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以提高灌溉水利用率为核心 ,以植物生理学和生态学以及树木生长为依据 ,连续 8年对毛白杨速生丰产林节水灌溉的理论与技术进行了较为系统的研究。结果表明 ,利用科学的灌溉阈值 ,抓住关键的灌溉时期 ,确定有效的灌溉范围和经济的灌溉量 ,就可以较少的水分投入获取较高的林木生长量。在春夏干旱季节 (0 5 - 0 6月 ) ,以田间持水量的 5 0 %作为阈值实施灌水 ,具有极显著的近期和后期水分补偿效应 ,与较高灌溉水平 (阈值为 70 % )相比 ,灌溉水利用率提高 46 .80 % ,灌水量减少 2 2 .81% ,材积生长量增加 13.30 % ,经济效益提高 31.2 8%。
Based on plant physiology and ecology and tree growth, the theory and technology of water saving irrigation for fast growing and high yield forest of Populus tomentosa were studied systematically for the purpose of improving irrigation water use efficiency. The results show that using the scientific irrigation threshold, grasping the key irrigation period, determining the effective irrigation range and economical irrigation amount, we can obtain the higher growth rate of forest tree with less water input. In the dry season of spring and summer (0-5 months), irrigation was carried out with 50% of field capacity as the threshold, with extremely significant short-term and late-stage water compensation effects. Compared with the higher irrigation level (70% threshold) The utilization rate of irrigation water increased by 46.80%, the irrigation volume decreased by 22.81%, the volume growth increased by 13.30% and the economic benefit increased by 31.28%.