前言从微生物生态学的角度来说,在自然土壤(森林土壤、荒地土壤)中,由于土壤病原菌与很多植物以及其他土壤微生物间保持协调生存,所以土壤病害不至于大量发生。但是当人类为了保证粮食的生产,进行单一的作物种植时,这种自然的生态体系就被破坏了。这样,原来在自然植被下进行协调生存 Preface From the perspective of microbial ecology, soil diseases do not occur in large quantities in natural soils (forest soils and wasteland soils) due to the coordinated existence of soil pathogens with many plants and other soil microorganisms. But when human beings plant single crops to ensure the production of grain, the natural ecosystem is destroyed. In this way, the original coordination in the natural vegetation survive