Study on Accumulation and Transportation of Refractory Organic Materials in Terrestrial Area

陆地地区耐火有机物堆积与输送研究

• 批准号: 15310002
• 负责人: NAGAO Seiya
• 金额: $ 9.92万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15310002/
• 关键词: River; Dissolved organic matter; Suspended solids; Carbon Cycle; Carbon isotopes; Humic substances; Radiocarbon; Snow melt; 粒子態有機物; 土壌有機物; 降雨; 難分解性有機物; フミン酸; フルボ酸; 溶存有機炭素; 河川水; 移行動態

An important part of global organic carbon cycle is the flux of terrestrial organic carbon from the continents to the oceans. The potential importance of coastal systems in global and regional organic budgets is still unclear because of the inherent complexity and variability of rivers, estuaries and coastal zones. Therefore, it is important to understand the organic matter cycling in estuaries and coastal systems, especially characteristics and dynamics of river DOM and POM. But the DOM and POM is not homogeneous in terms of size or chemical characteristics so that we can't evaluate the linkage of terrestrial and coastal environments. The objective of this study is to understand the transport behavior of dissolved and particulate organic matter from terrestrial region to ocean. This study used carbon isotopic ratios (Δ^<14>C and δ^<13>C values) as tracers of organic carbon because the simultaneous use of these values adds a second dimension to isotopic studies of carbon cycling in surface aquatic environments.Refractory organic materials, humic substances, were isolated from the river waters in Scotland, Ukraine, Japan and Indonesia by the XAD extraction. The Δ^<14>C values of dissolved humic substances ranged from -316‰ to +209‰, indicating spatial and temporal distribution.To understand transport of POM in river systems, we selected three river systems (Tokachi, Ishikari and Kuji River systems) with different watershed conditions and carried out the observation at a fixed point in each river. The Δ^<14>C values range from -111 to -286‰ for the Tokachi River in northeast Hokkaido, -103〜-364‰ for the Ishikari River in southeast Hokkaido and -18.7〜-94.4‰ for the Kuji River in Kanto area in Japan. The paired Δ^<14>C vs. δ^<13>C distributions vary with rivers and seasons. These results suggest that the difference in paired Δ^<14>C vs. δ^<13>C distributions may reflect the water discharge and watershed environments.

陆地有机碳向海洋的通量是全球有机碳循环的重要组成部分。由于河流、河口和沿海地区固有的复杂性和多变性，沿海系统在全球和区域有机预算中的潜在重要性仍不清楚。因此，了解河口海岸系统有机质循环，特别是河流DOM和POM的特征和动态具有重要意义。但DOM和POM在大小和化学性质上并不均一，因此我们无法评价陆地和海岸环境的联系。本研究的目的是了解溶解有机物和颗粒有机物从陆地区域到海洋的迁移行为。本研究使用碳同位素比值（Δ^<14>C和δ^<13>C值）作为有机碳的示踪剂，因为这些值的同时使用为表层水环境中碳循环的同位素研究增加了第二个维度。为<14>了解POM在河流系统中的迁移规律，选择了三个具有不同流域条件的河流系统（十胜河、石狩河和久慈河），在每条河流中进行了定点观测。北海道<14>东北部十胜川、北海道东南部石狩川和关东地区久慈川的Δ^ C值分别为-111 ‰ ~-286‰、-103 ‰ ~ 364 ‰和-18.7 ‰ ~ 94.4 ‰。Δ^<14>C与δ^<13>C的配对分布随河流和季节而变化。这些结果表明，成对的Δ^<14>C与δ^<13>C分布的差异可能反映了水量和流域环境。

项目成果

水の分析

水分析

• 发表时间: 2005
• 作者: S.Nagao et al.;長尾誠也(分担執筆)
• 通讯作者: 長尾誠也(分担執筆)

Changes in elemental composition, molecular weight, and 1H NMR spectrum of water-extractble hudrophobic acids in cambisols with season and soil depth

成土土中水溶性疏酸的元素组成、分子量和 1H NMR 谱随季节和土壤深度的变化

• 期刊: Soil Science Plant Nutrition (in press)
• 作者: S.Nagao;T.Usui;M.Yamamoto;M.Minagawa;T.Iwatsuki;A;Noda;長尾 誠也;S.Nagao et al.;T.Matsunaga et al.;S.Nagao;S.Nagao et al.;長尾 誠也;S.Nagao;D.Asakawa et al.;D.Asakawa et al.
• 通讯作者: D.Asakawa et al.

Distribution and sources of organic matter in surface sediments on the shelf and slope off Tokachi,western North Pacific,inferred from C and N stable isotopes and C/N ratios

西北太平洋十胜陆架和陆坡表层沉积物有机质分布及来源——从C、N稳定同位素和C/N比推断

• 发表时间: 2006
• 期刊: Marine Chemistry 98
• 作者: T.Usui et al.

Analysis of dissolved forms and characteristics of humic substances (in Japanese)

腐殖质溶解形态及特性分析（日语）

• 发表时间: 2004
• 期刊: Journal of Japan Society on Water Environment 27
• 作者: S.Nagao;T.Usui;M.Yamamoto;M.Minagawa;T.Iwatsuki;A;Noda;長尾 誠也;S.Nagao et al.;T.Matsunaga et al.;S.Nagao
• 通讯作者: S.Nagao

長尾 誠也: "水中腐植物質の溶存形態解析"日本水環境学誌. 27・2. 92-95 (2004)

长尾征也：“水中腐殖质的溶解形态分析”日本水环境杂志27・2（2004）。