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Salinty and alkali are the serious stress in arid and semiarid area, which has a bad effect on plant growth. It is necessary for us to explore the variety of microbial community and the activity of enzyme in rhizosphere of Pennisetum giganteum(giant juncao)under saline-alkali environment. As a result, we set up the experiment with seven different kinds of saline-alkali concentrations, analyze the difference significance and correlation of physiological data under different saline-alkali concentrations with the method of SPSS, and analyzed the diversities of microbial communities with the method of Illumina high-throughput sequencing. The results were as follows:(1)The composition of microbial communities in rhizosphere soil of giant juncao differed at different saline-alkali stresses; The dominant groups were Sordariomycetes(68.5%), Eurotiomycetes(16.3%), Chloroflexia(8.5%), Bacteroidia(13.5%), Gemmatimonadetes(5.6%)and δ-Proteobacteria(3.7%)at the 12‰ saline-alkali concentration; The relative abundance of the Dothideomycetes(27.7%)and Anaerolineae(2.4%)was sharply reduced to 2.5% and 0.007% when the saline-alkali concentration increased from 6‰ to 12‰; The Chao and Shannon indexes of the rhizosphere microbial community of giant juncao decreased with increasing saline-alkali concentration, and were significantly correlated with soil saline-alkali concentration(P<0.01).(2)The low concentration of saline-alkali stress had a positive effect on activities of urease, polyphenol oxidase and alkaline phosphatase in rhizophere soil of giant juncao, but activities of polyphenol oxidase, alkaline phosphatase and sucrase were inhibited when the saline-alkali concentration of soil exceeded 8‰; After planting giant juncao, the content of soil organic matter increased significantly(P<0.05)and the saline-alkali concentration were reduced significantly(P<0.05); The neutralizing ability to soil alkalinity gradually weakened with the increasing saline-alkali concentration, and the neutralizing ability of soil salinity gradually weakened when the concentration exceeded to 8‰; When the saline-alkali concentration was 6‰, the production of giant juncao was the highest and the soil had higher contents of available nutrients and organic matter. The research indicates that growing giant juncao is beneficial to improving the fertility of saline-alkali soil by adjusting the enzyme concentration to better adapt to the medium and low concentration saline-alkali soil environment, and producing the corresponding dominant flora to adapt to the environment in different degrees of saline-alkali soil. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To reveal the correlation between plant communities and soil chemical factors (pH, the total amount of soil soluble salt, TN, TP, SOM, K + , Na + , Ca 2+ , Mg 2+ , Cl - , SO 4 2- , HCO 3 - ) in Shandong coastal saline area, a field investigation of 81 samples was carried out and the chemical properties of the soil were analyzed. The results showed that a total of 85 species, 67 genera and 30 families of salt-tolerant plants were recorded. The top three dominant families were Compositae, Gramineae and Chenopodiaceae. The community could be divided into four types: Phragmites aus-tralis - Imperata cylindrical + Artemisia capillaris, Suaeda salsa + P. australis - A. capillaris + Kochia scoparia, P. australis - Typha orientalis + Apocynum venetum, P. australis - A. venetum. The CCA sequencing results showed that the soil total soluble salt and water-soluble ions were the key chemical factors affecting the distribution of salt-tolerant vegetation, followed by total nitrogen content. The community of P. australis - I. cylindrical + A. capillaris had richest species diversity among the four community types, and the resources of salt-tolerant plants were abundant. The species diversity of plant community showed a significant negative correlation with soil total soluble salts and water soluble salt ions content. The plant community diversity index would be reduced by the high saline soil.