Change in river water chemistry as affected by the confluence of forest drainage water in dairy farming area on Hokkaido Island, Northern Japan
Change in river water chemistry as affected by the confluence of forest drainage water in dairy farming area on Hokkaido Island, Northern Japan
复制标题
日本北部北海道岛奶牛养殖区森林排水汇合对河水化学变化的影响
DOI：
10.1007/bf02762601
复制
发表时间：
2002
影响因子：
1.5
通讯作者：
Kazunori Mawatari
中科院分区：
文献类型：
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作者：
Y. Nakagawa;T. Nakashima;Kazunori Mawatari
我们评估了以牧场为主的分水岭和以森林为主要分水岭的河流水化学的差异，以及河流排干牧场的化学如何受河流排出森林的化学影响。我们选择了一条河流(指定为T河)来排水牧场(3587公顷)，以及两条河流来排水日本北部北海道东部的森林(738公顷和879公顷)。在降水和解冻引起的河流流量较大时，NO3-−、SO42-−、K+、Fe和Al的浓度增加，表明浅层土层作为其来源的相对重要性。另一方面，土壤中的Na+、Mg2+、Ca2+和Si含量降低，表明土壤深层来源的相对重要性。T河水体中NO_3-−、Cl-−、SO_4~(2+)−、K~+、Na~+、Mg~(2+)、Ca~(2+)和Fe的浓度均高于森林排水水体，说明奶牛的排泄成分对奶牛的排泄有一定的贡献。硅浓度则表现出相反的模式。森林排水汇流后，T河中NO_3-−、Cl-−、SO_4~(2+)、K~+、Na~+、−~(2+)、Ca~(2+)(p<；0.001)和Fe(p<；0.05)浓度降低，而Si浓度升高(p<；0.001)。河流化学变化的原因是森林排水的汇流。这些发现表明，森林在冲淡受污染的河流方面发挥了环境作用。
We evaluated i) the difference in river water chemistry between a watershed mainly consisting of pasture and a watershed mainly consisting of forest, and ii) how the chemistry of river draining the pasture is influenced by that of the river draining the forest. We selected one river (designated as the T-river) draining the pasture (3,587 ha), and two rivers draining a forest (738 and 879 ha) in eastern Hokkaido, northern Japan. During higher river flow due to precipitation and thawing, the concentrations of NO3−, SO42−, K+, Fe, and Al increased, suggesting the relative importance of the shallow soil layer as their source. On the other hand, Na+, Mg2+, Ca2+, and Si decreased, suggesting the relative importance of the source in a deep soil layer. The concentrations of NO3−, Cl−, SO42−, K+, Na+, Mg2+, Ca2+, and Fe were higher in the T-river than in the forest drainage waters, suggesting the contribution of the excretion components from the milk cows. The Si concentration exhibited the opposite pattern. The concentrations of NO3−, Cl−, SO42−, K+, Na+, Mg2+, Ca2+(p<0.001), and Fe (p<0.05) in the T-river decreased after the confluence of the forest drainage waters, while Si concentration increased (p<0.001). The reason for the change in river chemistry was the confluence of the forest drainage waters. These findings suggested the environmental role of the forest in the dilution of the polluted river.