摘要
合理的保水剂和聚丙烯酰胺(PAM)用量能够减缓土壤水分的蒸发,增加土壤水分有效量,对干旱地区或者土壤缺水条件下的植物生长具有重要作用。通过模拟试验,分别从累积蒸发量、含水率变化及蒸发失水比等方面进行分析比较,定量研究了保水剂与PAM用量对人工土壤颗粒水分蒸发的作用规律。结果表明:保水剂和PAM对蒸发确有抑制作用,随着PAM用量的增加,累积蒸发量和蒸发失水比均呈现降低趋势,其中PAM用量为2 g/m2的处理水分蒸发量最小,保水效果最好;而随着保水剂用量的增加,累积蒸发量与蒸发失水比呈现先增加后减少的趋势,当保水剂用量超过175 g/m2后对蒸发的抑制作用开始显现。
Reasonable dosage of hydrogel and polyacrylamide(PAM)can reduce the evaporation of soil moisture and increase effective soil moisture.It has important functions to the growth of plants in the arid area or in water-deficient soil.The paper analyzed the accumulated evaporation,moisture content and evaporation water loss ratio respectively through simulation tests and quantitatively studied the law and function of hydrogel and PAM application rates to water evaporation of artificial soil particle.The outcomes show that a)the restraining impacts of hydrogel and PAM on soil water evaporation are obvious.Along with the increase of PAM dosage,the accumulated evaporation and evaporation water loss ratio show the trend of decrease,of which,the PAM dosage of 2 g/m^2 has the minimum evaporation,showing the best effect of water conservation.b) Along with the increase of hydrogel dosage,the accumulated evaporation and evaporation water loss ratio show the trend of first increase then decrease.When the hydrogel dosage exceeds 175 g/m^2,the restraining impacts on evaporation become obvious.
出处
《中国水土保持》
2015年第2期44-47,69,共4页
Soil and Water Conservation in China
关键词
保水剂
PAM
人工土壤
累积蒸发量
蒸发失水比
hydrogel
PAM
artificial soil
accumulated evaporation
evaporation water loss ratio
