Effects of salinity , pH, nitrogenous and phosphate nutrients on the growth rate of four species of benthic diatoms were studied by using the method of in situ optical density measurement . The optimal culture conditi...Effects of salinity , pH, nitrogenous and phosphate nutrients on the growth rate of four species of benthic diatoms were studied by using the method of in situ optical density measurement . The optimal culture conditions for the four species of diatoms are as follows: for Amphora coffeaeformis , s 35 ; pH 8.5; N03 -N 1.54, NH4-N, 7.0; CO (NH2)2-N, 2.5 (mg/L); PO43--P 1.13 (mg/L) ; for Cocconeis scutellum var parva , s 30 ; pH 8.5 ; NO3-N 3.08, NH4+-N 3.5, CO(NH2)2-N 5.0 (mg/L); pO43-－P0.283 (mg/L), for Navicula corymbosa s 25; pH 8.0; N03- －N 1.54, NH4+ -N 3.5, CO(NH2)2-N 5.0(mg/L); PO43-－P0.565 (mg/L), for Navicula mollis , s 25 ; pH 8.0; NO3- － 1.54 NH4+ - N 1.75, CO(NH2)2 -N 1.25 (mg/L), P043-－P 0.141(mg/L).展开更多
Effects of iron and silicon nutrients and of orthogonal combinations of nitrogen, phosphorus, iron and silicon on the growth rate of three benthic diatoms were studied by using an in situ OD measurement method. The re...Effects of iron and silicon nutrients and of orthogonal combinations of nitrogen, phosphorus, iron and silicon on the growth rate of three benthic diatoms were studied by using an in situ OD measurement method. The results of monofactor tests of ironand silicon shawed that Fe-EDTA was bettef than ferric citrate in the culture of these diatoms;that the favourable concentration of Fe-EDTA was about 0.5 mg/L of Fe and that of silicate was 2.5 mg/L of Si or more.The orthogonal test showed that the optimal concentration ratios(mg/L)of nitrogen, phosphorus, iron and silicon were: 5. 0: 0. 25: 0.5: 2. 0 for Cocconeis scutellum var. parva; 2.5: 1.0: 1.0: 2.0 for Amphora coffeaeformis; and 5.0: 0. 15: 0.5: 2.0 for N. mollis.展开更多
Effects of temperature and light intensity on the groWth rate of four species of benthic diatoms for feeding abalone were studied by using a novel method (in situ optical density measurement)which was simple, convenie...Effects of temperature and light intensity on the groWth rate of four species of benthic diatoms for feeding abalone were studied by using a novel method (in situ optical density measurement)which was simple, convenient, fast, accurate and reliable for determining biomass of benthic algae. The results showed that the favourable temperature and light intensity were as follows: for Amphora coffeaeformis, 30℃, 18 W/m2 for Cocconeis scutellum var. parv. 18℃, 20 W/m2; for Navicula Corymbosa, 18℃. 12.4 W/m2;for Navicula mollis, 24℃, 6 W/m2.展开更多
厦门海域潮间滩涂小型底栖藻类的叶绿素a的年变化范围为0.35—130mg/m^2,平均为18.5mg/m^2,脱镁叶绿素年变化范围为0.2—411mg/m^2,平均为57.9mg/m^2。在43属162种及变种的底栖硅藻中,常见的优势种有小伪菱形藻双楔变种(Pseudo-Nitzschi...厦门海域潮间滩涂小型底栖藻类的叶绿素a的年变化范围为0.35—130mg/m^2,平均为18.5mg/m^2,脱镁叶绿素年变化范围为0.2—411mg/m^2,平均为57.9mg/m^2。在43属162种及变种的底栖硅藻中,常见的优势种有小伪菱形藻双楔变种(Pseudo-Nitzschia sicula v. Bicuneata)和弯菱形藻(Nitzschia sigma)等。研究结果表明:生态环境的不同导致两种叶绿素比值的变化,河口区海水盐度的梯度分布决定底栖硅藻种群结构的差异,各个时期温度、降雨等环境因素的变化影响种群数量在潮区间的分布。展开更多
文摘Effects of salinity , pH, nitrogenous and phosphate nutrients on the growth rate of four species of benthic diatoms were studied by using the method of in situ optical density measurement . The optimal culture conditions for the four species of diatoms are as follows: for Amphora coffeaeformis , s 35 ; pH 8.5; N03 -N 1.54, NH4-N, 7.0; CO (NH2)2-N, 2.5 (mg/L); PO43--P 1.13 (mg/L) ; for Cocconeis scutellum var parva , s 30 ; pH 8.5 ; NO3-N 3.08, NH4+-N 3.5, CO(NH2)2-N 5.0 (mg/L); pO43-－P0.283 (mg/L), for Navicula corymbosa s 25; pH 8.0; N03- －N 1.54, NH4+ -N 3.5, CO(NH2)2-N 5.0(mg/L); PO43-－P0.565 (mg/L), for Navicula mollis , s 25 ; pH 8.0; NO3- － 1.54 NH4+ - N 1.75, CO(NH2)2 -N 1.25 (mg/L), P043-－P 0.141(mg/L).
文摘Effects of iron and silicon nutrients and of orthogonal combinations of nitrogen, phosphorus, iron and silicon on the growth rate of three benthic diatoms were studied by using an in situ OD measurement method. The results of monofactor tests of ironand silicon shawed that Fe-EDTA was bettef than ferric citrate in the culture of these diatoms;that the favourable concentration of Fe-EDTA was about 0.5 mg/L of Fe and that of silicate was 2.5 mg/L of Si or more.The orthogonal test showed that the optimal concentration ratios(mg/L)of nitrogen, phosphorus, iron and silicon were: 5. 0: 0. 25: 0.5: 2. 0 for Cocconeis scutellum var. parva; 2.5: 1.0: 1.0: 2.0 for Amphora coffeaeformis; and 5.0: 0. 15: 0.5: 2.0 for N. mollis.
文摘Effects of temperature and light intensity on the groWth rate of four species of benthic diatoms for feeding abalone were studied by using a novel method (in situ optical density measurement)which was simple, convenient, fast, accurate and reliable for determining biomass of benthic algae. The results showed that the favourable temperature and light intensity were as follows: for Amphora coffeaeformis, 30℃, 18 W/m2 for Cocconeis scutellum var. parv. 18℃, 20 W/m2; for Navicula Corymbosa, 18℃. 12.4 W/m2;for Navicula mollis, 24℃, 6 W/m2.
文摘厦门海域潮间滩涂小型底栖藻类的叶绿素a的年变化范围为0.35—130mg/m^2,平均为18.5mg/m^2,脱镁叶绿素年变化范围为0.2—411mg/m^2,平均为57.9mg/m^2。在43属162种及变种的底栖硅藻中,常见的优势种有小伪菱形藻双楔变种(Pseudo-Nitzschia sicula v. Bicuneata)和弯菱形藻(Nitzschia sigma)等。研究结果表明:生态环境的不同导致两种叶绿素比值的变化,河口区海水盐度的梯度分布决定底栖硅藻种群结构的差异,各个时期温度、降雨等环境因素的变化影响种群数量在潮区间的分布。
