广西北部湾海域初级生产力与环境因子相关关系研究

海洋初级生产力（ocean primary productivity，OPP）是评估海洋生态的重要依据，对海洋资源的开发与管理具有重要意义。本研究基于2017年北部湾近岸海域水质监测数据与MODIS海洋水色数据，构建VGPM模型估算广西北部湾海域海洋初级生产力。根据模型估算结果，分析了该海域2017年OPP的时空变化特征与影响OPP的环境因子相关性。结果表明，北部湾海域OPP呈现出冬、春季高和夏、秋季低的时间特征，近岸高、远岸低的空间特征；月平均OPP最高值出现在12月，为2196.23 mg C/(m2/d）；最低值出现在8月，为693.73 mg C/(m2/d）；OPP与光合有效辐射、海表温度呈负相关关系，与盐度呈正相关关系；营养盐相关性分析表明北部湾海域浮游植物生长对亚硝酸盐的需求不高，对正磷酸盐的需求较为明显。

A study on the correlation between primary productivity and environmental factors in Guangxi Beibu Gulf

The ocean primary productivity (OPP) is a great basis for ocean ecology assessment, which qualify important significance for ocean resources exploitation. Based on Vertically Generalized Production Model(VGPM), the primary productivity in the Beibu Gulf, China, was estimated using the MODIS ocean color products and in-site water monitoring data. Temporal and spatial variation characteristics and correlation of environmental factors which impact the OPP in the mechanism of phytoplankton growing was given in this study. The result indicated a higher OPP in spring and winter, and lower OPP in summer and autumn of the whole year; and the OPP was higher in the nearshore compared with the offshore. The average OPP showed a peak in December as 2196.23 mg C/(m2/d) and a trough in August as 693.73 mg C/(m2/d); OPP is negatively correlated with photosynthetically active radiation (PAR) and SST, and positively correlated with sea surface salinity (SSS). And the study about the effect of nutrients on primary productivity shows the demand for nitrite is not high for phytoplankton in Beibu gulf, while orthophosphate is more obvious.