Impacts of Hydrological Changes on Nutrient Transport From Diffuse Sources in a Rural River Basin, Western Japan
Impacts of Hydrological Changes on Nutrient Transport From Diffuse Sources in a Rural River Basin, Western Japan
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水文变化对日本西部乡村河流域扩散源养分输送的影响
DOI：
10.1029/2018jg004513
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Takahashi Erina
中科院分区：
文献类型：
--
作者：
Ide Jun'ichiro;Takeda Ikuo;Somura Hiroaki;Mori Yasushi;Sakuno Yuji;Yone Yasumichi;Takahashi Erina
气候变化导致的暴雨频率增加可能会影响从森林和农田向下游河流的营养输送。然而，关于土地覆盖对下游河流营养盐浓度的影响如何根据水文条件而变化的信息很少。为了阐明这一点，我们调查了降水量和河流流量的变化对河流营养盐浓度（总氮，总磷，硝酸盐和磷酸盐）和土地覆盖之间的关系在8个子流域的比伊河流域，日本西部的影响。我们假设，针叶林和农业用地，包括管理不善的，这需要间伐和施肥管理，分别有助于增加在下游河流在风暴期间的营养浓度。基于18年观察数据的线性混合效应模型分析用于检验假设。结果表明，养分浓度与针叶林和阔叶林面积比之间的多元回归分析的斜率为负，并随着日降水量的增加而减小。这表明，在风暴期间，森林对河流营养盐浓度的稀释有贡献，无论它们是针叶还是阔叶。相比之下，养分浓度与农业面积比之间的回归斜率显示出相反的趋势，这表明随着降水量的增加，即使是很小比例的农业面积也会对养分浓度的增加做出很大贡献。我们的研究结果意味着，暴雨径流响应降雨的结果在一个升高的供应氮和磷附着到耕地土壤的河流。
Increased frequency of heavy rainfall caused by climate change may affect nutrient transport from forests and agricultural lands into downstream rivers. However, little information is available on how the effects of land cover on nutrient concentrations in the downstream rivers change depending on hydrological conditions. To elucidate this, we investigated the effects of changes in precipitation and river discharge on the relationship between river nutrient concentrations (total nitrogen, total phosphorus, nitrate, and phosphate) and land cover in eight subbasins of the Hii River basin, western Japan. We hypothesized that coniferous forests and agricultural lands including poorly managed ones, which require thinning and fertilizer management, respectively, contribute to increases in nutrient concentrations in downstream rivers during storms. Linear mixed‐effects model analyses based on 18‐year observation data were used for testing the hypothesis. Results revealed that the slopes of the multiple regression analysis between nutrient concentrations and coniferous and broad‐leaved forest area ratios were negative and decreased with increasing daily precipitation. This suggests that forests contributed to the dilution of river nutrient concentrations during storms regardless of whether they were coniferous or broad leaved. In contrast, the slope of regression between nutrient concentrations and agricultural area ratio revealed the opposite trend, indicating that even a small percentage of agricultural area makes a large contribution to increases in nutrient concentrations as precipitation increases. Our results imply that storm runoff in response to rainfall results in an elevated supply of nitrogen and phosphorus attached to arable soils to the river.
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雨滴飞溅侵蚀引起的森林陡坡地表物质迁移率
影响因子：
1.5
作者：
S. Miura;K. Hirai;Tsuyoshi Yamada
通讯作者：
Tsuyoshi Yamada
林下林对扁柏人工林入渗能力的影响（一）雾式降雨模拟器试验结果
DOI：
10.11519/jjfs1953.77.3_224
发表时间：
1995
期刊：
Journal of The Japanese Forest Society
影响因子：
--
作者：
N. Yukawa;Y. Onda
通讯作者：
Y. Onda
日本磷肥需求及农田土壤磷平衡变化趋势
影响因子：
2
作者：
S. Mishima;S. Itahashi;Ryosuke Kimura;Tsunehisa Inoue
通讯作者：
Tsunehisa Inoue
具有土地利用邻近性和季节性的流内非点源养分预测
DOI：
10.2134/jeq1998.00472425002700010015x
发表时间：
1998
期刊：
影响因子：
--
作者：
D. Tufford;H. McKellar;J. Hussey
通讯作者：
J. Hussey
人口稀少流域水质的长期趋势和降水的影响
DOI：
10.2965/jwet.2009.293
发表时间：
2009
期刊：
影响因子：
--
作者：
I. Takeda;A. Fukushima;H. Somura
通讯作者：
H. Somura