Effects of Different Irrigation Regimes on Spatial-Temporal Distribution for Activity of Soil Enzyme

Shimai15 was researched material,the activity of soil enzyme can be influenced by the different irrigation systems.This study examines the effects of different irrigation treatments on vertical distribution of activity of alkaline phosphatase,urease and saccharase in soil layer 0-200 cm in winter wheat under field condition.Irrigation treatments consisted of three irrigation patterns that is,without irrigation in spring (W0),75 mm irrigation at jointing stage in spring (W1),three 75 mm irrigations at three growth stages (double ridge,booting and grain-filling stages) in spring (W3).The results showed that with the decreasing of the irrigation times in spring,it was decreased that the activity of alkaline phosphatase and saccharase of winter wheat in soil layer of 0-80 cm at middle and late stages,but it increased beneath the soil layer of 80 cm.It was decreased that the activity of urease of winter wheat in soil layer of 0-40 cm,but it increased in the soil layer of 40-120 cm.The order of grain yield (from high to low) was W3,W1 and W0.The final water use efficiency (WUE) of W1 treatment was the highest of all.So appropriate deficit irrigation in spring could improve the activity of soil enzyme in deep layers during growth at middle and late stages,and partially compensated that the decrease of activity of soil hydrolase leaded to nutrient short supply in shallow soil layers,which was likely important reason to realize the unity of water saving and high yield.