麦茬处理方式对夏玉米(Zea mays L.)根际生物活性的影响

The effect of wheat stubble treatment on the activities of microorganisms in the rhizosphere of summer maize(Zea mays L.)

通过两年3点的大田试验,研究了不同麦茬处理方式(平茬、立茬、除茬)对夏玉米(Zea mays L.)根际生物活性的影响。结果表明:不同麦茬处理的夏玉米根际微生物数量、土壤蛋白酶和脲酶活性均呈先升后降的变化趋势,且在吐丝期达到最大值,但在不同生育时期,不同处理间有所差异,趋势为平茬>立茬>除茬,且苗期差异较大,后期逐渐减小。麦茬处理方式对夏玉米田土壤碳通量的影响也表现出同样趋势。

The effect of different winter wheat residue treatments （returning straw, RS ; high stubble with mulched, HS and zero stubble, ZS） on activities of microorganisms in rhizosphere of summer maize （ Zea mays L. ） was studied in 2005 and 2006 at 3 places via field testing. The results indicated as follows： The content of rhizosphere microorganism and enzyme activities of protease and urease in soil of 3 treatments above increased first , and then descended and reached maximum at silking stage. Among the treatments ,these indexes of RS were the higest and these of ZS were the lowest. Furthermore the differences between treatments during growth periods were different ： It was highest in the seedling stage and then the differences reduced with the increase of growth period . The changes in soil CO2flux showed the similar trend to indexes mentioned above.