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| Pedogenic Characteristics of Liaowadian Holocene Loess Profile in the Upper Hanjiang River Valley of China and Its Response to Climate Change |
| Cui Tianyu, Pang Jiangli, Huang Chunchang, Zha Xiaochun, Zhou Yali, Wu Shuaihu, Yang Jianchao |
| College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China |
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Abstract The Liaowadian (LWD) profile in Yunxian, Hubei of China was surveyed in details. Investigations into this soil profile, including pedo-stratigraphy, chronology, were carried over the first river terrace of the upper Hanjiang River valley. Magnetic susceptibility, particle-size distribution, the contents of Rb and Sr were analyzed in laboratory. The result shows that LWD profile recorded the environment features and evolution with the stratigraphic series TS-L0-S0-Lt-L1. Different degree of weathering intensity in different stratigraphic units is paleosol S0 > Holocene loess L0 > modern TS>transitional loess layer Lt > Malan loess layer L1. The climate was dry and cold before 11 500 a BP and dust falls led to the formation of Malan loess layer L1. And between 11 500 a BP and 8 500 a BP, the climate got warmer, and was characterized by dry and wet, and dust falls led to the formation of Transitional loess layer Lt. During 8 500 a BP to 3 100 a BP, Yunxian basin experienced its warmest period with a warm and humid climate during Holocene, and dust falls led to the formation of S0. During the late Holocene, namely 3 100 a BP, the climate was deteriorating very quickly. It turned from warm to cold, and precipitation began to decline.
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Received: 19 August 2014
Published: 20 May 2015
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2015, Vol. 35 
