水土保持学报2017，Vol.31Issue(2)：151-156,6.DOI:10.13870/j.cnki.stbcxb.2017.02.026
郧西县庹家湾黄土剖面色度参数特征及其古气候重建
Chroma Characteristics and Paleoclimatic Reconstruction of the Loess-paleosol Profile at Tuojiawan in Yunxi County, Hubei Province
摘要
Abstract
Through integrated analysis of the chroma parameters,magnetic susceptibility,grain size and Rb/ Sr ratio of the Tuojiawan loess-paleosol profile in Yunxi County,the correlation between the features of chroma parameters and palaeoclimatic change in the upper reaches of Hanjiang River was revealed.The results showed that:a* was strongly positively correlated with the content of iron oxide,and the average value of a* was significantly different between loess and paleosol layers,andfollowed the order of S0 (6.34) ＞MS (5.52)＞L(5.18)＞L0 (4.98)＞L1 (4.82)＞T1-al2 (3.66).L* was negatively correlated with the content of iron oxide and organic matter,with iron oxide having a greater effect on L*,which reached the peak in the loess layers.h* was the lowest (68.64°)in the paleosol layers,but was high in the loess layers.In contrast,a*/b* was high in the paleosol layers (0.39),but was low in the loess layers.In Malan Loess,there were two weak paleosol layers,i.e.L1-S2 and L1-S1,which showed higher a* and a*/b*,but lower L* and h* than Malan Loess.h *,a*/b*,L* and a* could be used as good indicators of climatic change.A high a* and a */b*,or a low L* and h * indicated that the climate was warm and wet,and the pedogenesis was strong.In conclusion,h *,a*/b*,L* and a * together recorded the climatic evolution since the late Pleistocene:the climatic was cold and dry during the late Pleistocene,but a short warm and wet period happened in the glacial period (27.3-21.6 ka B.P.),then the climatic gradually became warm and humid during the early-mid Holocene.However,cold and dry climate appeared again since the late Holocene in the region.关键词
色度/黄土剖面/气候重建/庹家湾Key words
chroma/loess-paleosol profile/paleoclimatic reconstruction/Tuojiawan分类
天文与地球科学引用本文复制引用
王海燕,庞奖励,黄春长,周亚利,查小春,张文桐..郧西县庹家湾黄土剖面色度参数特征及其古气候重建[J].水土保持学报,2017,31(2):151-156,6.基金项目
国家自然科学基金项目(41271108,41371029,41471071) （41271108,41371029,41471071）
国家社会科学基金项目(14BZS070) （14BZS070）
中央高校基本科研项目(GK201601006) （GK201601006）
