|
With the rapid increase in population and people's living standards improve, people's food, vegetables, fruits and other increased demand. However, due to urban sprawl, desertification and other issues, arable land is decreasing, continuous cropping issue has become urgent problem. Soil is not only an important component of the soil, or soil material and energy flows of the prime movers in the process of soil formation and development plays an important role. Changes in soil microbial communities and populations to some extent, reflect the trend of soil quality, Therefore, this study intends to soil microbial communities and populations from changing perspectives on the causes of soybean continuous cropping obstacles in order to investigate the mechanism of soybean continuous cropping and its control to provide reference data. In this experiment, the Land of corn, 1 year soybean Land (both black) for the tested soil, the soil, respectively, stubble, soybean seeds treated with different effects of different sources of microbial effects on soybean growth, cropping cultivation on soil impact of changes in flora and evaluation method using Biolog microbial community functional diversity of microbial changes in the role of soybean continuous cropping obstacles discussed. The results showed that: (1) maize soil sterilization, seeds unpasteurised (C group) and cropping soybeans (H group) root length significantly different, indicating that microbial seed sources and cropping inhibit root growth. Sterile control group (A), maize soil sterilization, seeds unpasteurised (C group), a year soybean soil is not sterilized soil, seed disinfection (E group), cropping soybeans (H group) and soybeans a year soil (G group) plant fresh weight difference was significant, indicating cropping planting on plant growth inhibition. (2) one year cropping soybeans and soybean planting soil microorganisms difference was not significant, but the floristic composition has changed, blue Streptomyces (S.caeruleus), Fusarium (Fusarium Link) The number has increased significantly. Rhizosphere microbial composition in the relative number of higher fungi, soil microbial composition of the fungal type conversion. (3) evaluation method by using Biolog microbial community functional diversity, which features a carbon source discrimination results showed that: in the case of continuous cropping of soybean, soybean rhizosphere soil microbial carbon sources using mainly from carbohydrates, amino acids, organic substances to acids, benzene acids using the conversion. Plant root exudates is one of microbial community carbon source, test results showed that: planting soybean rhizosphere microbial community carbon source utilization and corn on soil microbial community carbon source utilization compared to terephthalic acid and organic acid substances utilize more.
|