Decadal-scale variations of ecosystem productivity and control mechanisms in the Bohai Sea
Decadal-scale variations of ecosystem productivity and control mechanisms in the Bohai Sea
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DOI：
10.1046/j.1365-2419.2003.00251.x
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发表时间：
2003-09
影响因子：
2.6
通讯作者：
Q. Tang;Xian-shi Jin;Jun Wang;Zhimeng Zhuang;Yi Cui;Tian-ya Meng
中科院分区：
文献类型：
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作者：
Q. Tang;Xian-shi Jin;Jun Wang;Zhimeng Zhuang;Yi Cui;Tian-ya Meng
利用1959-60、1982-83、1992-93和1998-99年的调查资料，描述了渤海生态系统生产力的年代际变化。采用叶绿素a浓度、初级生产力、浮游植物丰度、浮游动物生物量和渔业生物量等指标来描述不同营养级的生态系统生产力。在过去的40年中，渤海生态系统的生产力和群落结构一直高度可变。初级生产力和鱼类生产力从1959年到1998年呈下降趋势，1992年和1998年浮游植物丰度约为1959年和1982年的38%，1998年渔业生物量特别低，仅为1959年的5%左右。浮游动物次级生产力在1959 - 1992年也呈下降趋势，但在1998年达到较高水平，约为1959年和1982年的3倍，1992年的4倍。这些结果表明，生态系统生产力的大幅度变化是海岸带生态系统动力学的重要特征之一。因此，不可能用单一的理论来解释渤海生态系统变化的原因，因为生产力的变化可能是由多种机制强迫和/或调节的。
Decadal-scale variations of ecosystem productivity in the Bohai Sea are described by using the survey data of 1959–60, 1982–83, 1992–93 and 1998–99. Indices including chlorophyll a concentration, primary production, phytoplankton abundance, zooplankton biomass and fishery biomass were used to describe the ecosystem productivity at different trophic levels. During the past four decades, the productivity and community structure of the Bohai Sea ecosystem has been highly variable. Primary productivity and fish productivity decreased from 1959 to 1998, such that phytoplankton abundance in 1992 and 1998 was about 38% of that in 1959 and 1982, fishery biomass in 1998 was particularly low, which was only about 5% of that in 1959. Zooplankton secondary productivity also showed a decreasing trend from 1959 to 1992, but reached high levels in 1998, about three times as much as 1959 and 1982, and four times as much as 1992. These results indicate that a large variation in ecosystem productivity is one of the important characteristics of coastal ecosystem dynamics. Therefore, it is impossible to apply a single theory to explain the causes of variations in the Bohai Sea ecosystem as the changes in productivity are likely to be forced and/or modulated by multiple mechanisms.