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首页> 外文期刊>Journal of Turfgrass Management >Comparative Water Use of Turfgrasses and Ornamental Trees in an Arid Environment
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Comparative Water Use of Turfgrasses and Ornamental Trees in an Arid Environment

机译：干旱环境下草坪草和观赏树木的用水比较

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Monthly evapotranspiration (ETa) of Argentine mes-quite (Prosopis alba Grisebach), desert willow (Chilopsis linearis (Cav.) Sweet var. linearis) and southern live oak (Quercus virginiana Mill., nursery seedling selection) were compared with tall fescue (Festuca arundinacea Schreb.) and common bermudagrass (Cy-nodon dactylon (L.) Pers.) overseeded with perennial ryegrass (Lo-lium perene L.) over a two-year period at a field site in Las Vegas, NV. Immature trees (56.8 L container nursery stock) and tall fescue were grown in 190 L plastic lysimeters in which weekly hydrologic balances were maintained. Evapotranspiration of bermudagrass/rye-grass was estimated from crop coefficients (Kc) and potential evapotranspiration (ETo) predictions. ETa of the trees and tall fescue (L/lysimeter) was shown to increase as the leaching fraction (LF = drainage/irrigation) increased. The ETa data were compared on an area basis by dividing tree ETa by measured basal canopy areas and turfgrass ETa by the land area on which the grass was grown. Highest tree to grass water use ratios were observed when trees (+0.25 LF) were compared to the low fertility bermudagrass/rye-grass and the lowest water use ratios were observed when comparisons were made with tall fescue underthe highest irrigation treatment (+0.25 LF). During the active growing season, tree to grass (bermudagrass/ryegrass low fertility) water use ratios in the range of 2.0 to 4.0 were observed with values dropping to approximately 1.0 during winter months. Based on ETa-basal canopy area-canopy volume relationships, extrapolation of the data to mature size trees suggested even larger tree to grass water use ratios.
机译：比较了阿根廷中段（Prosopis alba Grisebach），沙漠柳树（Chilopsis linearis（Cav。）Sweet var。linearis）和南部活橡树（Quercus virginiana Mill。，苗圃选择）的月蒸散量（ETa）与高羊茅（在内华达州拉斯维加斯的一个野外场地上，在两年的时间里，多年生黑麦草（Lo-lium perene L.）和普通的百慕大草（Cy-nodon dactylon（L.）Pers.。）未成熟的树木（56.8升集装箱苗木）和高羊茅在190升塑料溶渗仪中生长，每周保持水文平衡。根据作物系数（Kc）和潜在的蒸散量（ETo）预测估算了百慕大/黑麦草的蒸散量。树木和高羊茅的ETa（L /溶渗仪）显示出随着淋溶率（LF =排水/灌溉）的增加而增加。通过将树木的ETa除以测得的基础冠层面积，将草木的ETa除以种植草的土地面积，可以将ETa数据按面积进行比较。将树木（+0.25 LF）与低肥力百慕大草/黑麦草进行比较时，观察到最高的树与草用水比率;而在最高灌溉处理（+0.25 LF）下与高羊茅草进行比较时，则观察到最低的用水比率。 ）。在活跃的生长季节中，观察到树木与草（草木/黑麦草的低肥力）用水比率在2.0到4.0之间，而在冬季，该比率下降到大约1.0。根据ETa-基础冠层面积-冠层体积的关系，将数据外推到成熟大小的树木上，则表明树与草的用水量甚至更大。

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