闽南－台湾浅滩渔场N／P比值的空间分布

１９８７年１２月—１９８８年１１月对闽南－台湾浅滩渔场上升流生态系进行了调查研究。研究结果表明，本研究海区的海水Ｎ／Ｐ比值的空间分布与水团的分布具有密切的关系。各水团的Ｎ／Ｐ比值不遵守Ｒｅｄｆｉｅｌｄ常数１５：１，并且在水团间存在一定的差别。在研究水团的分布及划分中，Ｎ／Ｐ比值可作一较好的参考值。闽浙沿岸水、次表层水和中深层水的Ｎ／Ｐ比值大于１５；海峡南部混合水、海峡暖水、夏季近岸涌升水和浅滩南部涌升水的Ｎ／Ｐ比值小于１５。前者主要是入海径流及有机体的充分分解所致，后者则为浮游植物对ＮＯ３－Ｎ和ＰＯ４－Ｐ的大量吸收及ＮＯ３－Ｎ和ＰＯ４－Ｐ再生速率上差异的结果。本文还讨论了水团的分布对营养盐和叶绿素分布的影响。

SPATIAL DISTRIBUTION OF N/P RATIO IN THE SOUTHERN FUJIAN-TAIWAN BANK FISHING GROUND

In this Paper the spatial distribution of N/P ratio in the southern Fujian-Taiwan Bank fishing ground in spring (April), summer (July), autumn (November) and winter (December) are discussed based on the survey of upwelling ecosystem in this area from December 1987 to November 1988. The results showed that in the survey area, spatial distribution of N/P ratio in sea water related to that of water masses. N/P ratio in water masses did not abide by Redfield constant 15: 1, and obvious differences of the ratios existed between various water masses. N/P ratio can be used for a good reference value in studying distribution and division on water masses. N/P ratio in the Fujian-Zhejiang coastal water, the subsurface water and the mid-water were higher than 15; while that in the bank upwelling water, the nearshore upwelling water, the warm water and the mixing water of Taiwan Strait were less than 15. The former mainly resulted from the runoff into the sea and full decomposition of plankton ; the latter resulted from the phytoplankton absorption of nutrient and difference of regenerate rate of nitrate and phosphate. The effects on distributions of nutrient and chlorophyll by water masses are also discussed.