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Plankton respiration is an important part of the carbon cycle and significantly affects the balance of autotrophic assimilation and heterotrophic production in oceanic ecosystems. In the present study, respiration rates of the euphotic zone plankton community(CR_(eu)), size fractionated chlorophyll a concentration(Chl a), bacterial abundance(BAC), and dissolved oxygen concentration(DO) were investigated during winter and summer in the northern South China Sea(n SCS). The results show that there were obvious spatial and temporal variations in CR_(eu) in the n SCS(ranging from 0.03 to 1.10 μmol/(L·h)), CR_(eu) in winter((0.53±0.27) μmol/(L·h)) was two times higher than that in summer((0.26±0.20) μmol/(L·h)), and decreased gradually from the coastal zone to the open sea. The distribution of CR_(eu) was affected by coupled physical-chemical-biological processes, driven by monsoon events. The results also show that CR_(eu) was positively correlated with Chl a, BAC, and DO, and that BAC contributed the highest CR_(eu) variability. Furthermore, the results of the stepwise multiple linear regression suggest that bacteria and phytoplankton were the dominant factors in determining CR_(eu)(R~2 = 0.82, p0.05) in the n SCS. Based on this relationship, we estimated the integrated water column respiration rate(CRint) within 100 m of the investigated area, and found that the relationship between the biomass of the plankton community and respiration may be nonlinear in the water column.  相似文献   
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本文通过南海北部冬、夏季航次的现场观测,研究了海表浮游植物光合作用速率对光强的响应特征(P-E曲线)。结果表明南海北部浮游植物P-E曲线存在明显的季节变化。在冬季,P-E曲线呈现高PmB、高α、高β的特征,这表明冬季浮游植物在低光照环境中光合作用速率增加迅速,其最大光合作用速率较高但容易受到光抑制。与冬季相反,夏季P-E曲线呈现低PmB、低α、低β的特征,浮游植物受光抑制影响小,但最大光合作用速率低于冬季。水温和粒级结构等指标与P-E参数存在显著相关,这意味着环境和群落的季节变化可能对光合作用特性有一定影响。通过P-E参数模拟得到真光层内光合作用速率,模拟值与现场结果之间呈明显的线性相关但存在高估。此研究有助于认识南海浮游植物光合作用特征,并为初级生产力模型研究提供依据。  相似文献   
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合理的人工鱼礁布局可以为海洋生物提供适宜的生境,促进物种的多样性和生态系统的稳定。然而受多种因素的影响,人工鱼礁投放的实际位置与规划方案多有差异,致使人工鱼礁建设达不到预期效果。文章利用重心误差、外围面积误差、重叠面积误差以及礁体数量误差等4个指标来评价天津海洋牧场人工鱼礁的投放误差状况。结果表明,天津海洋牧场人工鱼礁投放的外围面积误差和礁体数量误差的平均值分别为-0.11和0.067,投放布局的准确性比较高;重心和重叠面积误差平均值分别为0.59和0.73,投放定位的准确性相对较差,需要进一步改进;从年际变化来看,2018年人工鱼礁投放的重心误差、重叠面积误差、礁体数量误差均有明显改善,仅外围面积误差略大,表明随着时间的推移,人工鱼礁投放布局和定位的准确性均已达到预期效果。文章量化了天津海洋牧场人工鱼礁的投放误差,成果可为提高天津海洋牧场人工鱼礁投放效果提供有益参考,为相关政策制定提供科学依据,并指导管理实践。  相似文献   
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