摘要
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。
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 humie 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 Less of Urea. And effect of nitrogen maintain and inhibition of activity of Urease on the sample applying the polyaerylie acid SAP is the most obviously.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2010年第B03期93-97,共5页
Journal of Agro-Environment Science
基金
国家自然科学基金(40971164)
黄土高原土壤侵蚀与旱地农业国家重点实验室基金课题(10501-258)
关键词
保水剂
氮素
尿素
淋溶
脲酶
super absorbent polymer（SAP）
nitrogen
urea
urease
eluviations
