保水剂用量对土壤水分的影响  

Effects of the application rate of superabsorbent on water characteristics of soil

作　　者：宋海燕[1] 汪有科[1,2] 汪星[1] 汪勇[1] 杨直毅[2] 蒋中波[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]中国科学院水土保持研究所,陕西杨凌712100

出　　处：《干旱地区农业研究》2009年第3期33-36,共4页Agricultural Research in the Arid Areas

基　　金：陕西半干旱区山地特色果品综合节水技术研究与示范(2007BAD88B05)

摘　　要：为确定保水剂的合理用量,于2008年5月在陕西米脂县进行保水剂不同用量玉米盆栽试验研究。盆栽试验设置了保水剂不同用量(0、30、40、50、60 g)五个处理及保水剂与风干黄绵土配比用量(0、0.05%、0.10%、0.15%、0.20%、0.30%)6个处理,分别研究了保水剂不同用量与土壤水势、土壤含水量的关系及对土壤持水时间的影响。试验结果表明,土壤含水量高(>18%)时各处理土壤水吸力十分接近,在土壤吸水力相同时,随着保水剂用量的提高其土壤含水量也随着提高;保水剂用量越大的处理玉米存活的时间也越长,0.20%和0.30%处理玉米存活时间较对照长3 d;综合分析表明本试验中保水剂与黄绵土配比0.20%和0.3%应用效果较好。In order to determine the amount of Superabsorbent, a pot experiment was conducted in Mizhi County, Shaanxi Province to study different amount of superabsorbent in May 2008. The experiment set different amount of Superabsorbent （0, 30, 40, 50 and 60 g） in five treatments and the ratio of Superabsorbent and loessal soil（0, 0.05%, 0. 10%, 0. 15%, 0.20% and 0.30%）in six treatments, to find out the relation of amount of superabsorhent, soil water suction and soil water content and the influence of different amount of superabsorbent on soil retention water time respectively. The results showed that, when high soil water content（ 〉 18% ）, soil water suction of all treatments come to approach, when same soil water suction, soil water content would be longer when increasing the amount of superabsorbent; The survival time of maize were longer when the amount of superabsorbent were higher, the survival time of maize of both 0.2% and 0.3 % treatments were 3 days longer compared with the control treatment; Integrated analysis indicated that the of superabsorbent and loessal soil with the ratio of 0.2 % and 0.3 % achieved remarkable effect in the experiment.

关 键 词：保水剂用量 土壤水吸力 土壤含水量 黄绵土 

分 类 号：S157.9[农业科学—土壤学]