Long-term changes in episodic acidification of streams in Shenandoah National Park, Virginia (USA)

被引:12
作者
Eshleman, KN [1 ]
MillerMarshall, LM [1 ]
Webb, JR [1 ]
机构
[1] UNIV VIRGINIA,DEPT ENVIRONM SCI,CHARLOTTESVILLE,VA 22903
关键词
D O I
10.1007/BF00476881
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Episodic acidification-the short-term loss of acid neutralizing capacity (ANC) in surface waters during periods associated with rainfall and snowmelt runoff-has been shown in previous field studies to be a ubiquitous process that can have long-term adverse effects on fish populations. A systematic field study of episodic acidification in five gaged Shenandoah National Park (SNP) streams was initiated in 1991, while a long-term study of changes in acid-base chemistry in four gaged SNP streams has been in operation since 1979. Statistical analysis of the long-term record of mean daily discharge and weekly streamwater chemical composition was performed to identify the dominant processes that control episodic acidification of SNP streams; an objective hydrological separation technique was used to determine whether each weekly sample was taken during antecedent baseflow or stormflow conditions. Using this technique, more than 100 ''stormflow/baseflow pairs'' were identified in the long-term (1980-1992) record for White Oak Run from which episodic chemical changes were estimated. Statistical analysis of the resultant data suggested that mean episodic depressions in ANC have increased by nearly a factor of two in White Oak Run since the first outbreak of forest defoliation by the gypsy moth caterpillar during the summer of 1990.
引用
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页码:517 / 522
页数:6
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