厦门海沧投资区沿岸海域初级生产力的研究

本文通过对海沧沿岸海域5个航次的现场调查，并采用该海区的浮游植物部分优势种进行 实验室模拟研究发现： 海沧投资区沿岸海域初级生产力变化范围为37．4926Z95mgCMd，年平均为150．17 mgC／m2.d，其中I区年平均值为131．67mgC／m·d，11区年平均值为168．67mgC／m2·d，PP最大值出现在秋季，为262．95mgC／m2·d。在现场采样所测得的温度范围内，温度升高对pp更有利。当光照强度小于800Olux时，PP随光强的增大而增大；在I区，PP随盐度的增大而上升；在11区，PP与盐度关系不明显。此外，PP与海水透明度呈正相关，与消光系解负相关，整个海区的浮游...学位：理学硕士院系专业：海洋与环境学院_海洋化学学号：1993480

Study of the effects of environmental factors on the biochemical compositions of four species of marine single-celled algae

在实验室模拟条件下，应用14C示踪法测定4种海洋单胞藻的光合作用速率，研究光、温度和营养盐等环境因子对藻类细胞生化组成的影响.结果表明，三角褐指藻、盐藻、中肋骨条藻和等鞭金藻适宜生长的光强范围为5.8x103~15x103lX.4种单胞藻光合作用速率随光强增加而增大，其中盐藻和等鞭金藻的光响应比较明显.随光强增加，4种单胞藻细胞的碳水化合物含量及其变化量呈增加趋势，而蛋白质含量及其变化量则减少，脂类含量变化很小.三角褐指藻、盐藻、中肋骨条藻和等鞭金藻最适生长温度分别为：14、26、21、26℃左右.在上述4个实验温度时，4种单胞藻光合作用速率最高，细胞内的碳水化合物、蛋白质、脂类含量及其变化量也达到最大值.三角褐指藻、盐藻、中肋骨条藻和等鞭金藻光合作用过程的表观活化能（E）分别为：23.2、38.5、22.4和61.7kJ/MOl，温度系数（Q10）分别为：1.74、1.74。1.38和1.69.三角褐指藻和中肋骨条藻在氮磷比（n/P）为16时，盐藻和等鞭金藻在氮磷比为28时，光合作用速率最大.在n/P为16时，4种单胞藻细胞内的碳水化合物、蛋白质、脂类含量和变化量均达到最大值.Photosynthetic rates (PR ) of four species of marlne single - celled algae were determined by means of 14 C- tracer methodunder the experimental modeling conditions.The effects of environmental factors, such as light, temperature and nutrients, on thebiochemical compositions of the algae were studied.The results indicate that the suitable light intensities for the growth of Phacodactylum tricornutum, Dunaliella spp., Skeletonema costatum and Isochrysis galbana are in the range 5.8 × 103 to 15 × 103lx,showing an increasing trend of PR with the heightened light intensities.The irradiance response of Dunaliella spp.and Isocrysisgalbana is significant.The contents of carbohydrate increase, but those of protein decrease, otherwise, the contents of lipidschanged little.The optimum temperatures for the growth of the four species of algae are 14, 26, 21 and 26℃ respectively, characterized by the maxima of PR and the contents of carbohydrate, protein and lipids as well as their variations.The apparent activationenergies in the photosynthesis process of Phaedotylum tricornutum, Dunaliella spp., Skeletonema costatum and Iswtrysis galhana are 23.2, 38.5, 22.4 and 61.7 KJ/mol respectively, and the temperature coefficients for the four algae are 1.74, 1.74,1.38 and 1 .69 respectively.The peaks of PR appeared in some culture media (N/P = 16) of Peaeodactylum tricornutum andSkeletonema costatum, while in other media (N/P = 28) of Dunaliella spp.and lsochrysis galbana.The contents and their variations of carbohydrate, protein and lipids of the four species of algae are all maximum when N/P is equal to 16 in culture media.福建省自然科学基金!D9200

PRIMARY PRODUCTIVITY AND ITS RELATIONSHIP WITH ENVIRONMENTAL FACTORS IN COASTAL WATERS ofF HAICANG, XIAMEN

1994-1995年，对厦门海沧沿岸水域初级生产力进行4个季节调查。该水域初级生产力全年平均为194.6MgC·（M2·d）-1，呈双峰型的季节变化。与九龙江口相比，厦门西港年平均初级生产力略高，这与其叶绿素α含量较高有关。九龙江口的初级生产力受海水盐度影响较大，在不同季节均呈现沿径流方向递增的趋势。海沧沿岸水域氮磷浓度比值较高，其初级生产力受水域磷含量不足所限制。Four seasonal investigations on the primary productivity in the coastal waters off Haicang, Xiamen were carried out in 1994 and 1995.The mean annual primary productivity in the waters is 194.6mgC (m2 d) -1, characterized by double-peak variation.Compared to the Jiulong River Estuary, the mean annual primary productivity in the Xiamen West Harbour is slightly high, which is relative to its higher content of chlorophyll a.Affected by the variation of salinity of seawater, the primary productivity in the Jiulong River Estuary increases towards sea in the four seasons.[N]/[P] ratio in the coastal waers off Haicang is higher, showing tha the primary productivity in the waters is limited by the shortage of phosphate.福建省自然科学基金!D9200

Biochemical composition in the phytoplankton and the effect of environmental factors in Xiamen West Harbour and the Jiulong River Estuary

厦门西港和九龙江口浮游植物碳水化合物与光强、盐度和叶绿素A均显著正相关，蛋白质与光强有负相关关系，脂类受光强的影响较小，蛋白质与碳水化合物之比与氮磷比显正相关。10月该海域浮游植物叶绿素A与生化组分含量都比4月高，与10月海水温度和海面辐照度较高有关Phytoplankton carbohydrate was significantly positively correlated with light intensity, salinity and chla in Xiamen West Harbour and the Jiulong River estuary, but protein was negatively correlated with light intensity, however, lipid was less influenced by light intensity.PRO/CHO was also positively correlated to N/P.Concentrations of biochemical composition and chla in phytoplankton in Oct were larger than in April, because of high seawater temperature and surface irradiance in the studied sea area in Oct.福建省自然科学基