Abstract:

【Objective】 This paper was aimed to discuss the effects of intercropping aromatic plants on the microbial quantity and nutrients in sand soil in pear orchard. 【Method】 Intercropping Centaurea cyanus, Saturela hortensis L, Nepeta cataria, Agerarum houstonianum and Ocimum basilicum L were used as experimental treatments and natural grass was used as control to study the soil microbial quantity , the content of the soil nutrients,as well as the relationship among them during their young fruit period,fruit enlargement period, and fruit maturity period, respectively. 【Result】 Compared with the control, intercropping Centaurea cyanus and Ocimum basilicum L increased the microbial quantity significantly in different developing periods and at each soil layer , as well as regulated the ratio of the soil fungi, bacteria and actinomyees in soil microbial community. Intercropping aromatic plants also showed different effects on microbial quantity and ratio. The soil microbial quantity under different treatments was more than that in young fruit period, and the ratio among the fungi, bacteria and actinomyees in fruit enlargement and maturity periods was more favorable than the latter in different layers. The microbial quantity was much higher at layer of 0-20 cm than that of 20-40 cm under different treatments. Compared with the control, all treatments showed different effects on soil nutrient. The content of the soil nutrients under different treatments showed various trends with the change of developing period. The correlation analysis showed that there were multiple significant positive correlations between microbial quantity and the content of soil nutrients with aromatic plants intercropping in sand soil in pear orchard. 【Conclusion】 From analysis it could be seen that intercropping aromatic plants in sand soil in pear orchard had good regulatory effects on the soil microbial quantity , the ratio of the soil fungi, bacteria and actinomyees in soil microbial community and the soil available nutrients, among which, intercropping Ocimum basilicum L on the soil microbial quantity and content of the soil nutrients was better than other treatments.

Key words: pear trees, intercropping, aromatic plants, soil microbial quantity, soil nutrients