中文摘要：

以30年（1979~2008年）肥料长期定位试验为基础,探讨长期定位施肥对黄土旱塬黑垆土土壤酶活性的影响及不同土壤酶间相关性。结果表明：SNP和MNP处理可提高土酶蔗糖酶活性,比不施肥对照分别增加19.98%、19.14%;土壤脲酶活性单施M效果最佳,较对照提高30.72%,MNP和SNP处理优于其它处理;MNP提高碱性磷酸酶活性的效果最好、增幅196.5%,单施M和SNP效果次之;单施N可提高土壤蛋白酶活性,较对照增加28.3%,而施P有抑制黄土旱塬黑垆土蛋白酶活性的作用。脲酶与碱性磷酸酶呈显著正相关,相关系数为0.7241,过氧化氢酶与碱性磷酸酶、脲酶呈显著负相关。综合考虑,长期有机-无机NP肥配施是促进黄土旱塬黑垆土土壤良性循环、提高耕地质量的有效施肥管理措施。

英文摘要：

Effects of long-term fertilization on soil enzyme activities in dryland black humus soil in the Loess Plateau was studied based on the long-term fertilization experiment from 1979 to 2008.The results showed that nitrogen and phosphorus with farmer manure（MNP）,nitrogen and phosphorus with straw（SNP） could improve the soil invertase activity compared with no fertilizer（control） increased by 19.98%,19.14%.Farmer manure（M） had a great effect on soil urease activities increased by 30.72% compared to the control,next to MNP and SNP.MNP could increase alkaline phos-phatase activities by 196.5% compared with the control,next to M and SNP.Only application of N could increase soil protease activities by 28.3% compared with control,while P could inhibit soil protease activities in dryland black humus soil in the Loess Plateau.There was a significant positive correlation between soil urease and alkaline phosphatase with correlation coefficient of 0.7241,while there was significantly negative correlation between catalase and alkaline phosphatase,urease.Organic-fertilizer（M and S） with NP was an effective practice for dryland black humus soil in the Loess Plateau to promote virtuous circle of soil nutrition and improve the quality of arable land.