氮、磷对大亚湾大鹏澳海区浮游植物群落的影响 Ⅱ种类组成  

Influence of nitrogen and phosphorus on phytoplankton community structure in the Dapeng'ao Bay, Daya Bay: Ⅱ Species composition

作　　者：朱艾嘉[1,2] 黄良民[1] 林秋艳[1] 许战洲[1,2] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境动力学重点实验室,广东广州510301 [2]中国科学院研究生院,北京100039

出　　处：《热带海洋学报》2009年第6期103-111,共9页Journal of Tropical Oceanography

基　　金：国家"973"项目(2001CB409707);国家自然科学基金项目(40229008;40531006);广东省重大科技专项(A3050301;2005A30501001)

摘　　要：根据2005年4—5月(春季)、8月(夏季)和11月(秋季)对大亚湾大鹏澳海区表层的现场调查结合营养盐加富实验,探讨了不同季节氮(NO-3或脲氮(urea))和无机磷(PO34-)营养元素对浮游植物种类组成的潜在影响。大鹏澳海区浮游植物优势种有明显季节变化,秋季种类组成的平面变化最明显。春季浮游植物平均细胞密度最高但多样性指数最低。实验结果显示,春季至夏季浮游植物优势种翼根管藻模式变型Rhizosolenia alata f.genuina、丹麦细柱藻Leptocylindrus danicus和绕孢角毛藻Chaetoceros cinctus之间的演替可能受氮、磷条件变化的控制。夏季优势种菱形海线藻Thalassionema nitzschioides和威氏海链藻Thalassiosira weissflogii之间的演替可能受营养条件外的因素控制。尽管磷被认为是该海区浮游植物生长的主要限制因子,但夏季无机氮磷比值较高的实验组中未出现磷限制现象,无机氮磷比值的变化对浮游植物种类组成也没有显著影响,而秋季氮对浮游植物种类组成有较明显的潜在影响。In situ survey in the surface water of the Dapeng＇ao Bay （inside of the Daya Bay） , combined with nutrient enrichment bioassays, were conducted in April-May （spring）, August （summer） and November （autumn）, 2005 in order to better understand the potential influence of nitrogen （NO~ or urea） and phosphate （PO]-） on the species composition of phytoplankton in this area in different seasons. In spring, the abundance of phytoplankton in the Dapeng＇ao Bay was the highest but the diversity index was the lowest among the three seasons. The dominant species had significant seasonal variations. The horizontal variation of species composition was more significant in autumn than that in any other season. Results showed that the succession among the dominant species Rhizosolenia alata f. genuina, Leptocylindrus danicus and Chaetoceros cinctus from spring to summer may be due to the change of the condition of nitrogen （N） and PO4^3-. In summer, there should be factors other than N or PO4^3- controlling the succession between the dominant species Thalassionema nitzschioides and Thalassiosira weissflogii. Although phosphorus （P） is considered to be the most limiting factor for the growth of phytoplankton in this area, the treatment with high N＇P ratio in summer did not show any P limiting effect, and the variation of N.＇P ratio had little effect on the species composition. Furthermore, the potential impact of N on the species composition was more significant than that of PO4^3- in autumn.

关 键 词：大亚湾大鹏澳 浮游植物 种类组成 氮 磷 

分 类 号：X171.1[环境科学与工程—环境科学]