玉米根际与非根际土壤中4种原生动物分布特征

Distribution of Four Protozoan Genera in Rhizosphere and Non-rhizosphere Soil of Corn

原生动物在土壤中是一类极其重要的生物。通过调查玉米根际和非根际土壤中 4种原生动物的动态分布发现 :仅在玉米抽雄时期 ,根际土壤中 4种原生动物总数是非根际土壤 (R/S)中的 1.6倍 ,而在其它生育时期没有显著的根际效应。不同的原生动物的根际效应差异很大 ,肾形虫在抽雄期R/S比接近 90 ;变形虫在吐丝时期表现出一定的根际效应 ;波豆虫在大喇叭口时期表现出比较强烈的根际效应 ,但在抽雄期则表现出十分强烈的负根际效应 ,根际土壤中波豆虫数量不到非根际土壤的 10 % ;尾滴虫在玉米整个生育时期都表现出微弱的根际效应。

Protozoa is one group of important organisms in soil. This study focused on the distribution features of four protozoa in corn rhizosphere and nonrhizosphere soils. The total number of the four protozoa in rhizosphere soil was about 1.6 times of that in nonrhizosphere soil at 52 days after sowing. However, there is no significant rhizosphere effect at other growing periods of corn. The four protozoa had different changing patterns in rhizosphere and nonrhizosphere soil. About 90 times more Colpoda were determined in rhizosphere than in nonrhizospher at 52 days after sowing. There were more Amoeba in rhizosphere than in nonrhizosphere at 74 days after sowing. Much more Bodo were found in rhizosphere at 32 days after corn sowing. However, the number of the Bodo in rhizosphere soil was only 10% of that in the nonrhizosphere soil at 52 days after sowing. Rhizosphere always contains more Cercomonas than nonrhizosphere within the whole growing season of corn. The essentiality and influencing factors of protozoa distribution in rhizosphere soil were also discussed in this paper.