豆科牧草根际土壤脲酶活性的研究

Studies on urease activities of rhziosphere soil of legume

研究结果表明:土壤脲酶活性与养分含量呈极显著相关,可作为评价土壤肥力的生物学指标;脲酶活性的垂直分布随土层深度而递减;土壤脲酶活性数量随作物生长与根系生物量的增强而增加,与土壤微生物数量显著相关;根际土壤脲酶活性高于近根际土壤;不同种类豆科牧草,根际土壤脲酶活性存在明显差异。深根豆科牧草苜蓿、草木樨可留给深层土壤大量根系残留物,从而有利于提高土壤深层脲酶活性与综合供肥能力。

The research shows that soil urease activities are significantly correlated to the nutrition content, which can be used as the biological index to evaluate the soil fertility. Urease activity decreases gradually as soil becomes deep; soil urease activity amount increases as crop grows and root amount strengthens, which is significantly correlative to the amount of soil microbe. Soil urease activity of rhizosphere is higher than that of non-rhizosphere; soil urease activity of rhizosphere is apparently different in different kinds of Leguminosae herbage. Leguminosae herbage with deep roots such as alfalfa and sweet clover,leaves the deep soil plenty of root residue,which helps to improve the urease activity and soil fertilily of deep soil.