大鹏湾反曲原甲藻种群变化率动态模型研究

大鹏湾反曲原甲藻种群变化率动态模型研究黄贯虹（广东民族学院计算机科学系，广州５１０６３３）郭远琼黄伟建（暨南大学华侨医院计算机室，广州５１０６３２）（暨南大学水生生物研究所，广州５１０６３２）ＳｔｕｄｙｏｆａＭｏｄｅｌｏｎＣｈａｎｇｅＲａｔｉｏｏｆｔ...

Study of a Model on Change Ratio of the Population Densities Dynamics of Prorocentrun sigmoides Bohm in the Dapeng Bay, South China Sea.

A change ratio model was made to analysis population density dynamic of Prorocentrun sigmoides Bohm in the Dapeng Bay, South China Sea. The data were based on the samples taken at intervals of 2nd from 30 March to 10 June 1990. On the basis of conductions of the previous papers, early days density and change ratio of Prorocentrun sigmoides Bohm, temperature and its change ratio, concentrations and change ratio of dissolved inorganic nitrogen (DIN, including NO 3_N and NO 2_N) and inorganic phosphate (DIP) were identified the relationship with change ratio of later stage Prorocentrun sigmoides Bohm. Using calculus of variations, the authors identified the change ratio model of the population density dynamics of Prorocentrun sigmoides Bohm. Six change ratio models were established. The formula is: d Q t d t=a 0 a 1 d Q t-1 d t a 2Q t-1 a 3T t a 4 d T t d t a 5N t a 6 d N t d t a 7P t a 8 d P t d t The fitting degree between the calculations and field data was quite accurate. The results provided a scientific basis for controlling red tide of Prorocentrun sigmoides Bohm.