Chinese Journal OF Rice Science >
Effects of Straw Returning Techniques on Soil Nutrients, Organic Carbon and Microbial Diversity in Tobacco-rice Rotation System
Received date: 2022-09-01
Revised date: 2022-10-09
Online published: 2023-07-17
【Objective】 It is of great significance to elucidate the effects of different rice-straw returning techniques on soil properties and the underlying mechanisms of rhizosphere microbial remediation and soil improvement, and to find an efficient straw returning technology suitable for the tobacco-rice rotation area in Fujian, so as to lay a basis for high-quality and efficient crop cultivation.【Method】 Using flue-cured tobacco Yunyan 87 and late rice Yongyou 1540 as materials, a 2-year field experiment was carried out to reveal changes in soil nutrient properties and microbial communities in tobacco-rice rotation system and their relationships under various straw returning modes.【Results】 With rice straw returning for two consecutive years, grain yield of each treatment was significantly increased, among which, T2 treatment with lime and urea was the best. The yield of tobacco and rice under T2 treatment increased by 25.67% and 11.49% respectively compared with T0, followed by T3 treatment with Fuganlin and urea, and T1 treatment with straw returning. In the first year, the yield of tobacco in T1 treatment was not significantly different from that of the control, but in the second year, the yields of tobacco and rice were 3.77% and 5.90% higher than those of the control, respectively. After two consecutive years of straw returning, the nutrient and organic carbon contents of topsoil in each treatment were significantly increased, T2 treatment ranked first, followed by T3 treatment. The contents of alkali-hydrolyzed nitrogen, available phosphorus, available potassium, soil organic carbon and dissolved organic carbon in T2 treatment increased by 7.09%, 5.97%, 3.01%, 11.32% and 5.47%, respectively compared with the control. The rhizosphere microbial community analysis showed that the relative abundance of HSB_OF53-F07 related to carbon source metabolism, Arthrobacter related to the degradation of toxic substances and Pseudeurotium related to cellulolysis increased significantly in T2 and T3 treatments compared with the control, while the abundance of Humicola and Penicillium associated with pathogenesis decreased significantly. Further correlation analysis found that the increase of beneficial bacteria in the rhizosphere were positively correlated with soil nutrients, while the abundance of pathogenic bacteria were negatively correlated with soil nutrients.【Conclusion】 Rice-straw returning with lime or Fuganlin and appropriate amount of urea is conducive to increasing the nutrient contents in the topsoil, promoting the growth of beneficial microorganisms such as nitrogen-fixing bacteria, inhibiting pathogenic bacteria, and creating a good soil environment for tobacco-rice rotation, and thus improving crop yield.
HUANG Jinwen, LI Rikun, CHEN Zhicheng, ZHANG Bianhong, LEI Han, PAN Ruixin, YANG Mingyu, PAN Meiqing, TANG Lina . Effects of Straw Returning Techniques on Soil Nutrients, Organic Carbon and Microbial Diversity in Tobacco-rice Rotation System[J]. Chinese Journal OF Rice Science, 2023 , 37(4) : 415 -426 . DOI: 10.16819/j.1001-7216.2023.220901
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