关键词: 土壤调理剂, 土壤养分, 土壤微生物, 功能多样性

Abstract: Taking the typical laterite in Hunan Provice and tobacco variety “K326” as experimental material, this paper explored the effects of soil conditioner on soil nutrient content and microbia functional diversity through a plot experiment. The results showed that soil conditioner could  change the soil nutrient, soil pH, and significantly increase the contents of organic matter, available phosphorus, and available potassium. While there was no significant difference in alkaline nitrogen content. It was found that the AWCD (average well color development) value was remarkably increased when adding the soil conditioner at a proper weight percent. However, the AWCD value could decline when too much soil conditioner was applied. The order of soil microbial AWCD values was T2＞T1＞T3＞CK. The activities of species richness and McIntosh index were increased significantly at the application rate of 0.2%, the enzyme activities were increased by 55.1%, 88.4% than that of the CK, respectively. The result of principal component analysis showed that the diversities and the carbon utilization ability of soil microbial community had a lot of discrepancies by using soil conditioner. All in all, proper addition of soil conditioner could increase soil nutrient content, and improve the soil microbial functional diversity. The most appropriate application rate was 0.2%.

Key words: soil conditioner, soil nutrient, soil microorganism, functional diversity