文档介绍：2009 年 10 月第三届全国农业环境科学学术研讨会论文集 301
保水剂对土壤氮素淋溶及脲酶活性的影响45
车明超,黄占斌,王小茜,李文颖,锅圆,吴鹏
(中国矿业大学(北京)化学与环境工程学院 100083)
摘要:施用化学各处理的土壤脲酶活性与氮素淋溶量达到了显著正相关是减小土壤氮素淋溶和提高氮素利用效率
的重要途径。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。本文通过模拟试验,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。多次浇水淋溶实验表明,三种保水剂都明显降低了土壤尿素淋失量,8 次浇水后氮素淋溶累积量分
别比对照减少 %、%、%。多次浇水中保水剂对氮肥淋溶量动态变化表明,保水剂减小氮素淋溶损失
的重要机理是保水剂具有缓冲氮素释放作用;保水剂处理有效促进土壤脲酶活性,土壤脲酶活性与氮素淋溶量显著
正相关。相对而言,聚丙烯酸钠盐保水剂降低氮素流失,提高氮肥利用效率效果较优。
关键词:保水剂; 氮素; 尿素; 淋溶; 脲酶
Effects of SAP Application on Nitrogen Eluviations and the Urease Activity of Soil
CHE Ming-chao,HUANG Zhan-bin,WANG Xiao-qian,LI Wen-ying,GUO Yuan,WU Peng
(School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing 100083, China)
Abstract: 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-anic hybrid
SAP and humic acid-contained SAP, on urea eluviations and the urease activity of soil. Under same level of urea fertilizer
application, the experiment was shown that three kinds of SAP all strongly restrained the leaching loss of