Effects of rice-soybean-rice rotation on soil physicochemical properties and microbial community
Paddy rice(Oryza sativa L.)is mainly grown thrice a year in Hainan Island.However,long-term continuous cropping and excessive nutrient input will reduce soil microbial activity and soil nutrient conversion,which is not conducive to the sustainable development of agricultural production.The soil under rice-rice-rice(RRR)continuous cropping and rice-soybean-rice(RSR)rotation systems in Dong fang City,Hainan Island was determined by using conventional soil physical and chemical analysis and microbial analysis methods,and the soil physical and chemical properties,carbon components and microbial community structure under the rice continuous cropping and the rice-soybean-rice rotation were compared to analyze the effects of the RRR and RSR on the soil physical and chemical properties and microbial community structure.The results showed that soil organic matter,total nitrogen content,available phosphorus,available potassium and rice yield under the RSR treatment were all higher than those under the RRR treatment,indicating that the RSR treatment significantly increased soil total nitrogen and available potassium content and decreased soil pH value.The soil microbial analysis showed that ACE,Chaol and Shannon indices of the soil bacteria under the RSR treatment increased by 40.2％,40.3％and 5.7％,respectively as compared with those under the RRR treatment.The soil microbial analysis also showed that the Shannon and Simpson indices of the soil fungi under the RSR treatment increased by 20.1％and 16.5％,respectively as compared with those under the RRR treatment.The soil microbial analysis showed that the RSR rotation had a significant effect on soil microbial community composition.The soil bacterial and fungal community compositions were significantly correlated with soil organic matter,available potassium,pH,hot water extractable carbon(HWEC)and microbial biomass carbon(MBC)(P＞0.01).All the results showed that the RSR rotation significantly improved the soil microbial community structure,promoted the decomposition of organic matter,improved the availability of phosphorus and available potassium,and thus improved the crop yield.
万方数据
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