We investigated the sea salt deposition process on the soil in a coastal black pine (Pinusthunbergii Parlatore) forest in Japan with reference to sea salt scavenging by the forest canopy and the following washout by precipitation. We collected throughfall and soil-infiltration water along transects crossing the coastal forest and measured the water chemistry—electric conductivity, pH, major cations (NH4+, Na+, K+, Mg2+, and Ca2+), major anions (Cl−, SO42−, NO2−, NO3−, and PO43−), and total organic carbon—at 10-m intervals on the survey transects. Leaching of base cations from surface soil kept lower acidity of soil water in the evergreen broadleaf forest, whereas soil infiltration water was acidified in the soil surface in the P. thunbergii forest. Hot spots of sea salt deposition on the soil surface were observed at hollows of the ground surface, slope-facing coastal line, or sites with an abrupt increase in height where the canopy faces the coast. However, the edge effect in sea salt scavenging was not evident in the juvenile stand at the forest edge, which had a height of 10 m.

中文翻译：

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滨海松林海盐沉积空间分布

我们研究了日本沿海黑松 (Pinusthunbergii Parlatore) 森林土壤中海盐的沉积过程，参考森林冠层清除海盐和随后的降水冲刷。我们沿着穿过沿海森林的横断面收集了直落水和土壤渗透水，并测量了水的化学性质——电导率、pH、主要阳离子（NH4+、Na+、K+、Mg2+ 和 Ca2+）、主要阴离子（Cl-、SO42-、NO2 −、NO3− 和 PO43−) 和总有机碳——在调查断面上以 10 米为间隔。表层土壤碱性阳离子的浸出使常绿阔叶林土壤水的酸度保持较低，而松柏林土壤表面的土壤渗透水酸化。在地表凹陷处观察到海盐沉积在土壤表面的热点，面向斜坡的海岸线，或树冠面向海岸的高度突然增加的地点。然而，在林缘幼林中，海盐清除的边缘效应并不明显，其高度为 10 m。