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首页> 外文期刊>Ecological research >Fluvial transport of carbon along the river-to-ocean continuum and its potential impacts on a brackish water food web in the Iwaki River watershed, northern Japan
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Fluvial transport of carbon along the river-to-ocean continuum and its potential impacts on a brackish water food web in the Iwaki River watershed, northern Japan

机译：沿河流-海洋连续体的河流碳运移及其对日本北部岩城河流域咸淡水食物网的潜在影响

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摘要

Riverine transport of dissolved inorganic carbon (DIC) from land to the ocean is an important carbon flux that influences the carbon budget at the watershed scale. However, the dynamics of DIC in an entire river network has remained unknown, especially in mountainous Japanese watersheds. We examined the effects of watershed land use and geology on the transports of inorganic carbon as well as weathered silica (Si) and calcium (Ca) in the Iwaki River system where agricultural and residential areas have developed in the middle and lower parts of the watershed. The concentration and stable carbon isotope ratios (δ~(13)C) of DIC showed the longitudinal increase of ~(13)C-depleted inorganic carbon along the river. As a result, most streams and rivers were supersaturated in dissolved CO_2 that will eventually be emitted to the atmosphere. The possible origin of ~(13)C-depleted carbon is CO_2 derived from the decomposition of organic matter in agricultural and urban landscapes, as well as from in-stream respiration. In addition, agricultural and urban areas, respectively, exported the large amount of dissolved Si and Ca to the rivers, suggesting that CO_2 increased by respiration accelerates the chemical weathering of silicate and carbonate materials in soils, river sediments, and/or urban infrastructure. Furthermore, riverine bicarbonate flux is likely to enter shell carbonates of Corbicula japonica, an aragonitic bivalve, in the downstream brackish lake (Lake Jusan). These results revealed that the flux of DIC from the human-dominated watersheds is a key to understanding the carbon dynamics and food-web structure along the land-to-river-to-ocean continuum.
机译：河流中的溶解性无机碳（DIC）从陆地到海洋的运输是重要的碳通量，它会影响分水岭规模的碳收支。但是，DIC在整个河网中的动态仍然未知，特别是在日本山区流域。我们研究了流域土地利用和地质状况对茨城河流系统中无机碳，风化硅（Si）和钙（Ca）运移的影响，该地区在流域的中部和下部都有农业和居民区。 。 DIC的浓度和稳定的碳同位素比（δ〜（13）C）表明，沿河流失了〜（13）C的无机碳的纵向增加。结果，大多数溪流和河流都被溶解的CO_2过饱和，最终将其排放到大气中。 〜（13）C贫化碳的可能来源是CO_2，其来源于农业和城市景观中有机物的分解以及河流中的呼吸作用。此外，农业和城市地区分别向河道出口了大量溶解的Si和Ca，这表明通过呼吸作用增加的CO_2加速了土壤，河流沉积物和/或城市基础设施中硅酸盐和碳酸盐材料的化学风化。此外，河流中的碳酸氢盐通量可能会进入下游咸咸湖（朱桑湖）中的文石双壳类的日本象鼻虫（Corbicula japonica）的壳碳酸盐。这些结果表明，人为主导的分水岭的DIC通量是了解沿陆到河到海洋连续体的碳动态和食物网结构的关键。

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