低温水灌溉对花生根际土壤酶活性和养分含量的影响

摘要

The article systematically studied the effects of irrigation with low temperature water (4℃-16℃)on soil temperature,soil enzyme activity and soil nutrient of peanut rhizosphere at early podding stage under the condi-tion of automatically rainproof shed and cement pool.Result showed that low temperature water irrigation could signif-icantly decrease the temperature of soil layer between 0-30cm,differences among treatments reduced gradually until 72h as the time went on.Irrigation significantly reduced the activity of catalase (CAT),urease (URE),invertase (INV),phosphatase (ACP)of peanut rhizosphere,increased the contents of organic matter,total nitrogen,available phosphorus,available potassium,and hardly influenced the soil alkali -hydrolysable nitrogen and soil pH.The effects on soil temperature,soil enzyme activity and soil nutrient became more obvious with the decrease of water tem-perature.This research provided a better understanding of the effect of low temperature irrigation on production reduc-tion.%在电动防雨旱棚水泥池栽控水条件下，系统地研究了结荚初期4～16℃低温水灌溉对花生根际土壤温度、土壤酶活性和土壤养分含量的影响。结果表明：低温水灌溉显著降低地表至30cm土层地温，随时间推移，不同温度低温水处理间地温差异减小，至72h趋于一致；显著降低花生根际土壤中过氧化氢酶活性、土壤脲酶活性、转化酶活性和磷酸酶活性，提高土壤有机质、全氮、速效磷、速效钾含量，对土壤碱解氮和pH值影响较小。灌溉水温越降低，对土壤温度、酶活性和养分含量的影响越大。研究结果为探明低温水灌溉引起花生减产的原因和合理灌溉提供了理论依据。