关键词: 大蒜, 连作, 土壤微生物, 土壤酶活, 养分转化

Abstract: In order to explore the causes of continuous cropping obstacles in garlic, this paper selected the soils in which garlic was grown for 0 year (control), 5 years, and 10 years as research objects, and researched the changes of soils nutrients, soil microorganism quantity and enzyme activities. The results showed that with the increasing of continuous cropping years, garlic yield dropped significantly compared with the control. The production decreased by 31.1% and 40.8% in 5 years and 10 years of continuous cropping soil, respectively. Soil pH increased significantly, while soil available potassium, ammonium nitrogen, nitrate nitrogen and soil organic matter decreased under long-term continuous cropping. The quantity of bacteria and actinomyces decreased, while that of fungi increased．The activities of urease, saccharase and catalase in soil tended to be decreased within 10 years of continuous cropping, indicating that long-term continuous cropping altered the soil nutrient. In conclusion, after long-term continuous cropping, the yield of garlic and enzyme activity decreased, soil pH increased, and the microorganism composition and structure were altered. It is suggested that organic fertilizer was applied to improve the enzyme activity and balance the soil microbial community structure soil property.

Key words: garlic, continuous cropping, soil microorganism, soil enzyme activity, nutrient transformation