Microbial Interactions and Roles in Soil Fertility in Seasonal Freeze-Thaw Periods under Different Straw Returning Strategies

Mengqi Sun, Baoyu Chen, Hongjun Wang, Nan Wang, Taigang Ma, Yingshun Cui, Tianhao Luan, Seongjun Chun, Chunguang Liu and Lichun Wang
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Mengqi Sun: Institute of Agricultural Resources and Enviroment Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China
Baoyu Chen: Institute of Agricultural Resources and Enviroment Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China
Hongjun Wang: Institute of Agricultural Resources and Enviroment Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China
Nan Wang: Institute of Agricultural Resources and Enviroment Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China
Taigang Ma: Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, Jilin Provincial Key Laboratory of Water Resource and Enviroment, College of New Energy and Environment, Jilin University, 2519 Jiefang Road, Changchun 130021, China
Yingshun Cui: Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Korea
Tianhao Luan: Institute of Agricultural Resources and Enviroment Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China
Seongjun Chun: LMO Research Team, National Institute of Ecology, Seocheon 33657, Korea
Chunguang Liu: Institute of Agricultural Resources and Enviroment Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China
Lichun Wang: Institute of Agricultural Resources and Enviroment Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China

Agriculture, 2021, vol. 11, issue 8, 1-15

Abstract: With the increase of world food demand, the intensity of cultivated land use also increased. To improve soil nutrient concentrations and crop yield, several straw returning techniques have been developed. Studies have shown that straw returning is beneficial to soil, but few studies have focused on the relationship between microbes and fertility in seasonal freeze-thaw periods. A two-year cropland experiment was set up that comprised three different straw return strategies, namely covering tillage with straw return for two years (CS), rotary tillage and straw return for two years (RS), rotary covering tillage with straw return (first year covering and the second year rotary tillage) (CRS), and conventional tillage with no straw return (CK). Illumina Miseq high throughput sequencing of 16S rRNA was applied to assess bacteria community structure. The relationship between bacteria community structure and changes in soil fertility induced by different straw incorporating during seasonal trends was studied. Our results showed that soil bacterial communities varied significantly during the soil seasonal freeze-thaw period in the northwest of Jilin province, China, and were influenced, to some extent, by the different straw returning procedures. Multidimensional analysis revealed that total phosphorus (TP), available nitrogen (AN), and total nitrogen (TN) were the major drivers of bacterial community structure. The co-occurrence network was divided into several modules. Notably, the major bacterial modules varied significantly in different sampling periods and different treatments. These results suggested that specific bacterial groups could contribute to soil fertility in relation to environmental fluctuations. Some bacterial groups (e.g., Pyrinomonadales , Rhizobiales , Sphingomonadales , and Xanthomonadales , in order level) were directly linked with specific environmental factors, indicating the key roles of these groups in soil fertility. In summary, the soil bacterial communities varied significantly during the freeze-thaw period and might play important roles in the degradation of straw. Thus, the straw return could enhance soil fertility.

Keywords: seasonal freeze-thaw periods; 16S rRNA; straw returning; soil fertility; bacterial community; microbial association network (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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