PDF(Pubmed)
Abstract：
Continuous cultivation of tobacco could cause serious soil health problems, which could cause bacterial soil to change to fungal soil. In order to study the diversity and richness of fungal community in tobacco-growing soil under different crop rotation, three treatments were set up in this study: CK (tobacco continuous cropping); B (barley-tobacco rotation cropping) and R (oilseed rape-tobacco rotation cropping). The results of this study showed that rotation with other crops significantly decreased the soil fungal OTUs, and also decreased the community richness, evenness, diversity and coverage of fungal communities. Among them, B decreased the most. In the analysis of the composition and structure of the fungal community, it was found that the proportion of plant pathogens Nectriaceae decreased from 19.67% in CK to 5.63% in B, which greatly reduced the possibility of soil-borne diseases. In the analysis of the correlation between soil environmental factors and fungal communities, it was found that Filobasidiaceae had a strong correlation with TP and AP, and Erysiphaceae had a strong correlation with TK and AK. NO3--N and NH4+-N were the two environmental factors with the strongest correlation with fungal communities. The results of this study showed that rotation with other crops slowed down the process of soil fungi in tobacco-growing soil and changed the dominant species of soil fungi community. At the same time, crop rotation changed the diversity and richness of soil fungal community by changing the physical and chemical properties of soil.
摘要：
持续种植烟草会造成严重的土壤健康问题,这可能会导致细菌土壤变成真菌土壤。为研究不同轮作条件下植烟土壤真菌群落的多样性和丰富度,本研究设置了三种处理方法：CK（烟草连作）；B（大麦-烟草轮作）和R（油菜-烟草轮作）。这项研究的结果表明，与其他作物的轮作显着降低了土壤真菌OTUs，也降低了社区的丰富性，均匀度，真菌群落的多样性和覆盖率。其中,B下降最多。在对真菌群落组成和结构的分析中，结果发现，植物病原菌的比例从CK的19.67%下降到B的5.63%，这大大降低了土传疾病的可能性。在土壤环境因子与真菌群落的相关性分析中,结果发现，丝草科与TP和AP有很强的相关性，与TK和AK有很强的相关性。NO3--N和NH4+-N是与真菌群落相关性最强的两个环境因子。本研究结果表明，与其他作物轮作减缓了植烟土壤中土壤真菌的生长过程，改变了土壤真菌群落的优势种。同时,轮作通过改变土壤理化性质改变了土壤真菌群落的多样性和丰富度。
