| 摘要: |
| 菜州湾是中国北方重要的渔业和养殖基地，是中国对虾索饵和产卵的传统海域。初级生产力反映海域自养浮游生物通过光合作用生产有机碳的能力，是水域肥瘠程度和可养育生物资源的直接指标。初级生产力中的重要部分——新生产力，是外源营养盐输入从而导致浮游植物生物量增加的那部分生产力，也是在维持真光层群落生态平衡的基础上可向系统外输出的生产力；而且由于新生产力是向更高层次营养级的净输出，所以其提供了评价次级和更高级营养阶层生物可持续生产的依据。
20世纪80年代初，有许多学者就开展了渤海叶绿素a和初级生产力的研究，菜州湾是其观测海域的重要组成部分。观测结果表明，菜州湾为渤海的高生物量和高生产力区(费尊乐等，1988；费尊乐等，1991；吕瑞华等，1992;朱明远等，1993；吕瑞华等，1999)，但未见莱州湾海域的专题研究报道，新生产力的研究尚属空白。
本研究采用14C和15N同位素示踪法，在莱州湾进行了初级生产力和新生产力的现场实验研究，获得了比较系统的观测资料，可为评估菜州湾生物资源潜力和可持续利用能力，为菜州湾渔业和养殖业的发展提供科学依据。 |
| 关键词: 叶绿素a 初级生产力 新生产力 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金重大项目，497901001号。 |
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| SIZE-FRACTIONATED CHLOROPHYLL A, PRIMARY PRODUCTION AND NEW PRODUCTION IN LAIZHOU BAY, BOHAI SEA, CHINA |
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Cai Yuming1, Ning Xiuren2, Liu Zilin1, Liu Chenggang1
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1.Second Institute of Oceanography, State Oceanic Administation;2.Key Laboratory of Ocean Dynamic Processes & Satellite Oceanography, SOA
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| Abstract: |
| The distribution of chlorophyll a (ChL.a) concentration, primary production and new production were observed in Laizhou Bay of Bohai Sea in spring and neap tides during July 1997. The results showed that there were marked features of spatial zonation in the surveyed area, due to the differences between the geographic environment and the hydrological conditions. Chl. a, primary production and new production were all higher in spring tide than in neap tide in Laizhou Bay. The highest values of these parameters were encountered in the central coastal regions of the Bay. In most stations. Chl. a concentrations at the bottom were higher than that at the surface. The results of size-fractionated Chl. a and primary production showed that contributions of nano-plus pico-plankton (<20 μm) to total Chl. a and primary production were in dominant position in the phyto-plankton community biomass and production of Laizhou Bay. The major sources of nitrate of Laizhou Bay were terrestrial input and resuspension of the sediments in the estuary area. The environmental factors, governing primary production and new production in this sea area are discussed and comparisons of primary production and new production between spring tide and neap tide Laizhou Bay and other sea areas are also given. |
| Key words: chlorophyll a primary production new production |
