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通过测定元谋干热河谷地区几种相思和桉树自然条件下的蒸腾速率及其相关因子 ,分析了这些树种水分消耗量的日变化情况。根据水分消耗量公式计算 ,发现马占相思、肯氏相思、赤桉和窿缘桉、大叶相思、厚荚相思、绢毛相思、柠檬桉水分消耗最大、最小值的时间。结果表明 ,各树种全天水分消耗量依次为窿缘桉、肯氏相思、柠檬桉、赤桉、厚荚相思、绢毛相思、马占相思、大叶相思。此外 ,还预测了在 1.5m× 2m、2m× 2m、2m× 3m等 3种不同造林密度下 ,各树种每公顷的水分消耗量 ,水分消耗量最大的窿缘桉分别为 1876 . 81kg、14 0 7.75kg、96 8.12kg ;水分消耗量最小的大叶相思分别为 2 6 0 .77kg、195.58kg、130 .33kg
The diurnal variations of water consumption of these species were analyzed by measuring the transpiration rate and its related factors in several natural conditions of Acacia and Eucalyptus in Yuanmou dry-hot valley. According to the calculation formula of water consumption, it was found that Acacia mangium, Kenwood Acacia, Eucalyptus grandis and Eucalyptus grandis, Acacia auriculiformis, Acacia crassicarpa, Elaeagnus angustifolia, and Eucalyptus grandis had the maximum and minimum water consumption time. The results showed that the water consumption of all species in succession was Eucalyptus grandis, Kenx aconite, Eucalyptus citriodora, Eucalyptus grandis, Acacia crassicarpa, Amorpha fruticosa, Acacia mangium, Acacia macrostachya. In addition, the water consumption per hectare for each species under the three different planting densities of 1.5m × 2m, 2m × 2m, 2m × 3m was also predicted. The maximum value of water consumption was 1876.81kg, 14kg 0 7.75kg, 96 8.12kg; the largest water consumption of Acacia aurea were 26.077kg, 195.58kg, 130.33kg