里湖浮游藻类与氮、磷营养盐的相关性

１９９６．４～１９９７．１对肇庆七星岩里湖水体进行了４次实地调查，每季度采集样品１次．对水体浮游藻类ｃｈｌａ和Ｎ，Ｐ，营养盐进行定量测试，根椐实测数据，探讨其含量水平；分布特征和各要素含量之间的相关性．为里湖水质的保护；水体富营养化的预测及研究富营养化的发生机制提供依据．

香溪河库湾春季水华期间硝酸盐、磷酸盐的时空分布

在三峡水库香溪河库湾春季水华连续暴发期间(2005年2月26日—4月28日)对香溪河与长江汇合处(河口)至香溪河库湾上游库尾处总计14个采样点进行连续监测,结果表明硝酸盐和磷酸盐在库湾中存在明显的时空分布规律。在空间上,河口的硝酸盐浓度高,库尾浓度低,其变化趋势是随着与河口距离的增加而降低;磷酸盐的分布规律是库尾的浓度高,河口的浓度低,其变化趋势与硝酸盐恰好相反。各采样点硝酸盐和磷酸盐浓度在时间上也呈现出明显的规律。河口硝酸盐的浓度在不同时间变化幅度较小,库尾采样点的硝酸盐浓度的变化幅度较大,随着与河口距离的增加硝酸盐浓度在不同时间的变化幅度逐渐增大。各样点磷酸盐在时间上的变化趋势是样点S04-S08的变化幅度较大,位于香溪河库湾河口和库尾的变化幅度较小。

灌河口邻近海域春季浮游植物的生态分布及其营养盐限制

2011年4月通过灌河口邻近海域的现场调查及营养加富培养实验,研究了春季灌河口邻近海域浮游植物生态分布特征以及硝酸盐、磷酸盐对浮游植物生长的限制作用,结果表明:共发现浮游植物68种,其中硅藻61种,优势度最高的为中肋骨条藻(Skeletonema costatum,Y=0.53),各个站位浮游植物的丰度介于0.84×106—2.25×106个/L,均值为1.54×106个/L,种类范围为29—39种,均值为35种,叶绿素a浓度呈现近岸高外海低的特征,在2.66—6.67μg/L变化,均值为3.89μg/L,多样性指数介于2.60—3.79,均值为3.20,海域环境基本适宜浮游植物的生长;调查海域磷酸盐浓度的范围为0.35—0.90μmol/L,均值为0.58μmol/L,亚硝酸盐浓度范围为1.57—3.93μmol/L,均值为3.08μmol/L,两者分布均具有近岸高外海低的特征;铵盐浓度范围为3.14—5.43μmol/L,均值为3.95μmol/L,其分布则是近岸低外海高;硝酸盐浓度严重偏高,在31.21—37.00μmol/L之间变化,均值为34.55μmol/L,导致调查区域具有高N/P比(42—112),且浮游植物叶绿素a与磷酸盐浓度有显著的正相关(R2=0.80),而与无机氮线性关系不明显(R2=0.11);在P加富培养实验中,磷酸盐在3个培养组(对照,+P,++P)中的比吸收速率分别为0.36、0.43、0.51d-1,加P促进了P本身的吸收.,硝酸盐和亚硝酸盐的吸收也得以促进,但没有磷酸盐那么显著,而铵盐浓度基本呈增加趋势,P的添加也促进了藻类的生长,培养结束后叶绿素a浓度最大值分别为77.24、90.57、96.49μg/L。在N加富培养实验中,硝酸盐的比吸收速率分别为0.39、0.049、0.025d-1,加N未促进硝酸盐本身的吸收,磷酸盐浓度在3个实验组变化曲线相似,其吸收也没有得到促进,亚硝酸盐在加N组中浓度是增加的,培养结速后加N组(+N,++N)叶绿素a浓度最大值分别为72.31、69.62μg/L,都小于对照组,N的添加也未促进藻类的生长。上述研究表明了春季灌河口邻近海域浮游植物的生长主要受到P的限制,而不是N限制。

Factors affecting spring bloom in the South of Cheju Island in the East China Sea

A soil circulation occurs in the south of Cheju Island in the spring. Nutrients and its influence on chloro-phyll a （Chla） around the circulations were studied from April 9 to May 6, 2007. Spring bloom with elevated concentrations of Chla was observed during the investigation. High concentrations of phosphate, nitrate and silicate at 0.6, 12, and 8 mmol/m3, respectively, were detected. A low water temperature prevented the growth of phytoplankton. Chla concentrations in the study area might be strongly associated with the high silicate concentration.

