东、黄海生源要素的埋藏通量及其时空分布特征

通过对东、黄海海域2006年4月、10月航次的调查,结合210Pb数据,测定了4个站位200余年来沉积物中生源要素(总氮、总磷、总有机碳)的埋藏通量。从时间分布特征可以看出, 4个站位中,总氮(TN)的埋藏通量均自底层向表层逐步上升,到上个世纪五、六十年代左右达到较大值后便呈波动下降趋势;总磷(TP)在各站位的埋藏通量的变化比较稳定,几乎没有明显的峰值,均自底层到表层逐渐降低。总有机碳(TOC)的埋藏通量自底层到表层逐步升高,其中10594,10694站位在上世纪六十年代左右均出现了最高值,12694及H1-18站位在上世纪四十年代出现了相对高值,而后便呈下降趋势;从生源要素埋藏通量的空间分布特征可以看出,南黄海各生源要素埋藏通量的平均值分布可能与黑潮流系的影响强弱不同有关,即黑潮流系影响越强初级生产力越弱,生源要素埋藏通量越低,反之则越高;而H1-18站位生源要素的埋藏通量变化特点较为复杂,原因可能与其所处海域水文条件复杂,受陆源影响较大有关。

The spatial and temporal distribution of the biogenic elements sedimentation flux in the East China Sea and the Yellow Sea

Core sediment samples named 10594, 10694, 12694, H1-18 were collected during cruises in the East China Sea and the Yellow Sea in April and October of 2006, combining with the results of the210Pb dating to the biogenic elements (total nitrogen、total phosphorus、total organic carbon)of about lated 200 years.The vertical distribution profiles revealed that the total nitrogen(TN) content in the four stations was relatively similar, from deep to shallow layer the contents of TN showed the extended tendency, till the depth about 50、60 era of 20th century the highest value was found and then showed waving downward trend; The vertical distribution of total phosphorus(TP) in the four stations revealed stable extended tendency and there was no highest points from deep to shallow layer; the contents of total organic carbon (TOC)showed the upward trend from deep to shallow layer, the highest content was found in the station 10594, 10694 at about 60 era of 20th century, as well as, the highest content were found at station12694, H1-18 at about 40 era of 20th century and then the contents of TOC reduced; The results showed that the mean value of biogenic elements content of surface sediments was governed by the kuroshio, for the reason that the productivity of the kuroshio was lower than the other area of the Yellow Sea and the content of biogenic elements was lower.However, in the station H1-18 the content of biogenic elements was complex, which may be caused by the complicated hydrologic conditions and continental input matter around the area.