Reforestation and the reduction of water yield on the Southern Piedmont since circa 1940
Reforestation and the reduction of water yield on the Southern Piedmont since circa 1940
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自 1940 年左右以来，南部皮埃蒙特地区的植树造林和水量减少
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
B. Hoag
中科院分区：
文献类型：
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作者：
S. Trimble;F. Weirich;B. Hoag
在20世纪，南皮埃蒙特经历了广泛的农田恢复，行作物被森林和牧场所取代。在1919-1967年期间，10个总面积为54,020公里的连续河流流域有10%至28%的面积重新造林。在同一时期，根据回归和双质量分析，产水量下降了3 ~ 10 cm。这些水量的减少构成了年流量的4%到21%的减少，对大多数流域来说具有统计学意义。森林减少的水量在干旱年份往往比湿润年份更大。在本研究的尺度上，再造林程度与产水量减少之间几乎没有关系，但当我们的数据被纳入数据集时，我们的数据与整体模型的方差远小于通用集。纳入我们的结果扩展了通用模型的范围和预测能力，使其在水量规划方面具有更大的效用。
The southern Piedmont has undergone extensive cropland reversion during the twentieth century with row crops being replaced by forest and pasture. Ten continguous river basins with a total area of 54,020 km 2 had 10 to 28% of their respective areas reforested during the period 1919–1967. During the same period, water yield decreased 3 to 10 cm according to both regression and double-mass analysis. These reductions in water yield constituted a 4 to 21% decrease in annual stream discharge and were statistically significant for a majority of the basins. The reduction of water yields by forests tends to be greater for dry years than for wet years. There was little or no relation between the degree of reforestation and reductions of water yield at the scale of this study, but when our data are included with the universe of data, the variance of our data from the overall model is much less than in the universal set. The inclusion of our results extends the range and predictive power of the universal model, giving it greater utility for water yield planning.