“黑麦草-水稻”草田轮作系统的根际效应3.黑麦草根系对土壤生物性状的影响

Rhizosphere Effects in Ryegrass Rice Rotation System 3 The Effects of the Root of Ryegrass to Soil Biological Character

在证实冬种黑麦草改善土壤理化性状的同时，研究对土壤生物性状的影响，结果表明：冬种黑麦草增加了土壤酶的活性，使脲酶活性提高了２．７５倍，转化酶活性提高了９２．６％；土壤微生物生物量增加１３倍；改善了土壤的微生物区系，细菌数量增加１．２倍，放线菌数量增加３．４倍，真菌数量下降了４４％．这些生物性状的改善，对提高地力和后作水稻的生长和发育具有良好的作用．

Ryegrass winter cropping increased soil urase activity and zymose activity for 2 75 times and 92 6%,respectively.Soil microbial biomass also increased 13 times,and the numbers of bacteria and actinomycetes increased 1 2 times and 3 4 times, respectively,while that of fungus reduced by 44% under ryegrass winter cropping.