Effects of Tobacco Planting Systems on Rates of Soil N Transformation and Soil Microbial Community

文献类型： 外文期刊

第一作者： Zhang, Jiguang

作者： Zhang, Jiguang;Zhang, Yizhi;Zheng, Linlin;Shi, Yi;Kong, Fanyu;Ma, Xinghua;Zhang, Zhongfeng;Tian, Lei

作者机构：

关键词： Ammonification;Nitrification;Phospholipid fatty acids (PLFAs);Soil microbial community;Flue-cured tobacco

期刊名称：INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY （ 影响因子：0.822； 五年影响因子：0.906 ）

ISSN： 1560-8530

年卷期： 2017 年 19 卷 5 期

页码：

收录情况： SCI

摘要： Crop rotation is an efficient practice to control soil-borne pathogens and pests of continuous tobacco planting. For a wider and more detailed evaluation, the effects of four tobacco planting systems (T1, continuous cropping; T2, green manure-tobacco with crop rotation; T3, wheat inter-cropping; and T4 wheat-tobacco with crop-rotation) on soil N transformation and soil microbial community structure were evaluated using indoor culture and phospholipid fatty acids (PLFAs) technique in a four year field experiment. The results indicated that soil NH4+ and NO3- contents were both significantly affected by tobacco growth stages and planting systems, and were dependent upon form of N supplied. Rates of ammonification and nitrification and PLFA data from different soil microbial floras all varied with the tobacco planting systems and growth stages. Rates of ammonification increased at first, then decreased and increased in all treatments at the maturity stage. Rates of nitrification decreased at first and reached their lowest values at the fast-growing stage. The soil microbial community structure changed significantly in T4 throughout the whole tobacco growing season compared to that of T1. Correlation analysis indicated that the NH4+ content and ammonification rate were not or negatively and significantly correlated with the most parts of PLFAs except for ammonification rate with PLFAs of fungi and anaerobic bacteria, which was different from the NO3- content and nitrification rate. It was deduced that soil N transformation processes associated with soil microbial communities changed by differing tobacco planting systems, and the wheat-tobacco with crop rotation might be the optimized rotation system in the local area. (C) 2017 Friends Science Publishers

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