Sulphur Balances and Dynamics in Three Forested Catchments in Sweden
Sulphur Balances and Dynamics in Three Forested Catchments in Sweden
复制标题
瑞典三个森林流域的硫平衡和动态
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
H. Kvarnäs
中科院分区：
文献类型：
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作者：
S. Löfgren;L. Bringmark;M. Aastrup;H. Hultberg;K. Kindbom;H. Kvarnäs
在过去的十年中，硫磺(S)的沉积量大大减少，现在低于瑞典在1950年代中期记录的水平。然而，地表水中的硫酸盐浓度并没有下降到S沉降量减少所能预期的程度。流域研究表明，S的净输出表明，除了大气S的输入外，还有来自土壤的S源。这项研究是在瑞典南部和中部的三个森林覆盖的小流域进行的，这些流域是国家森林综合监测计划的一部分。其目的是评估S在不同生态系统内和不同生态系统之间的水平和通量，以追踪径流中过量S的可能来源。土壤水中硫酸盐浓度表明，S的过量来源于腐殖质和泥炭中有机结合的S的矿化和氧化，以及B层中Fe和Al氧化物对硫酸盐的解吸。后者将对S沉积的变化作出快速响应，而前者可能在短时间内独立于S沉积。这将对土壤和地表水酸化恢复的模型产生影响。
The deposition of sulphyr (S) has decreased considerably during the last decade and is now at levels below those recorded in the middle of the 1950s in Sweden. However, the sulphate concentrations in surface waters have not decreased to the extent that could be expected from the decreased S deposition. Catchment studies have shown a net S output, indicating a soil-derived S source besides the atmospheric S input. This study was performed in three small, forested catchments in southern and central Sweden, that are part of the national, integrated monitoring program for forests. The aim was to assess S levels and fluxes in and between the different compartments of the ecosystems in order to trace the possible sources of excess S in runoff. The sulphate concentrations in soil water indicate that the excess S originates from mineralization and oxidation of organically bound S in humus and peat, as well as from desorption of sulphate from Fe and Al oxohydroxides in the B-horizon. The latter process will quickly respond to changes in S deposition, while the former probably is independent of S deposition in a short time perspective. This will have implications for the modelling of recovery from soil and surface water acidification.