关键词: 长期定位试验, 石灰性土壤, 无机磷分级, 有机磷分级

Abstract: This paper studied the effects of different years continuous cropping and grafting on the microbial amounts and enzyme activities of eggplant soil. With the increasing year of continuous cropping, the amounts of bacteria and actinomyces as well as the activities of catalase, peroxidase, polyphenol oxidase,  and protease in own-ooted eggplant rhizosphere soil decreased, while that of fungi increased. There were significant positive correlations between soil microbial amounts and soil enzyme activities. The main factors affecting the amounts of soil bacteria and actinomyces were the activities of soil catalase, peroxidase, polyphenol oxidase, and protease, and the main factor affecting the amount of soil fungi was the activity of soil protease. Grafting increased the enzyme activities of eggplant soil, and relieved the stress of continuous cropping.

Key words: Long-term located experiment, Calcareous soil, Fractionation of soil inorganic phosphorus, Fractionation of organic phosphorus