湛江湾真光层深度与初级生产力的时空变化及其影响因素

Spatiotemporal variations and influencing factors of euphotic depth and primary productivity in the Zhanjiang Bay

基于2016-2017年4个季节航次数据,分析了湛江湾真光层深度与初级生产力的时空变化特征及其影响因素。结果表明,湛江湾真光层深度平均值为(6.95±3.17)m,空间变化比季节变化明显,K_(d)(PAR)与浊度存在显著的正相关关系,建立的线性回归模型R为0.73(p<0.01),表明悬浮颗粒物对湛江湾真光层深度的影响占主导地位。利用VGPM模型得到初级生产力(以碳计)的平均值为(639.53±427.95)mg/(m^(2)·d),其时空特征与真光层深度基本保持一致,真光层深度比叶绿素a浓度更能解释初级生产力的时空分布模式。

The temporal and spatial variation characteristics and influencing factors of euphotic depth and primary productivity in the Zhanjiang Bay were studied by applying voyage data of four seasons from 2016 to 2017.The results showed that the average value of euphotic depth was(6.95±3.17)m,and the spatial variations were more obvious than the seasonal variations.There was a significant positive correlation between K_(d)(PAR)and turbidity,as the R^(2)of established linear regression model was 0.73(p<0.01),indicating that suspended particles on euphotic depth was the dominant attenuation factor in the Zhanjiang Bay.The average value of primary productivity obtained by VGPM model was(639.53±427.95)mg/(m^(2)·d),and its temporal and spatial characteristics were basically consistent with euphotic depth,which mean euphotic depth explained the temporal and spatial distribution pattern of primary productivity better than chlorophyll a concentration.