摘要
于1992年9月—1994年5月先后对快山湾海域作了7个航次调查。由实验室培养试验和现场采样分析两种方法得出食物链一个营养级的13C富集度分别为（1．6±0．2）×10-3和1．7×10’，两者几乎一致。由7个季度月的现场采集样品的同位素分析结果表明，从处在食物网底部的浮游植物到最高级的肉食性鱼类之间13C差值平均为6．9×10-3，相当于5个营养级；并由各类生物的碳同位素数据分别确定了它们在该食物网中的营养位置，其结果与食性分析方法所得结果基本吻合。同位素示踪方法研究的结果还表明，崂山湾水体生物食物网中碳的来源主要是浮游植物碳。
Seven cruise investigations were conducted in Laoshan Bay from September 1992 to mp 1994 to study the trophic relations in pelagic food webs in Inoshan Bay ecosystem using a stabe isotopic tracer. The 13C enrichment fastors per trophic level in the food chain are (1.6±0.2) ×10-3 and 1.7×10-3 with two metheds for laboratorial culturc tests and in situ sampling analyses,respectively, showing both are almost idenhcal' The results of isotopic analyses of in situ samples in seven chases indicare tha the mean of 13C value difference between phytoplankton at the bottom of the food webs and cdrivorous fishes at the top level is 6.9×10-3, conesponding to 5 trophic levels,and their trophic locations in the food webs are detendned for every species based on their 13C values. Ths result is basically coincident with tha by the feeding habit analyses. Compared with the results of isotopic research in other marine ecosystems in the worid, the conunonnss is tha the 13C value distributions of vallous species of orgedsms reflect the carbon isotoPc enrichmnt exishng in food webs and there is som similarity in different ecosystems. The difference is that based on the measarements of seven months seasonally the samples collected from Laoshan Bay also reflect the seasonal variations in 13C value distributions. The results in most references, however,have only data of one chase; it is difficult to reflect the seasonal vdriations. Moreover, the differences of geographic positions,especially latitud, also have a large effect on 13C values. The results of the isotopic beer research show tha the preddrinant somee of carbo of pelagic food webs in Laoshan Bay is phytoplankton-derived carbon, while other carbo soarees, such as the organic matter derived from termstial clastic and the organic matter in the bottom sediments, are secondary sources.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1999年第6期671-678,共8页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金!39170172
