山东近岸黄海海域初级生产力的时空分布变化研究

于2006年8月(夏季)、2006年12月(冬季)、2007年4月(春季)、2007年10月(秋季)对山东黄海近岸初级生产力的分布进行了4个航次的调查,并对其时空分布特征进行了分析.结果显示:(1) 调查海域春、夏、秋、冬4个航次的初级生产力平均值分别为808.798,372.23,324.717和246.146 mg·m-2·d-1,春季的初级生产力最高,冬季的最低.(2) 春、夏、秋季初级生产力的变化在水平方向上总体呈现出近岸高于远岸的分布特征,而冬季的变化趋势正好相反;在垂直分布上,4个航次初级生产力均以相对海平面光强30%～10%的水层为最高,其中夏季初级生产力分层现象明显,春、秋、冬季各水层间的差异不显著.(3) 环境因子的变化对初级生产力的作用不同,利用同化指数法求得的初级生产力比14C同位素示踪法测得的数值高出1～70倍.

The Spatial and Temporal Distribution of Primary Production in the Yellow Sea Nearshore Area of Shandong Province

The annual distribution characteristics of primary production in the Yellow Sea nearshore area of Shandong Province were investigated during August 2006(summer), December 2006(winter), April 2007(spring) and October 2007(Autumn). The results showed that: (1) The average primary production concentration of the investigated area in spring, summer, autumn and winter was 33.704 mg·m-2·h-1, 15.51 mg·m-2·h-1, 13.531 mg·m-2·h-1 and 10.231 mg·m-2·h-1, respectively, and an obvious tread of spring＞summer＞autumn＞winter was obtained. (2) The horizontal distribution of primary production concentration in the investigated area presented higher values in the coast but the concentration decreased gradually in the off-lying sea in spring, summer and autumn, while winter showed just the the opposite regularity. The aqueous layer that had a relative light intensity of 30%～10% of the sea surface had the highest primary production all the year around as compared to the other layers in the vertical distribution. The delamination of primary production was obvious in summer but little difference was observed in spring ,autumn and winter. Environmental factors, including biotic and abiotic factors exerted different effects on the seasonal variation of primary production. Moreover, the primary production analyzed by the assimilation index method was 1～70 times higher than that by the 14C isotope tracer method.