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1 28 5 Vol. 28, No ACTA OCEANOLO GICA SIN ICA Septemper ,2, 1, 1 3, 3, 1, 1, 1, 1 (1., ;2., ;3., ) : ( T hal assiosi ra pseu donana Hasle et Heimdalh) ( Gy m nodi ni um sp. ),., N/ P = 16,, a, N/ P 1,N/ P = 6 1 a N/ P 1 N/ P, 1. : ; ; ; : Q17811 : A : (2006) ,,. ( T hal assiosi ra pseu donana Hasle et Heimdal ) ( Gy m nodi ni um sp. ).,,, ;,.., [1 4 ]., N/ P,. N/ P,, N/ P, ( N/ P ) [2 ]., [3 ]., N/ P,., N/ P [4 ].,,. : ; : : (D96012) ; (A01305) ; (2001CB409701). : (1980 ),,,, 1 E2mail edu. cn,e2mail edu. cn

118 28 2 2. 1 EPICS XL Coulter ( ), UN ICO TM 7200 spectrop hotometer (OD ), Olymp us B HΟ2 ( ), TDLΟ40B ( ), KQΟ100DB ( ),D KΟ8D ( ). 2. 2,. f/ 2ΟSi, 30 32, 3 000 lx, L D = 12 12.,. 1 ml (8.

2 EPICS XL Coulter ( ), UN ICO TM 7200 spectrop hotometer (OD ), Olymp us B HΟ2 ( ), TDLΟ40B ( ), KQΟ100DB ( ),D KΟ8D ( ). 2. 2,. f/ 2ΟSi, 30 32, lx, L D = ,. 1 ml ( / cm 3 ) ml ( / cm 3 ) 100 ml, 3,. f/ 2ΟSi, NaNO3 Na H2 PO3 1,. (2), a 90 %(v/ v), [5 ].,,NO2 - N Ο,NO3 - N Ο,N H3 - N [ 6 ] ,2., 5,,, 6, ( : 10 6 / cm 3 ). 2,3 ( max ) K, G(d),,,, ;, [7 ],1986 [8 ],, Davis [9 ]. 1 N, P N/ P DIN/ mol dm - 3 DIP/ mol dm - 3 N/ P 0 # # # # # (1) ( EPICS XL Coulter),,. : : K = lg ( N t/ N 0 ) / T, N t, N 0 Tt, T0. : G(d) = / K. : = ln ( N 2 - N 1 ) / ( T2 - T1 ), N 2, N 1 T1, T2. 3,4,,, 12, 11. 3,4,,. 7,8,,,.,,,

5 : 119 2 3,, [10 ]. 3. 2 Reynolds [11 ] ( max ) [11 ]. max,, [12 ]., K, G(d) max.

, (N/ P < 16), 1 ( N/ P = 6), K, max a, G( d) ; (N/ P > 16), 4 (N/ P = 237. 5),,, [13,14 ].

534 1 # 12. 37 (3) 0. 537 0. 561 2 # 12. 05 (4) 0. 513 0. 587 3 # 12. 32 (3) 0. 528 0. 570 4 # 12. 21 (3) 0.

3 5 : ,, [10 ] Reynolds [11 ] ( max ) [11 ]. max,, [12 ]., K, G(d) max. 2,3 6,7,, 3 max, (N/ P = 16) K, max, G(d), a. Redfield (N/ P = 16),., (N/ P < 16), 1 ( N/ P = 6), K, max a, G( d) ; (N/ P > 16), 4 (N/ P = ),,, [13,14 ]., 4, 8,9,, 1 (N/ P = 6) K a max, G(d),. 1 (N/ P = 6)., [15 ]. 2 max K3 G(d) 0 # (3) # (3) # (4) # (3) # (3) ,5 max K, G(d).., max K3 G(d) 0 # (3) # (3) # (3) # (3) # (3)

120 28 4 max K8 G(d) 0 # 6. 68 (9) 0. 177 1. 697 1 # 7. 59 (8) 0. 205 1. 468 2 # 6.

496 5 max K9 G(d) 0 # 5. 90 (11) 0. 058 5. 163 6 a 1 # 5. 36 (10) 0. 042 7. 240 2 # 4.

886 : Kt,t t ; max ; G(d) ; max (d)., 5 1 (N/ P = 6),,,. a,,,,,,,. Howart h [3 ],,, [3 ].

4 max K8 G(d) 0 # (9) # (8) # (10) # (8) # (8) max K9 G(d) 0 # (11) a 1 # (10) # (12) # (10) # (9) : Kt,t t ; max ; G(d) ; max (d)., 5 1 (N/ P = 6),,,. a,,,,,,,. Howart h [3 ],,, [3 ] a N/ P, DNA,RNA,,,. a ( 6,7). N/ P = 16, N/ P = 6 ( ) N/ P = ( ),,,, [ 16,17 ].. ( ),., a, K, K ( 8,9). 1 (N/ P

Are changes in N : P ratios in coastal waters t he key to increased red tide blooms[j ]. Hydrobiologia,1997,352 : 141 147. [ 3 ] HOWAR T H R W.

