改性荒漠沙在甘肃河西荒漠区绿化造林工程中的应用研究

针对甘肃河西荒漠区干旱少雨、水资源缺乏的现状,以典型荒漠植物胡杨、密胡杨为试验对象,通过分析铺沙处理和控灌对其幼苗生长量、土壤含水率变化的影响,研究改性荒漠沙在干旱荒漠区绿化造林中的适用性。结果表明:改性荒漠沙的应用能够起到防蒸发、保墒节水的作用,有效促进胡杨幼苗的生长发育;在幼苗栽植第2年,顶部铺沙处理和控灌,可大幅提高0~40 cm土层的土壤含水率,试验组胸径、地径较对照组提高66.53和46.74,7月、8月、9月效果明显,并与常规灌溉相比,灌溉用水减少66.7,节水效益显著。研究结果对甘肃河西干旱荒漠区绿化造林的节水灌溉具有较强的现实指导意义。

Application of Modified Desert Sand in Afforestation Project in Desert Area of Gansu Hexi Corridor

In view of the current situation of drought,less rain and lack of water resources in the western desert area of Gansu province,the applicability of modified desert sand in afforestation in arid desert areas was studied by analyzing the effects of sand-laying treatment and irrigation control on seedling growth and soil moisture content of populus euphratica and populus talassica×p.euphratic as typical desert plants.The results showed that the application of modified desert sand could prevent evaporation,conserve water and effectively promote the growth and development of populus euphratica seedlings.In the second year of seedling planting,top sand treatment and irrigation control could significantly improve the soil moisture content in the 0~40 cm soil layer.Compared with the control group,the chest diameter and ground diameter in the test group were 66.53%and 46.74%higher than those in the control group.The results of the study have a strong practical guiding significance for the water-saving irrigation of afforestation in arid desert areas in Hexi of Gansu province.