Spatial variability of soil solution chemistry under Hinoki cypress (Chamaecyparis obtusa) in Tama Hills
Spatial variability of soil solution chemistry under Hinoki cypress (Chamaecyparis obtusa) in Tama Hills
复制标题
多摩丘陵扁柏 (Chamaecyparis obtusa) 土壤溶液化学的空间变异
DOI：
10.1080/00380768.1999.10409347
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
M. Okazaki
中科院分区：
文献类型：
--
作者：
M. Baba;M. Okazaki
摘要根据日本柏树树干周围土壤溶液化学的空间变异性，对东京八知町滚土实验室的降水和土壤溶液进行了监测研究，分析了土壤酸化过程。土壤溶液样本在离树干不同距离和不同深度采集。大树主干下坡10 cm土壤溶液pH降至4.1~4.2，可能是由于穿透雨输入的异质性和酸性树干径流的广泛入渗所致。穿透雨和树干径流带来的铵离子被硝化并提供了大量的H+。质子被可交换的阳离子取代。当盐基离子耗尽时，铝离子成为主要的阳离子物种。平均而言，10 cm土层土壤溶液中的Ca~(2+)浓度由参照点的0.28mmol.L~(-1)降至下坡的0.18mmol.L~(-1)，而Mg~(2+)浓度则下降.
Abstract A monitoring study on precipitation and soil solution was conducted to analyze soil acidification processes at the Rolling Land Laboratory (RLL), Hachioji, Tokyo based on the spatial variability of the soil solution chemistry around the Hinoki cypress (Chamaecyparis obtusa) trunk. Soil solution samples were taken at various distances from the tree trunks and at various depths. Soil solution pH at the depth of 10 cm decreased to 4.1–4.2 on the downslope side of large tree trunks, presumably due to the heterogeneity of throughfall input and extensive infiltration of acidic stemflow. Ammonium ions brought by throughfall and stemflow were nitrified and provided large amounts of H+. Protons were replaced with exchangeable cations. When base cations were depleted, aluminum ion became the dominant cation species. On the average, Ca2+ concentration in the soil solutions at the depth of 10 cm decreased from 0.28 mmolc L-1 at the reference site to 0.18 mmolc L-1 on the downslope side and Mg2+ concentration...