Differences in Distribution of Potassium-Solubilizing Bacteria in Forest and Plantation Soils in Myanmar

Xin Dong, Le Lv, Weijun Wang, Yongzhi Liu, Chunhua Yin, Qianqian Xu, Hai Yan, Jinxia Fu and Xiaolu Liu
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Xin Dong: School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Le Lv: School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Weijun Wang: School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Yongzhi Liu: School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Chunhua Yin: School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Qianqian Xu: School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Hai Yan: School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jinxia Fu: Hawaii Natural Energy Institute, University of Hawaii, Honolulu, HI 96822, USA
Xiaolu Liu: School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China

IJERPH, 2019, vol. 16, issue 5, 1-14

Abstract: Potassium (K) has been recognized as an essential element in intensive agricultural production systems, and deficiency of K usually results in a decrease in crop yields. The utilization of potassium-solubilizing bacteria (KSB) to increase the soluble K content in soil has been regarded as a desirable pathway to increase plant yields. Following the inoculation of KSB in the soil, potassium can be released (in the form of K + ) and consumed by plants. This study aims to investigate and compare the distribution characteristics of potassium-solubilizing bacteria between forest and plantation soils in Myanmar. In this study, 14 KSB strains were isolated from rhizosphere samples collected from forest soil, as well as fertilized rubber tree rhizosphere soil and fertilized bare soil from a plantation. Broadleaf forests with high levels of canopy cover mainly comprised the forest environment, and rubber trees were planted in the plantation environment. The Chao and abundance-based coverage estimator (ACE) indices showed that the microbial abundance of the plantation soil was higher than that of the forest soil. According to the Illumina MiSeq sequencing analysis results, the Shannon index of the forest soil was lower while the Simpson index was higher, which demonstrated that the microbial diversity of the forest soil was higher than that of the plantation soil. Potassium-solubilizing test results showed that the strains E, I, M, and N were the most effective KSB under liquid cultivation conditions. Additionally, KSB only accounted for less than 5.47% of the total bacteria detected in either of the sample types, and the distribution of dominant KSB varied with the soil samples. As another result, the abundance of Pseudomonas spp. in S1 was higher than in S2 and S3, indicating a negative impact on the growth of Pseudomonas in the fertilized rubber tree rhizosphere soil. The significance of our research is that it proves that the increasing use of KSB for restoring soil is a good way to reduce the use of chemical fertilizers, which could further provide a relatively stable environment for plant growth.

Keywords: Rubber tree; bacterial community; rhizosphere; potassium solubilizing bacteria; microbial ecology (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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