Export of dissolved iron from river catchments in northeast Japan
Export of dissolved iron from river catchments in northeast Japan
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DOI：
10.1007/s11355-020-00435-6
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发表时间：
2021-01
影响因子：
2
通讯作者：
Yuta Endo;A. Allam;Masafumi Natsuike;C. Yoshimura;M. Fujii
中科院分区：
文献类型：
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作者：
Yuta Endo;A. Allam;Masafumi Natsuike;C. Yoshimura;M. Fujii
本研究调查了溶解铁（DFe）从河流流域的输出，重点是土地利用和土地覆盖（LULC）。在夏季和冬季，分别在日本东北部的北上山的61和63个站点测量DFe浓度。利用GRASS GIS软件将土地利用类型划分为阔叶林、针叶林、草地、水田、农田和城市。在下游地区，冬季和夏季河流DFe浓度分别为0.84 ~ 115 μg/L和1.5 ~ 103 μg/L，而上游地区DFe浓度分别为0.16 ~ 7.6 μg/L和1.1 ~ 20.0 μg/L。对DFe和LULC数据进行回归分析，估算了每种LULC类型的DFe单位负荷值，冬季阔叶林、稻田和城区的DFe单位负荷值分别为1.6、139和439 g/km 2/d，夏季草地、稻田和城区的DFe单位负荷值分别为61.9、564和727 g/km 2/d。反映了不同季节性的影响。各季节城市面积与河流DFe浓度呈显著正相关，强调人类活动对DFe向流域输出的影响。总的来说，我们的调查提供了一系列的定量证据，表明LULC的重要性，了解从河流集水区的DFe输出。
This study investigated the export of dissolved iron (DFe) from river catchments with emphasis on land use and land cover (LULC). The DFe concentrations were measured at 61 and 63 sites during summer and winter, respectively, in the Kitakami Mountain in northeast Japan. LULC was classified as broadleaf forest, conifer, grassland, paddy field, cropland, and urban area using GRASS GIS software. In the downstream areas, the riverine DFe concentrations ranged from 0.84 to 115 μg/L and from 1.5 to 103 μg/L in winter and summer, respectively, whereas the DFe in the upstream areas ranged from 0.16 to 7.6 μg/L and from 1.1 to 20.0 μg/L. Regression analysis was applied to the DFe and LULC data, and the unit load for DFe was estimated for each LULC type, the unit load values being 1.6, 139, and 439 g/km2/day for broadleaf forest, paddy fields, and urban area, respectively, in winter and 61.9, 564, and 727 g/km2/day for grassland, paddy fields, and urban area, respectively, in summer, reflecting the impact of distinct seasonality. A significant positive correlation was found between urban area and riverine DFe concentration in each season, emphasizing the influence of human activity on DFe export to river catchments. Overall, our investigation provides a series of quantitative evidence showing the importance of LULC to understand DFe export from river catchments.