CAJ | 학술논문

为了分析保水剂对土壤氮素淋溶效应和土壤脲酶活性影响,通过模拟试验,对施用同量尿素条件下,三种不同类型高分子保水剂(聚丙烯酸钠保水剂、有机-无机复合保水剂、腐植酸型保水剂)对尿素淋溶和土壤脲酶活性进行比较.多次灌水淋溶实验表明,三种保水剂都明显降低了土壤尿素淋失,保肥效果明显.在前三次灌水淋溶中,三种保水剂施用的土壤脲酶活性略高于未施尿素的对照,之后灌水时基本相同,说明保水剂对脲酶活性有一定促进作用,有利于植物更好的吸收氮素.随灌水次数增加,所有处理的土壤脲酶活性都有明显减少,与淋溶液氮素淋出量趋势相同.其中施用聚丙烯酸钠盐保水剂降低氮素流失,提高肥料利用效率效果较优.
위료분석보수제대토양담소림용효응화토양뇨매활성영향,통과모의시험,대시용동량뇨소조건하,삼충불동류형고분자보수제(취병희산납보수제、유궤-무궤복합보수제、부식산형보수제)대뇨소림용화토양뇨매활성진행비교.다차관수림용실험표명,삼충보수제도명현강저료토양뇨소림실,보비효과명현.재전삼차관수림용중,삼충보수제시용적토양뇨매활성략고우미시뇨소적대조,지후관수시기본상동,설명보수제대뇨매활성유일정촉진작용,유리우식물경호적흡수담소.수관수차수증가,소유처리적토양뇨매활성도유명현감소,여림용액담소림출량추세상동.기중시용취병희산납염보수제강저담소류실,제고비료이용효솔효과교우.
Chemical agent application is an important way to decrease nitrogen fertilizer losing and raise the use efficiency. In order to analyze the inference of super absorbent polymer (SAP)on nitrogen eluviations and the urease activity of soil,it was used simulation experiment to study the effects of three kinds of SAP,including polyacrylic acid SAP, organic-inorganic hybrid SAP and humic acid-contained SAP,on usea eluviations and the urease activity of soil. Under same level of urea fertilizer application, multiple irrigation eluviations experiment was shown that three kinds of SAP all strongly restrained the leaching loss of urea in soil, and effect of fertilizer maintaining is clearn. In the former three times, the activity of urease in soil applying WRA slightly higher than the sample's, while after that it almost same. It means that SAP has enhance effect on activity of urease,which is good for plants to absorb nutrient. The activities of urease of all the samples are lower with the time, and the trend is the same as the Leaching Loss of Urea. And effect of nitrogen maintain and inhibition of activity of Urease on the sample applying the polyacrylic acid SAP is the most obviously.