Temporal and Spatial Distribution of Nutrients and HABs at Coastal Water of Kota Belud, Sabah

A study was carried out to determine the temporal and spatial distribution of nutrients and Harmful Algal Blooming species (HABs) to establish the relationship between nutrient concentrations and HABs density in the coastal water of Kota Belud, Sabah, Malaysia. Eight stations were set up in four transects (each transect had two stations;one 500 meters seawards from shoreline, and another five kilometers seawards from shoreline) along the Kota Belud coastal area. Phytoplankton samples, water samples and in situ environmental parameters were collected during dry and wet seasons. Altogether nine HABs species were identified from the study area, where six species (Pyrodinium bahamense, Prorocentum micans, Neoceratium furca, Prorocentum sigmoides, Dinophysis caudate, and Neoceratium fursus) belonged to Dinophyceae and three species (Thalassionema nitzchoioides, Chatoceros affinis, Rhizosolenia sp.) belonged to Bacillariophyceae. Among nine species, Chatoceros affinis was the most abundance composed of 80.6% of total species recorded from all stations during study period. Among the toxic producing Dinoflagellate, Pyrodinium bahamense bloom (>103 cells/l) was observed during study period. Trong linear relationship (r2 = 0.80) was observed between the cell density and concentration of nitrate nitrogen. Relationship between cell density and phosphate phosphorus was poor (r2 = 0.51). The study showed that increasing in nutrient concentrations resulted in the increasing of HABs density. Nitrate was seen to be more important than phosphate in Kota Belud water as limiting factor of the growth of HABs.

肇庆市七星岩里湖水化学因子相关性研究

Four seasonal field investigations have been conducted in the Seven Stars Lake in Zhaoqing between Apr.1996 and Jan.1997. The water of the lake was sampled once for each season. Three major eutrophication elements, phytoplankton,nitrate and phosphate were analyzed quantitatively. According to the monitoring data,the concectration levels of the elements and their distributions,relationships among the elements were analyzed. The results are important for predicting eutrophication of the water and studying the mechanisms of the eutrophication in the Seven Sear Lake.

天津近岸浮游植物群落对海洋酸化和硝酸盐加富的响应

为了评估海洋酸化和富营养化耦合作用对近海浮游生态环境的影响,本研究以天津市近岸海域浮游植物群落的生物地球化学指标为研究对象,分别采用一次性及连续培养的方式模拟自然水华及稳态条件,探究其对二氧化碳(CO_(2))和硝酸盐浓度变化及二者耦合作用的响应。实验条件设置如下:1)对照:二氧化碳分压p(CO_(2))40.53 Pa、无硝酸盐添加;2)酸化:p(CO_(2))101.3 Pa、无硝酸盐添加;3)加N:p(CO_(2))40.53 Pa、添加硝酸盐50μmol·L^(-1);4)酸化加N:p(CO_(2))101.3 Pa、添加硝酸盐50μmol·L^(-1)。实验结果表明,硝酸盐加富比酸化更加显著地促进浮游植物群落总叶绿素(Chl a)生物量及颗粒有机碳(POC)和颗粒有机氮(PON)积累,酸化和加N使浮游植物群落粒径大小升高。连续培养实验表明,酸化和N加富对Chl a、生物硅(BSi)、PON浓度、PON与颗粒有机磷(POP)比值(N/P)、POC与BSi比值(C/BSi)及沉降速率有协同交互作用,对POP和POC浓度及POC与PON比值(C/N)有拮抗性交互作用。在一次性培养后,酸化显著降低了浮游植物群落的沉降速率;而在连续培养后,酸化和N加富使浮游植物群落沉降速率显著升高。这些结果表明酸化和N加富对与近岸浮游植物相关的生物地球化学循环及在不同生长阶段的种群碳沉降存在不同的潜在影响及交互效应。

筼筜湖藻类与氮磷营养盐相关性研究

筼筜湖是厦门市区内唯一人工湖泊,近年来其水质污染日益严重,引起市民的极大关注,清淤截污工程不断深化。2009年1月至2011年11月逢单月采集样品,对筼筜湖水体浮游藻类叶绿素a和总磷、总氮项目进行监测分析,根椐实测数据,探讨叶绿素a与总磷、总氮各营养盐要素含量之间的相关性。为筼筜湖水质的保护,水体富营养化的预测及研究富营养化的发生机制提供依据。