Spatiotemporal variations and influencing factors of euphotic depth and primary productivity in the Zhanjiang Bay
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摘要: 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，Kd(PAR)与浊度存在显著的正相关关系，建立的线性回归模型R2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/(m2·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。Abstract: 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 Kd (PAR) and turbidity, as the R2 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/(m2·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.
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Key words:
- euphotic depth /
- primary productivity /
- Kd(PAR) /
- turbidity /
- VGPM /
- Zhanjiang Bay
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图 1 湛江湾采样站位
◇（Z1−Z24）为春季和夏季采样站位；▽（S1−S21）为秋季采样站位；△（A1−A26）为冬季采样站位
Fig. 1 Sampling sites in the Zhanjiang Bay
◇(Z1−Z24) denotes the sampling site in spring and summer; ▽(S1−S21) denotes the sampling site in autumn; △(A1−A26) denotes the sampling site in winter
图 2 湛江湾真光层深度的季节和空间分布
Fig. 2 Seasonal and spatial distributions of euphotic depth in the Zhanjiang Bay
图 3 基于VGPM模型的湛江湾初级生产力的季节和空间分布
Fig. 3 Seasonal and spatial distributions of primary productivity in the Zhanjiang Bay based on VGPM model
图 4 PAR漫衰减系数（Kd）与浊度（a）、叶绿素a浓度（b）和CDOM吸收系数（c）建立的回归模型
Kd(PAR)单位：m−1；浊度单位：NTU；叶绿素a浓度单位：μg/L；CDOM吸收系数单位：m−1
Fig. 4 Regression models between photosynthetically available radiation attenuation coefficients (Kd (PAR)) and turbidity (a), Chl a concentration (b) and CDOM absorption coefficient (c)
Kd(PAR) unit: m−1; turbidity unit: NTU; Chl a concentration unit: μg/L; CDOM absorption coefficient unit: m−1
图 5 湛江湾表层叶绿素a浓度的季节和空间分布
Fig. 5 Seasonal and spatial distributions of surface Chl a concentration in the Zhanjiang Bay
图 6 4个季节各有效站位表层营养盐浓度
Fig. 6 Surface nutrient concentration of each effective station in four seasons
图 7 4个季节各有效站位N、P、Si含量之间的比值
Fig. 7 Ratio of N, P and Si contents at each effective station in four seasons
表 1 湛江湾Kd(PAR) 和Zeu的季节性变化
Tab. 1 Seasonal variations of Kd(PAR) and Zeu in the Zhanjiang Bay
调查期间（n=62） Kd(PAR)/m−1 Zeu/m 春季（n=19） 平均值 0.79±0.44 7.05±3.27 范围 0.24～2.18 2.11～16.00 夏季（n=13） 平均值 0.91±0.27 5.23±1.98 范围 0.49～1.48 3～9.32 秋季（n=11） 平均值 0.91±0.33 5.50±1.67 范围 0.50～1.74 2.65～9.13 冬季（n=19） 平均值 0.53±0.22 8.62±3.74 范围 0.29～1.06 2.8～15.5 总计 平均值 0.76±0.36 6.95±3.17 范围 0.24～2.18 2.11～16.00 
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表 2 初级生产力与不同季节真光层深度、叶绿素a浓度之间的相关系数（样本数=62）
Tab. 2 Value of correlation coefficient between primary productivity and euphotic depth and Chl a concentration during different seasons (sample number=62)
参数 春季 夏季 秋季 冬季 全年 Zeu 0.917** 0.726** 0.944** 0.968** 0.903** Chl a浓度 0.854** 0.8** 0.779** 0.15 0.519** 注：**代表p<0.01。
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表 3 初级生产力与不同季节可溶性无机氮（DIN）、
$ {{\bf {PO}}_{\bf{4}}^{{\bf{3-}}}} $ 和$ {{\bf {SiO}}_{\bf{3}}^{{\bf{2-}}}} $ 浓度之间的相关系数（样本数=60）Tab. 3 Value of correlation coefficient between primary productivity and DIN,
$ {{\bf {PO}}_{\bf{4}}^{{\bf{3-}}}} $ and$ {{\bf {SiO}}_{\bf{3}}^{{\bf{2-}}}} $ concentrations during different seasons (sample number=60)参数 春季 夏季 秋季 冬季 全年 DIN浓度 0.841** 0.836** 0.905** 0.419 0.668** $ {{\rm {PO}}_4^{3-}} $浓度 0.721** 0.727** 0.515 0.18 0.226 $ {{\rm {SiO}}_3^{2-}} $浓度 0.847** 0.758** 0.751** 0.212 0.553** 注：**代表p<0.01。
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