5 5 : 121 = 6) K, 4. 8 a 9 4 (1) N/ P = 16 max, K, G( d),, a, Redfield.,N/ P = 6., a K. Rhee [1,4 ], Hecky Kilham [18 ]. (2), N/ P,.,,. [ 19 ].,1 (N/ P = 6),,,. ( ),,.,. : [ 1 ] R HEE G Y. Phosphate uptake under nitrate limitation by Scenedesmus sp. and it s ecological implications [ J ]. J Phycol, 1974, 10 : [ 2 ] HOD GKISS I J, HO K C. Are changes in N : P ratios in coastal waters t he key to increased red tide blooms[j ]. Hydrobiologia,1997,352 : [ 3 ] HOWAR T H R W. An assessment of human influences on input s of nitrogen to t he est uaries and continental shelves of t he nort h Atlantic Ocean[J ]. Nutrient Cycling in Agroecosystems,1998,52 : [ 4 ] R HEE G Y. Effect s of N : P atomic ratios and nitrate limitation on algal growt h, cell composition and nitrate uptake[j ]. Limnol Oceanogr, 1978,23 : [ 5 ] T P, 1,. [ M]. :, [ 6 ] GB : [ S]. [ 7 ],,, 1 : [J ].,1994,15 (3) : [ 8 ],. [ M ]. :, [ 9 ] DAVIS C O. The Importance of Understanding Phytoplankton Life Strategies in t he Design of Enclosure Experiment s [ M ]. SpringΟ Verlag : Marine Mesocosnis, [ 10 ] PRA T T C M. Competiton between Skeletonma costatum and Olist hedisus luteus in Narraaganesett Bay and in culture [J ]. Limnol

6 Oceanogr, 1996, 11 :447. [ 11 ] REYNOLDS C S. The Ecology of Freshwater Phytoplankton[ M]. London :Cambridge University Press, [ 12 ],,. [J ].,1998, 22 (1) : [ 13 ],,. 1. [J ].,2001,3 (33) : [ 14 ],,,. [J ].,1989,11 : [ 15 ],,,. [J ].,2002,1 (2) : [ 16 ],,. [J ].,1998,17 (3) : [ 17 ],., a [J ].,1994,16 (1) : [ 18 ] HECKY R E, KIL HAM P. Nutrient limitation of phytoplankton in freshwater and marine environment s : effect so fenrichment [J ]. Liminology and Oceanography,1988,33 (4) : [ 19 ],,,. [J ].,1997,28 (1) : Influence of N/ P ratio on the growth and competition of t wo red tide algae KAN G Yan2yu 1,2,L IAN G J un2rong 1, GAO Ya2hui 1,L IN Rong2cheng 3, GAO Hua 1, XIN G Xiao2li 1,MA Jie 1,L UO Qiao2qi 1 (1. S chool of L i f e S ciences, X iamen Universit y, X iamen , China; 2. X iamen I ns pection and Testing Center of A g ricultural Product Quantit y and S ecurit y, X iamen A g ricuture A dminist ration, X iamen , China;3. of Oceanog ra phy, S tate Oceanic A dminist ration, X iamen , Chi na) Thi rd I nstitute Abstract : The growt h and species co mpetitio n of t wo red tide species T hal assiosi ra pseu donana and Gy m nodi ni um sp. were st udied under different N/ P ratio, and t he algal batch cult ure experiment s was conducted. The p hysiological and biochemical indexes were measured periodically,including max, K, G(d) and ChlΟa. The result s showed t hat when t he N/ P ratio was 16 1, t he max, K and ChlΟa of T hal assiosi ra pseu donana were all t he highest,and G( d) was the shortest. This implied t hat t he optimal N/ P ratio of T hal assiosi ra pseu donana is When t he N/ P ratio was 6 1,t he max, K and ChlΟa of Gy m nodi ni um sp. were the highest,and G(d) were t he shortest, so t he optimal N/ P ratio of Gy m nodi ni um sp. is 6 1. From t he growt h curves as indicated bot h in cell density and ChlΟa, it is suggested t hat the effect of N/ P ratio on ChlΟa and cell density are almost t he same. Different N/ P ratios had weak influence on succession of co mmunit y of algae and t he co mpetitio n bet ween t he t wo algae. Gy m nodi ni um sp. may use t he p hosp horus in vivo for growt h, so it is important to pay attention to t he concealment of p hosp horus, in order to avoid t he outbreak of red tide. Based on t he importance of nitrogen and p hosp horus and it s ratio, t he possible out break mechanism of red tide was also discussed in this paper. Key words : N/ P ratio ; T hal assiosi ra pseu donana ; Gy m nodi ni um sp. ; red tide

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