论文部分内容阅读
对南海南部25个表层沉积样进行了生物硅的测定分析,试图揭示南海南部表层沉积生物硅的分布及其对现代海洋环境的指示意义,以便为古海洋学研究提供进一步的科学依据。研究发现,表层沉积物中生物硅含量与其所处水深呈显著正相关关系,相关系数达到0.782。陆架浅水区表层沉积物中生物硅含量非常低,不能反映表层水体中硅质生物生产力情况,这可能与沉积类型和陆源物质输入影响有关。深水区表层沉积物中生物硅的含量分布表明,其不仅能反映出表层水体中硅质生物的古生产力水平,而且还能指示上升流的强弱,从而进一步证实了利用沉积物中生物硅含量来追踪上升流发育和变化的有效性与可信度。研究结果还显示,在研究区域中北部表层沉积生物硅中放射虫和海绵骨针较硅藻占有更大的比重,这可能是由于硅藻易被溶解并易被其他生物体摄食的缘故。在有上升流发育的海域,放射虫、硅藻和海绵骨针基本上均表现出较高的丰度,这与高的生物硅含量相一致。
Bioassay analysis of 25 surface sediments in the southern South China Sea in order to reveal the distribution of surface sedimentary biogenic silicon in the southern South China Sea and its significance to the modern marine environment in order to provide further scientific evidence for paleoceanographic studies. The study found that there was a significant positive correlation between the biogenic silicon content and the depth of water in the sediments, with a correlation coefficient of 0.782. The low content of bio-silica in the surface sediments of the shallow shelf of the shelf can not reflect the biological productivity of the siliceous organisms in the surface water, which may be related to the sedimentary types and the input of terrestrial materials. The distribution of biogenic silicon in the surface sediments in the deep water shows that it can not only reflect the paleoproductivity of siliceous organisms in the surface waters but also indicate the strength of the ascending stream. It further confirms that the use of biogenic silica in the sediments To track the validity and credibility of the upwelling development and change. The results also show that the radioactive and sponge spicules occupy a greater proportion of diatoms in the surface sedimentary biosilicon in the northern part of the study area, probably because diatoms are easily dissolved and easily ingested by other organisms. Radiated worms, diatoms and spongy scallopers showed essentially higher abundance in areas with updrafts, consistent with the high biogenic silicon content.