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荒木, 祐二 ; 長岡, 一樹 ; 塚脇, 真二 ; Araki, Yuji ; Nagaoka, Kazuki ; Tsukawaki, Shinji
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The Noto Peninsula, situated in an intermediate-temperate forest region in the north of Japan, was designated as an area containing .. Globally Important Agricultural Heritage Systems (GIAHS)" by the Food and Agricultural Organization
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(FAQ) of the United Nations (UN) in 2011. Nonetheless, despite this status, artificial forests on the peninsula are being abandoned and suffer from poor undergrowth vegetation. Therefore there are concerns that the forests are losing their original functions such as the development of water catchment areas and the prevention of surface soil erosion. In order to make a contribution to sustainable artificial forestry management, this study aimed to clarify the relationship between undergrowth vegetation and the topography in the artificial forests of the Noto Peninsula. Undergrowth vegetation was investigated using phytosociological methods in 27 randomly set 100m2 quadrats in September and October 2015. As a result, the undergrowth vegetation in an artificial forest of the Noto Peninsula was classified into three vegetation types: (I) a high-altitude area type, (2) a low-altitude area in the peninsula's northern outer region (.. sotoura") type, and (3) a low-altitude area in the peninsula's southern inner region (.. uchiura") type. The differences in species composition between the vegetation types is mainly defined by the sea level, secondary to have been located at a position facing the seaside.
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Tamura, Toru ; Saito, Yoshiki ; Sieng, Sotham ; Ben, Bunnarin ; Kong, Meng ; Choup, Sokuntheara ; Tsukawaki, Shinji
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The depositional facies and radiocarbon ages of a long Holocene sediment core (KS) from Cambodia are reported here to cl
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arify the sedimentary environments of the Mekong River delta system at the time of Holocene maximum flooding by the sea. The 30.7-m-long KS core, from the upper Mekong River lowland about 20 km southeast of Phnom Penh, penetrated five depositional facies, A to E in ascending order. Facies A is cross-laminated fluvial sand. Facies B is laminated, very fine sand with mud drapes.Facies C to E are salt marsh, flood-plain and natural-levee deposits, characterized by a succession of peat, organic clay, and reddish brown silt. Facies B dates to 9.0 to 7.5 ka and is interpreted as aggradational tidal deposits, 16.5 m thick, deposited during a rapid rise of sea level; these deposits became overlain by an accumulation of salt marsh and flood-plain deposits during the subsequent period of slowly rising and then falling sea level. The maximum flooding surface lies in the Facies B interval. The presence of tidal deposits implies that the core site, about 230 km inland from the present river mouth, was near the shoreline and experienced strong tidal influences during the early Holocene.© 2006 Elsevier Ltd. All rights reserved.
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Sugawara, Daisuke ; Minoura, Koji ; Nemoto, Naoki ; Tsukawaki, Shinji ; Goto, Kazuhisa ; Imamura, Fumihiko
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Micropaleontological analysis of nearshore to offshore sediments recovered from the southwestern coast of Thailand was p
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erformed to clarify the submarine processes of sediment transport and deposition during the 2004 Indian Ocean tsunami. The distribution pattern of benthic foraminifers showed seaward migration after the tsunami event. Agglutinated foraminifers, which are characteristic of an intertidal brackish environment, were identified in the post-tsunami samples from foreshore to offshore zones. These suggest that sediments originally distributed in foreshore to nearshore zones were transported offshore due to the tsunami backwash. On the other hand, the distribution pattern of planktonic and benthic species living in offshore zones showed slight evidence of landward migration by the tsunami. This suggests that landward redistribution of sediments by the tsunami run-up did not occur in the offshore seafloor of the study area. Our results and a review of previous studies provide an interpretation of submarine sedimentation by tsunamis. It is possible that tsunami backwashes induce sediment flows that transport a large amount of coastal materials seaward. Thus, traces of paleotsunami backwashes can be identified in offshore sedimentary environments as the accumulation of allochthonous materials. This can be recognized as changes in benthic foraminiferal assemblages. © 2009 The Authors Journal compilation © 2009 Blackwell Publishing Asia Pty Ltd.
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Okawara, Masafumi ; Tsukawaki, Shinji
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金沢大学環日本海域環境研究センターエコテクノロジー研究部門
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Tsukawaki, Shinji ; Domitsu, Hanako ; Fukaya, Yasuyuki ; Furuuchi, Masami ; Kamada, Kotaro ; Kamiya, Takahiro ; Kumakiri, Michiko ; Murase, Takahiro ; Sakano, Takeo ; Seikai, Tadahisa ; Takahashi, Yoshie
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Tsukawaki, Shinji ; Ozawa, Hirokazu ; Ooji, Akihito
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Tsukawaki, Shinji ; Domitsu, Hanako ; Oda, Motoyoshi
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Tsukawaki, Shinji
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Ozawa, Hirokazu ; Tsukawaki, Shinji
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Tsukawaki, Shinji ; Ohtaka, Akifumi ; Tanaka, Gengo ; Watanabe, Masaharu
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