Chroma characteristics and its climatic significance in Holocene loess-paleosol sequence
DING Min1，2, PANG Jiang-li1*, HUANG Chun-chang1,PENG Shu-zhen2,YANG Jiong2, CHEN Dong-dong2
(1 College of Tourism and Environment, Shaanxi Normal University, Xi′an 710062, Shaanxi, China; 2 College of Tourism and Environmental Sciences, Taishan University, Tai′an 271021, Shandong, China)
Abstract:
The chroma index of lightness, redness and yellowness were measured respectively by K-MinoltaCR-400 and compared with the magnetic susceptibility, CaCO3 and Rb / Sr ratio. The results showed that redness and lightness indicators are sensitive to climate, which can reveal millennial scale monsoon holocene climate change, and furthermore sub-century scale changes. Redness is more sensitive to climate change in amplitude, and more helpful to reveal the climate of transition and the weak paleosol of ancient soils, but also has some limitations. Lightness is sensitive to changes and can be broadly reveal how much the regional precipitation. Yellowness index has the limited response to climate at Liangcun profile .
KeyWords:
chroma； loess-paleosol； Holocene； Guanzhong basin； environmental change
