Preliminary investigation of the formation age and chemical characterization of the tropical peat in the middle Sepik Plain, northern Papua New Guinea

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• 作者：Eisuke Ono ; Mitsutoshi Umemura ; Takuya Ishida ; Chisato Takenaka
• 关键词：Blackwater Lakes ; Papua New Guinea ; Sago palm ; Sepik River ; Tropical peat
• 刊名：Geoscience Letters
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：2
• 期：1
• 全文大小：2992KB
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• 作者单位：Eisuke Ono (1)
  Mitsutoshi Umemura (2)
  Takuya Ishida (2)
  Chisato Takenaka (2)
  
  1. School of Education, Niigata University, 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, 950-2181, Japan
  2. Graduate School of Bio-agricultural Sciences and School of Agricultural Sciences, Nagoya University Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan
  
• 刊物类别：Earth Sciences, general; Atmospheric Sciences; Geophysics/Geodesy; Oceanography; Planetology; Biogeo
• 刊物主题：Earth Sciences, general; Atmospheric Sciences; Geophysics/Geodesy; Oceanography; Planetology; Biogeosciences;
• 出版者：Springer International Publishing
• ISSN：2196-4092

文摘

Seven gouge cores in the middle Sepik Plain (northern Papua New Guinea) were bored to clarify the depositional age and the chemical characteristics of the tropical peat. The weakly-acidic peat layer (3- m thick) is distributed around the south bank of the Blackwater Lakes. The peat layer consists mainly of sago palm and grass remains within a mineral matrix of very fine sand and clay. Radiocarbon dating indicates that the peat’s formation had commenced by 3,710-,560 cal BP. Nitrogen and exchangeable potassium reach their highest values in the upper 60 cm of the peat column. Conversely, exchangeable sodium, calcium and magnesium, as well as carbon, increase their values with depth in the peat. These differences in the exchangeable cations-contribution suggest changes in the plant species, which were decomposed during the peat’s formation. Keywords Blackwater Lakes Papua New Guinea Sago palm Sepik River Tropical peat