万象洞方解石沉积δ13C对洞穴上覆植被土壤同位素信号的继承关系研究

Stalagmite records application in palaeo-climate research must be on the premise of the cave system δ13C signal monitoring work. In this study, plants and soil samples were sampled and δ13C value were analysised, combined with the local precipitation and air temperature data, the mechanism of plants and soil δ13C response to climate factor, and the palaeo-climate, palaeo-environmenet meaning of stalagmite δ13C records from Wanxiang Cave were discussed. The results showed that negative shift of the plants and soil δ13C values indicated more precipitation; No significant relationships between calcite δ13C and the temperature of deposition environment; a significant positive relationship between plants, soil δ13C and elevation were observed, the higher the elevation, the more positive the plants and soil δ13C value; δ13C signal was well succeeded through the plants-soil-calcite deposition system, indicated that variations of plants and soil caused by climate can be recorded by stalagmite δ13C during its growth period, the lower the plants land cover under the bad habitat and the higher the water use efficiency lead by drought, the more positive the stalagmite δ13C, vice versa.