Influence On Soil Microorganism And Soil Enzyme Activity And Soil Nutrient Of Intercropping Aromatic Plants In Pear Orchard

This paper was aimed to discuss the effects of intercropping aromatic plants on the soil microorganism and soil enzyme activities and soil nutrients in pear orchard. Intercropping Ocimum basilicum L.(Tr1), Nepeta cataria(Tr2), Saturela hortensis L.(Tr3), Agerarum houstonianum(Tr4) and were selected as experimental treatments, natural grass(Tr5) and clean tillage(Tr6)were selected as control, determined the quantities of the soil bacteria, fungi, actinomycete, and several physiological groups of microorganisms and soil nutrient content and the activities of urease, protease, phosphatase, catalase, converting enzyme. That was to reflect of the influence of intercropping aromatic plants on the soil microorganism quantity, soil enzyme activity and soil nutrient in pear orchard. Results were as follows:1 Compared to natural grass and clean tillage plots, the soil microorganism quantity of intercropping aromatic plants plots in the period of pear vigorous growing season (May to September), and ameliorate the soil microbial community structure. The change of bacteria and fungi quantities in the same seasonal trends, and the lowest in April, then gradually increased to the maximum in August, September and October of bacteria and fungi decreased slightly. The number of actinomycete was the maximum in June, and the lowest in April and August. The seasonal change trends of nitrobacteria, denitrobacter and Nitrogen-fixing bacteria were similar. There were different levels of increasing the quantity of microorganisms in the intercropping aromatic plants plots.2 It was significant that the soil enzyme activities of the pear growing period were improved in aromatic plants intercropping areas. The study results showed that urease activity was gradually increased, and then decline. Only in September and October the diversities of the five treatments were not significant. Soil invertase activity from April to June was at a low level, and at high level from July to August. Only in September, the aromatic intercropping and soil tillage invertase activity were no significant difference in the control area, and in other phases the diversities of soil enzymes activity of aromatic plants intercropping areas were significant.3 Intercropping aromatic plants can significantly increase the water content of soil of pear orchards, especially in the July and August. The impact on soil pH value is not significant. The level of soil organic matter was dissimilarly increased in aromatic plants intercropping areas, especially Agerarum houstonianum area. Compared to natural grass area and clean tillage area, the macronutrients and trace elements were significantly improved in intercropping Ocimum basilicum L. and Saturela hortensis L. areas of pear orchard, whereas the extent of changes was different in different phases. In intercropping Ocimum basilicum L. area the contents of soil nitrogen, total phosphorus and available phosphorus were significantly increased. The contents of calcium, magnesium and zinc were not obvious diversification in the different treatments, but iron and copper content have a significant effect, especially in intercropping Nepeta cataria area with the highest content of iron and copper.4 By the analysis of composite index by the membership function and soil quality index, we consider that the soil fertility could be improved by intercropping aromatic plants, especially Saturela hortensis L..