ZHANG Wentong, PANG Jiangli, ZHOU Yali, et al. Pedogenic characteristics of Mituosi profile in the upper Hanjiang river valley and its response to climate change[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2017,56(6):31-37.
ZHANG Wentong, PANG Jiangli, ZHOU Yali, et al. Pedogenic characteristics of Mituosi profile in the upper Hanjiang river valley and its response to climate change[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2017,56(6):31-37.DOI:
)的风化成壤强度最弱。剖面风化成壤强度的变化揭示了自马兰黄土堆积以来记录的气候变化,马兰黄土形成时期气候干燥寒冷,过渡层黄土的存在则说明气候由干冷向暖湿转变,古土壤层形成时期气候最为温暖湿润,近代黄土形成时期气候由暖湿向干冷转变。此外,弥陀寺剖面还记录了在全新世大暖期期间的一次气候变冷事件,结合光释光(OSL)测年数据,确定此事件发生于6.48 ka BP左右。
Abstract
The Mituosi(MTS) profile in Yunxian
Hubei of China was served to investigate pedostratigraphy and sedimentary characteristics of the first river terrace of the upper Hanjiang river. Magnetic susceptibility
grainsize distribution
loss on ignition and Rb/Sr were analyzed. The MTS profile recorded the environmental evolution with the stratigraphic series from bottom to top: Malan Loess (L
1
)→ Transitional Loess (L
t
)→ Paleosol (S
0
)→ Holocene Loess (L
0
)→ Top soil (TS). Different stratigraphic units show different degree of weathering intensity
with S
0
>
L
t
>
L
0
>
L
1
. The weathering intensity change of MTS profile indicates the climate change since Malan loess accumulation. It was cold and arid with gradually intensified southeast monsoon during the early Holocene. The strongest monsoon occurred in the midHolocene. During the late Holocene
the climate became drying with the monsoon recession. A cold climate event was recorded in MTS profile
dating to around 6.48 Ka BP (OSL dating).
关键词
风化成壤气候变化黄土-古土壤汉江上游
Keywords
pedogenesisclimate changeloess-paleosolupper Hanjiang river