关键词: 烤烟, 烤烟, 氮素形态, 产量, 质量

Abstract:

In order to investigate the effects on soil nutrients and enzyme activities of different land use patterns in the suburban of Chongqing, the author analyzed the soil nutrients content and enzyme activities under different land use patterns with the methods of collecting field samples and laboratory analysis. The results indicated that the soil nutrients and enzyme activities had obvious differences among the land use patterns. The content of organic matter and alkali-hydro nitrogen were the highest in the three different soil layers of paddy field; phosphorus was the highest in the layer of 0-20 cm and 20-40 cm of upland field and performed: upland field>vegetable field>paddy field>orchard field, then 40-60 cm performed: upland field >paddy field>vegetable field>orchard field. The available potassium was highest in 0-20 cm of orchard field, secondly was paddy field, then was upland field and the lowest was vegetable field. Soil urease activity in 0-20 cm performed: upland field>vegetable field>paddy field>orchard field. Soil catalase in 0-20 cm performed: paddy field>orchard field=vegetable field>upland field. Soil available nutrients reached significant level in each layer under different land use patterns mostly, but soil enzyme activities were not obvious (P<0.05).