本文利用碳酸盐岩风化剖面土壤中Rb/Sr值、有机碳氮的稳定同位素值(delta~(13)C_(org)和delta~(15)N_(org))并结合~(14)C定年结果,讨论了贵州黔西南喀斯特地区晚更新世以来的植被和气候变化情况。结果表明:(1)晚更新世以来,研究区气候在千年尺度上经历了多个冷热、干湿循环过程,植被以C4植物为主;(2)研究区在14 750 a BP时期可能发生过较为极端的气候事件;(3)Rb/Sr值和delta~(13)C_(org)值可以用来指示古环境变化情况,高Rb/Sr值和高delta~(13)C_(org)值指示湿热气候,低Rb/Sr值和低delta~(13)C_(org)值指示干冷气候。
英文摘要:
In this paper, Rb/Sr ratio, organic carbon and nitrogen isotope(delta~(13)C_(org) and delta~(15)N_(org))and ~(14)C dating results in two red soil profiles (ND and YK) were used to discuss vegetation and climate change since late Pleistocene at Southwest Guizhou. The results show that: (1) Since the late pleistocene, the climate of the study area has experienced several cold-hot and dry-humid cycle processes at the millennium scale, and the plants are mainly C4 plants. (2) There may have been more extreme weather events in the research area of 14 750 a. (3) The Rb/Sr ratio and delta~(13)C_(org) values can be used to reconstruct the environmental changes in the region of the ancient soil. The high Rb/Sr ratio and the high delta~(13)C_(org) indicate the hot-humid climate, low Rb/Sr ratio and low delta~(13)C_(org) indicate the dry-cold climate.