PODZOLIZATION: SOIL PROCESSES CONTROL DISSOLVED ORGANIC CARBON CONCENTRATIONS IN STREAM WATER
PODZOLIZATION: SOIL PROCESSES CONTROL DISSOLVED ORGANIC CARBON CONCENTRATIONS IN STREAM WATER
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DOI：
10.1097/00010694-198401000-00004
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发表时间：
1984-01
期刊：
影响因子：
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通讯作者：
W. McDowell;T. Wood
中科院分区：
文献类型：
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作者：
W. McDowell;T. Wood
我们测量了溶解有机碳（DOC）的土壤溶液中收集的A和B层的灰土在中部新罕布什尔州。DOC在A2层平均为33 mg/L，在B层下降到2 ~ 3 mg/L，与河水浓度相似。DOC浓度在A2层蒸渗仪呈负相关，每天收集的水的体积，我们观察到的最大浓度（约55毫克/升）在9月。在B层蒸渗仪中，DOC水平相对恒定，因为在流水中的水平。室内试验表明，B层土壤对A2层土壤溶解性有机碳的吸收较快。吸附等温线预测的DOC平衡浓度与蒸渗仪结果一致，在1至2 mg/L。我们的研究结果表明，共沉淀铁和有机物在上B层，一个过程的中心灰化，在很大程度上控制了溶解有机碳的浓度在哈伯德溪的溪流。
We measured dissolved organic carbon (DOC) in soil solutions collected from the A and B horizons of a Spodosol in central New Hampshire. DOC averaged 33 mg/L in the A2 horizon and declined to 2 to 3 mg/L, similar to stream water concentrations, in the B horizon. DOC concentrations in A2 horizon lysimeters were inversely related to the volume of water collected per day; we observed maximum concentrations (approximately 55 mg/L) during September. In the B horizon lysimeters, DOC levels were relatively constant, as were levels in stream water. In laboratory experiments, DOC in A2 horizon soil solution was rapidly absorbed by B horizon soils. The equilibrium DOC concentrations predicted by adsorption isotherms agreed to within 1 to 2 mg/L with lysimeter results. Our results suggest that coprecipitation of iron and organic matter in the upper B horizon, a process central to podzolization, largely controls the concentration of dissolved organic carbon in stream water at Hubbard Brook.