MODELING LONG-TERM CATION SUPPLY IN ACIDIFIED FOREST STANDS

被引:86
作者
WARFVINGE, P
FALKENGRENGRERUP, U
SVERDRUP, H
ANDERSEN, B
机构
[1] LUND UNIV,DEPT PLANT ECOL,S-22361 LUND,SWEDEN
[2] COWI CONSULT,DK-2800 LYNGBY,DENMARK
关键词
D O I
10.1016/0269-7491(93)90041-L
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A dynamic soil chemistry model was used to explain the observed decrease in soil base saturation between 1949 and 1984 at three stands in southern Sweden. The results show that acid deposition has caused soil acidification. The model, SAFE (Soil Acidification in Forest Ecosystems), includes the fundamental physical processes such as leaching and accumulation, and chemical processes such as cation exchange, mineral weathering, nutrient uptake and solute equilibrium reactions. The sources and sinks of base cations in the soil system were quantified, showing that weathering, deposition of base cations and depletion of exchangeable base cations supply cations to the soil solution in similar amounts in the upper 1 m during the acidification phase. This demonstrates that budget studies alone cannot be used to distinguish between long-term capacity to resist acidification, represented by weathering, from short-term buffering caused by cation exchange.
引用
收藏
页码:209 / 221
页数:13
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