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在集约栽培的杨树人工林中进行小区灌溉试验,研究了不同供水处理下林木生长和水分生理指标的变化,分析了田间供水量、蒸腾耗水量和材积产量的关系。结果表明,林木蒸腾耗水量和材积年产量均随供水水平的高低而增减。5年生杨树人工林(林行距3×6 m)在5—10月的蒸腾耗水量约602.6—879.2mm,林木生长1m~3 材积需蒸腾消耗180.0—215.0 t水。作者还用多种模式分析了田间供水量与材积产量的相关关系,提出了估算杨树人工林需水量的方法和 Ⅰ-69杨人工林需水量表。
Community-based irrigation experiments were conducted in intensively cultivated poplar plantations to study the changes of tree growth and water physiological indices under different water supply treatments. The relationships between field water supply, transpiration water consumption and yield were analyzed. The results showed that both the transpiration water consumption and the annual volume of forest volume increased or decreased with the level of water supply. The 5 year-old poplar plantation (forest row spacing 3 × 6 m) transpiration water consumption in May-October about 602.6-879.2mm, timber growth 1m ~ 3 volume required transpiration consume 180.0-215.0 t water. The author also analyzed the correlation between field water supply and volume production using various models and proposed a method to estimate the water demand of Poplar plantations and the water requirement scale of I-69 Yang plantation.