连作草莓土壤微生物区系动态的研究

再植病害是制约草莓生产可持续发展的严重障碍,土传根病加重是草莓再植病害的主要表现。通过日光温室试验研究了连作草莓根际土壤和根表微生物总量动态、种群结构的变化。结果表明:连作处理根际土壤和根表真菌总量高于正茬处理。细菌、放线菌总量则低于正茬处理。生育期结束时,正茬处理根际土壤和根表的细菌与真菌总量比下降了57 3%和47 5%,连作处理则分别下降了93 2%和63 1%;连作处理根表和根际土壤放线菌与真菌总量比增高了42 6%和1 26倍,正茬则增高了8 25倍和4 75倍。

Study on dynamics of soil microorganisms under strawberry (Fragria ananassa Duch) continuous cropping

Replant disease was a serious problem for the sustainable production of strawberry. Root diseases were the most important characteristic of strawberry replant diseases. The population of microbes in rhizosphere, and root surface were affected by strawberry replanting. In the replanting treatment of greenhouse trial, the gross amount of fungi in rhizosphere and root surface were more than first-planting treatment. On the contrary, the gross amounts of bacterium and actinomycetes in replanting treatment were less than that in first-planting treatment. At the end of the growing period, the proportion of bacterium to fungus in rhizosphere and root surface decreased by 57.3% and 47.5% respectively in first-planting treatment, while the numbers were 93.2% and 63.1% in replanting treatment. The proportion of anctinomycete to fungus in rhizosphere and root surface increased by 4.75 and 8.25 times respectively in first-planting treatment, while the numbers were 42.6% and 1.26 times in replanting treatment.