不同培肥方式对盐碱土脲酶和过氧化氢酶活性的影响

Effects of Different Fertilization Systems on the Activities of Urease and Catalase in Saline Soil

为了提高盐碱土壤肥力,提升土壤中脲酶和过氧化氢酶的活性,通过定位试验,研究了有机-无机复混肥、生物肥、有机肥、厩肥、化肥5种肥料对土壤脲酶和过氧化氢酶活性的影响,并对这2种酶活性与土壤养分因子的相关性进行研究。结果表明,5种培肥方式对盐碱土中脲酶活性均有明显提高,并切脲酶活性都呈现先上升后下降的趋势,有机-无机复混肥对土壤中脲酶活性提高效果最为显著,是对照的1.421倍,有机肥和生物肥分别是对照的1.335倍和1.322倍。各种处理对过氧化氢酶活性的影响尽管并不显著,但与对照相比较,均有所提高。通过对这2种酶活性与有机质、全氮、碱解氮、全磷、速磷、速钾的相关性研究得出,速效磷和全氮对脲酶活性影响最大,相关系数分别达到了0.8737和0.8451,过氧化氢酶与有机质和碱解氮的相关系数达到了0.796和0.754。

By localized experiments, this paper studied the effects of different fertilization systems （organic compound fertilizer, biological fertilizer, organic fertilizer, stable manure and fertilizer） on activities of urease and catalase in soil, and also studied on the correlation between soil enzyme activities and soil nutrient factors, which was going to improve the fertility of saline soil and the activity of urease and catalase in saline soil. The results showed that, all these five kinds of fertility betterment could improve the urease activities obviously, and it presented a trend of first rise and then drop, the effect of organic compound fertilizer on urease activities was the most significant, increased 1.6 fold compared to the control group. Biological fertilizer and organic fertilizer increased 1.335 fold and 1.322 fold compared to the control group. Though the effects of all treatments on catalase activities were not obvious, but were all somewhat increased. Through the study on the correlation between soil enzyme activities and soil nutrient factors, we drew a conclusion that available P content and total N content had most important influence on urease activities, correlation coefficient reached 0.8737 and 0.8451, correlation coefficient between catalase activities and organic content, available N content was respectively 0.796 and 0.754.