Effect of removal of Juniperus ashei on evapotranspiration and runoff in the Seco Creek Watershed
Effect of removal of Juniperus ashei on evapotranspiration and runoff in the Seco Creek Watershed
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清除杜松对塞科溪流域蒸散量和径流的影响
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
P. Wright
中科院分区：
文献类型：
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作者：
W. Dugas;R. A. Hicks;P. Wright
用浅根草本植物取代深根木本植物可能会影响流域的水平衡。本研究的目的是测量在美国德克萨斯州Uvalde县东北部两个相邻的、未重复的15公顷区域（称为未处理和处理）中，去除一种单独树种刺柏（Bucch.）对径流（RO）和蒸散（ET）的影响。1991年至1995年，使用Bowen比值-能量平衡法测量了两个区域的日蒸散量，变化范围为接近0至6 mm/d。1992年9月，用链锯锯断处理区内所有高于0.5 m的石首树。在预处理期间（1992年9月之前）和处理后期间，处理后的ET与未处理ET的斜率均为~ 1，这表明在整个测量期间，去除刷子对ET没有显著影响。在预处理2年期间，处理地区的平均日ET比未处理地区低0.05 mm/d，而在处理后3年期间则低0.12 mm/d。在去除青霉后的前2年，ET差异（未处理减去处理）为0.3 mm/d，此后逐渐减小。去除率对RO的影响不一致。植被管理在实施处理后的头两年减少了蒸散发，从而增加了这些牧场在短期内产生更多水量的潜力。
The water balance of a watershed may be affected by replacing deep‐rooted woody species with shallow‐rooted herbaceous vegetation. The objective of this study was to measure the effect of removing an individual species of tree, Juniperus ashei (Bucch.), on the runoff (RO) and evapotranspiration (ET) from two adjacent, unreplicated 15‐ha areas (termed untreated and treated) in northeast Uvalde County, Texas, U.S.A. Daily ET from the two areas, measured from 1991 through 1995 using the Bowen ratio–energy balance method, varied from near 0 to 6 mm/d. All J. ashei taller than 0.5 m were cut with a chain saw in the treated area in September 1992. During both the pretreatment period (prior to September 1992) and the posttreatment period, the slope of treated ET as a function of untreated ET was ∼1, suggesting that for the entire period of measurements, brush removal had no significant effect on ET. Average daily ET from the area to be treated was 0.05 mm/d lower than that from the untreated area during the 2‐year pretreatment period, while it was 0.12 mm/d lower during the 3‐year posttreatment period. The ET difference (untreated minus treated) was 0.3 mm/d in the first 2 years following removal of J. ashei and decreased thereafter. Removal of J. ashei had no consistent effect on RO. Vegetation management increased the potential for greater water yields in the short term from these rangelands by decreasing ET for the first 2 years after imposition of treatment.