沙地毛白杨速生丰产林节水灌溉的研究

Study on water saving irrigation in intensive plantation of Populus tomentosa on sandy land

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%。

Taking the utilizing rate of irrigation water as the core and according to plant physiology and ecology and growth of trees, the theory and technology of water saving irrigation in Populus tomentosa intensive plantation was studied systematically for eight years in succession. The results showed that it could get more growth of trees with less water and achieve water saving irrigation by means of scientific soil moisture threshold and taking the key season and define the effective range and economic quantity for irrigation. During the dry season in spring and summer (May to June), it showed obvious compensate effects in contemporary and later stage irrigation with 50% of field capacity as the soil moisture threshold . Compared with the high level irrigation, the utilizing rate of irrigated water raised by 46.80% and the quantity of water for irrigation decreased by 22.81% while the volume of timber increased by 13.30% and the economic benefit increased by 31.28%.