CAJ | 학술논문

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.
대남해남부25개표층침적양진행료생물규적측정분석,시도게시남해남부표층침적생물규적분포급기대현대해양배경적지시의의,이편위고해양학연구제공진일보적과학의거.연구발현,표층침적물중생물규함량여기소처수심정현저정상관관계,상관계수체도0.782.륙가천수구표층침적물중생물규함량비상저,불능반영표층수체중규질생물생산력정황,저가능여침적류형화륙원물질수입영향유관.심수구표층침적물중생물규적함량분포표명,기불부능반영출표층수체중규질생물적고생산력수평,이차환능지시상승류적강약,종이진일보증실료이용침적물중생물규함량래추종상승류발육화변화적유효성여가신도.연구결과환현시,재연구구역중북부표층침적생물규중방사충화해면골침교규조점유경대적비중,저가능시유우규조역피용해병역피기타생물체섭식적연고.재유상승류발육적해역,방사충、규조화해면골침기본상균표현출교고적봉도,저여고적생물규함량상일치.
Biogenic silica content was determined in 25 surface sediment samples from the southern South China Sea to study its distribution and its modern oceanic environmental significance, which may provide further scientific evidence for paleoceanography explaination. This study showed that biogenic silica content in surface sediments and its water depth have evidently positive correlation, and the correlation coefficient was up to 0.782. Biogenic silica content was very low in continental shelf shallows and could not reflect the productivity of siliceous micropaleontology in surface waters, which may be affected by sedimentary types and terrigenous matter dilution. Distribution of biogenic silica content in surface sediments from deep water areas showed that it could not only reflect the paleoproductivity of siliceous micropaleontology in surface waters, but also indicate the strong or feeble upwelling. Thus, it was further confirmed that using biogenic silica content in sediments to trace upwelling and its change was effective and reliable. The analyzed result showed that radiolaria and poriferous specula have more contribution for biogenic opal, comparing with diatom in surface sediments from the northern studied area, probably owing to the diatom dissolved easily away and eaten by other organisms with little effort. In the upwelling areas, radiolarian, diatom and poriferous specula all approximately showed high abundance, which was consistent with high biogenic silica content.