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海洋浮游生态系统中小型浮游动物的生态功能

期刊名称：地球科学进展 2009 ，24(11):1195-1201
时间：0
分类：Q178.53[生物学—水生生物学;生物学—普通生物学]
作者机构：[1]卫星海洋环境动力学国家重点实验室,浙江杭州310012, [2]国家海洋局第二海洋研究所,浙江杭州310012, [3]国家海洋局海洋生态系统与生物地球化学重点实验室,浙江杭州310012, [4]浙江省海洋水产养殖研究所,浙江温州325005, [5]天津农学院水产学院,天津300384
相关基金：国家自然科学基金（91128212,90711006）; 全球变化和海气相互作用专项（GASI 03-01-03-02,GASI-03-01-03-03）; 国家海洋局第二海洋研究所基本科研业务专项资金项目（JG1310）
相关项目：我国典型海域生态系统演变过程与机制

关键词：光合作用, P-E曲线, 南海北部, 浮游植物, photosynthesis, northern South China Sea, photosynthesis-irradiance curve, phytoplankton

中文摘要：

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P^Bm、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P^Bm、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。

英文摘要：

The phytoplankton photosynthesis rate is important to understand the variations of oceanic primary production（PP）.In this study,we measured sea surface photosynthesis-irradiance（P-E）parameters fromin situexperiments during summer and winter cruises,which was carried out in the northern South China Sea（nSCS）in2004.The results showed that the P-E parameters had obvious seasonal variations in the nSCS.In winter,the P-E parameters were characterized by highα,highβ,and high P^Bm.It indicated that phytoplankton could achieve relatively higher maximum photosynthesis rate,but the light-inhabitation would be significant when the light was supersaturate.In contrast to winter,the P-E parameters,α,β,and P^Bm,were relatively lower in summer,which indicated that phytoplankton favorites high photosynthetically active radiation environment,and its maximum photosynthesis rate was lower than that in winter but the light-inhabitation was very slight.We found some factors,such as temperature and size structure of phytoplankton,have significant correlation with P-E parameters.This implied that the photosynthesis rate was affected by both the seasonal changes of environment and the phytoplankton groups.The photosynthesis rate（P^Bmodel）,calculated by P-E parameters,had significant linear correlation with the in situ photosynthesis rate（P^Bin situ）which was derived by PP experiments.However,the P^Bmodelresults also showed overestimation,which was mainly due to the fact that the respiration rate could not be neglected in the P-E experiment.The results are helpful in the understanding of the characters of phytoplankton photosynthesis in the nSCS.