Abstract Calcium and strontium isotope ratios were used to identify Ca sources for bulk soil, soil solutions and runoff in the stressed forest ecosystems of Central Europe. All three study sites are underlain by Ca-poor crystalline bedrock (orthogneiss, leucogranite and serpentinite, respectively), but differ in historical rates of acid deposition. UDL, the spruce die-back affected site at the Czech–Polish border underlain by orthogneiss, received six times more acidifying compounds from the atmosphere than LYS and PLB, two paired catchments near the Czech–German border. The paired catchments near the Czech–German border, whose forests were only mildly damaged by industrial pollution, differ in their acid buffering capacity (extremely low for LYS leucogranite, extremely high for PLB serpentinite). At the spruce die-back affected catchment UDL, 19 years of monthly hydrochemical monitoring revealed six times higher atmospheric deposition and runoff fluxes of Ca, compared to the paired catchments LYS and PLB. Across the three sites, the mean δ44Ca values increased in the order: spruce bark (−0.84‰)

中文翻译：

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中欧捷克共和国三个污染森林生态系统中的钙和锶同位素动态

摘要 钙和锶同位素比率用于确定中欧受压森林生态系统中大量土壤、土壤溶液和径流的 Ca 来源。所有三个研究地点都位于贫钙结晶基岩（分别为正方麻岩、白花岗岩和蛇纹岩）之下，但酸沉积的历史速率不同。UDL 是捷克-波兰边界的云杉枯死受影响地点，位于正片麻岩之下，从大气中吸收的酸化化合物是捷克-德国边界附近的两个成对集水区 LYS 和 PLB 的六倍。捷克-德国边境附近的成对集水区的森林仅受工业污染轻度破坏，其酸缓冲能力不同（LYS 白花岗岩极低，PLB 蛇纹岩极高）。在云杉枯死影响的集水区 UDL，19 年的月度水化学监测显示，与配对集水区 LYS 和 PLB 相比，Ca 的大气沉降和径流通量高 6 倍。在三个站点中，平均 δ44Ca 值依次增加：云杉树皮 (-0.84‰)