南海陆坡沉积磷对古气候和环境变化的指示

In global change research, it is suggested that the biogeochemical process of elements played an important role in leading to paleoclimate and paieoenvironment changes. The information about different time-scale global changes was attained by studying the lake sediments, ice cores, biogenic remains in marine sediments, annual ring of trees, peat coal sediments and cave carbonates. Because the directive geological records on the relationship between nutrient elements and environment was revealed but litter, the evidences about the biogeochemical process of nutrient elements effected on the global climate changes are lack. Two sediment columns were collected from the north continental shelf of the South China Sea. The sedimentary phosphorus and its forms as well as Fe, Mn, Al, Mg, K, Na. Cu, Pb and Zn etc in sediment columns were researched. The results show that: (1) the reduction of phosphorus and the increase of calcium carbonate in oceanic sediment may be a key factor to glacial atmospheric CO2 decline; (2) the variation of Fe-P content in sediment can reflect sensitively paleoclimate changes;(3) the acid-dissolved Fe, Mn, K, Na, Al, Mg in sediment were corresponding to the paleoclimate and paleoenvironment changes; (4) the relative content ratios of Cu, Pb, Zn in sediment column are stability. These results not only provide new knowledge for bringing to light the cause of glacial atmospheric CO2 decline, but also open now ways for studying the environmental substitutive indexes of global changes.

通过研究采自中国南海陆坡沉积柱样中的磷随时间的变化, 结合其他环境指标, 高分辨侍崛〖锹荚诔粱字?的东亚季风区三万年来气候和环境变化的信息, 并通过与陆地沉积锛吐嫉墓呕肪承畔⒌亩员群陀肴虮浠亩杂叵笛芯? 探讨用沉积磷指示过去环境变化的敏感性和实际意义。这在研究过去全球变化的地球化学指标方面, 具有创新意义..