Invasive effects of Ageratina adenophora (Asteraceae) on the changes of effective functional bacteria, enzyme activity and fertility in rhizosphere soil ecosystem.
In the study, the soil functional bacterial communities were studied and compared using plate cultivation method with selective media, at the same time we compared the activity of the soil enzyme and the soil physical and chemical properties in five different type of soil area (divided following the invasion of Ageratina adenophora). It was found that the number of the soil functional bacteria, the activity of the soil enzyme, and the soil nutrient level (except for the soil N and the soil K) of the rhizosphere soil in heavily invaded area were extreme higher than the other area. The content of the Organic-phosphorus-dissolving bacteria is 3.0 times in heavily area more than the content in the newly invaded area, is 1.8 times more than the content in the native plants area, and is 22.2 times more than the content in the bare soil area. At the same time, after analyzing the correlations coefficient among soil microbe groups, soil enzyme and soil nutrient we found that there were significant positive correlations between soil enzymatic activities and soil nutrient level (except that the soil N and soil K), also there were significant positive correlations between soil functional bacterial and soil nutrient level (except that the soil N and soil K). The correlations coefficient between the azotobacter and the soil N is 0.922. The effects of invasive plants on the soil is an important part of the invasive mechanism, the invasive of the Ageratina adenophora increase the number of the soil functional bacterial and the activity of the soil enzyme, which made the soil nutrient level changed at the same time, these changes may raise its competent ability compared to the native plants. This study provided a basical theory for further exploring the microorganism mechanism of its invasion.
国家科技期刊平台
NSTL
万方数据
维普
