A Preliminary Assessment of the Nutritive Value of the Sediment across the Continental Shelf North Off Taiwan

橫跨臺灣北部海域大陸棚之沈積物養分之初探研究

程一駿(I-Jiunn Cheng) ； 蔡政翰(Cheng-Han Tsai)

《臺灣水產學會刊》 21卷4期 (1994/12) Pp. 323-338

https://doi.org/10.29822/JFST.199412.0003

摘要

從橫跨臺灣北部海域大陸棚及陸坡上取10個測站，測量沈積物中之底棲大型動物之群落組成、顆粒特性以及化學性質。根據沈積物之顆粒大小之分佈，我們可以將研究區分成陸棚內側及陸坡上層之高有機質含量、低水文能量之沈積區，陸棚內側之低有機質含量、高水文能量之非沈積區，以及陸棚中部細砂及泥質混合之較低水文能量的混合區。沈積物之總有機質含量與細砂含量間存在一正向關係，而沈積物之碳和氮比例隨著有機氮含量之增加而減少。大型底棲動物之密度及種類豐富度以陸棚外側之可利用蛋白質含量的地區最高。從地區性的水文環境的判斷，我們提出了一個只有由終年性的湧升流所形成的强烈底棲—浮游聯結，方能解釋大量底棲群落聚集於顆粒粗之非沈積環境中的現象。

關鍵字

沈積環境 ； 大型底樓動物群集 ； 有機養分 ； 總有機質 ； 可利用蛋白質含量 ； 底樓－浮游聯結

並列摘要

Sediments from 10 stations across the continental shelf north off Taiwan were sampled, and their macrobenthos assemblages, physical characteristics, and chemical properties were studied. Based on the grain size distribution, the study area was divided into 1) the inner shelf and upper slope of high organic contents low energetic depositional environment, 2) the outer shelf of low organic contents but high energetic, non-depositional environment, and 3) the middle shelf of fine sand and mud dominated, mild energetic, mixed environment. There was a positive relationship between the organic contents and the fine grain contents of the sediments. The C: N ratio increased with the decrease in organic nitrogen contents. Both the macrobenthos density and the number of species were found to be higher in the outer shelf region where the sediment contained high bioavail able protein. According to the local hydrodynamic environment, benthic-pelagic coupling resulted from a year-roundup welling is apparently the major cause of large macrobenthos assemblages in the coarse grain, non-depositional sediments in the outer shelf region.

並列關鍵字

Sedimentary environment ； Macrobenthos assemblages ； Organic nutrients ； Total organic matter ； Bioavailable protein contents ； Benthic-pelagic coupling