Change in the acid-base status of an appalachian mountain catchment following forest defoliation by the gypsy moth
Change in the acid-base status of an appalachian mountain catchment following forest defoliation by the gypsy moth
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舞毒蛾森林落叶后阿巴拉契亚山脉流域酸碱状况的变化
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Galloway
中科院分区：
文献类型：
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作者：
J. R. Webb;B. Cosby;F. A. Deviney;K. N. Eshleman;J. Galloway
舞毒蛾（舞毒蛾）的侵扰可以改变受影响集水区的地球化学条件。在1980-1993年期间获得的白色橡树溪（弗吉尼亚州谢南多厄国家公园的一条溪流）的河水浓度数据，表明集水区酸碱状态变化与蛾类幼虫对森林落叶有关。落叶后的流水浓度变化包括强酸阴离子，碱阳离子，和氢离子的浓度增加，以及降低浓度的酸中和能力（ANC）和硫酸盐。变化最大的是硝酸盐的浓度;年排放加权平均浓度从落叶前的水平始终低于5 μeq L−1增加到落叶后的水平高于50 μeq L−1。酸化的加剧表明创纪录的高氢离子浓度和创纪录的低ANC浓度。由于观察到的反应的非线性和未知的恢复和复发模式，长期的生物地球化学的影响是不确定的。
Infestation by the gypsy moth (Lymantria dispar) can alter biogeochemical conditions in affected catchments. Stream-water concentration data obtained over the period of 1980–1993 for White Oak Run, a stream in Shenandoah National Park, Va., indicate that change in catchment acid-base status is associated with forest defoliation by the moth larva. Stream-water concentration changes following defoliation included increasing concentrations of strong-acid anions, base-cations, and hydrogen ion, as well as decreasing concentrations of acid-neutralization capacity (ANC) and sulfate. The largest change was in the concentration of nitrate; annual discharge-weighted mean concentrations increased from predefoliation levels consistently less than 5 μeq L−1 to postdefoliation levels greater than 50 μeq L−1. An intensification of acidification was indicated by record-high hydrogen ion concentrations and record-low ANC concentrations. The long-term biogeochemical implications of the infestation are uncertain due to the nonlinearity of the observed responses and unknown patterns of recovery and recurrence.