摘要： 研究了不同种植密度对小麦豫麦49-198根际土壤微生物数量及土壤酶活性的影响,结果表明,根际土壤细菌在拔节和抽穗期数量较多,而放线菌、真菌在开花期数量最多。根际细菌数量、放线菌数量及土壤蛋白酶活性、脲酶活性随着群体密度的增加呈单峰曲线变化,以基本苗150×104株/hm2或225×104株/hm2处理最高;真菌数量则随密度的增加而减少。随着种植密度的增加,微生物数量及酶活性与产量的变化趋势相一致,表明微生物和酶活性增加一定程度上有助于提高作物产量。

关键词: 小麦, 密度, 微生物, 土壤酶

Abstract: The dynamics of the number of microbes in rhizosphere of wheat with different planting densities was studied in this paper. The results indicated that the amount of rhizosphere soil bacteria was attained the higher value in jointing and heading stage.The maximum population of actinomyces and fungi was observed in anthesis stage.The change of bacterium population in the rhizosphere showed a single-peaked curve with the increase in planting density.The maximum populations were observed at planting densities of 150×104/ha or 225×104/ha.The population of actinomyces and the activity of urease and protease had the same trend to that of the bacteria.However,the fungus population decreased with the increase of planting density.The correlation between yield and the microorganism population and enzyme activity in soil showed that the increase in microorganism population would benefit the wheat grain yield.

Key words: Winter wheat, Planting density, Microbe, soil enzyme activity

中图分类号: 

• S512.1+1