

“…This experiment simulated the cyanobacteria degradation process during cyanobacteria accumulation in Taihu Lake. The initial concentration of Chl a in the culture system was about 877.45 μg·L −1 , which was common in the cyanobacteria accumulation area of Taihu Lake Bay [38,39]. The initial content of POM in water was about 130.12 mg·L −1 , which is similar to SS content in Meiliang Bay of Taihu Lake during summer [40] and much higher than that of Jiaozhou Bay in summer (12–17.4 mg·L −1 ) [41].…”

Evolution of deep‐sea fisheries policies in China: Review, performance and prospects

“…The Chinese deep-sea aquaculture industry needed long-term development planning and further regulation of deep-sea aquaculture enterprises (Huang, 2006). Therefore, the government promulgated a series of policies related to deep-sea fisheries management standards.…”