INFLUENCE OF DIFFERENT PHYTOREMEDIATION ON SOIL MICROBIAL DIVERSITY AND COMMUNITY COMPOSITION IN SALINE-ALKALINE LAND

Soil salinization is one of the main environmental factors that restrict plant growth and agricultural productivity. However, phytoremediation is one of the important means to improve saline alkali soil by planting halophytes or salt tolerant plants. In this study, the effects of four plants on soil microbial diversity and community composition were investigated by high-throughput sequencing. The results showed that plants significantly decreased pH, TS and BD, while increased OM, TN, AN, TP, AP, TK and TPOR in saline alkali soil, and the number of nitrote bacteria was reduced by plants. Except for YM treatment, other treatments significantly increased the number of nitrifying bacteria and denitrifying bacteria, while only YK treatment increased the number of fungi. In addition, all plants increased the activity of nitrite reductase and decreased the activity of urease. Plant treatments shifted both the 16S rRNA gene bacterial and ITS gene fungal community compositions and only YM treatment significantly increased the bacterial diversity, but decreased the fungal diversity, while other treatments were the opposite. The total bacterial and fungal community structures were strongly affected by plants, and bacterial community composition was closely related to the soil TPOR and that of fungi was significantly related with OM and urease. These data demonstrate that planting significantly affected soil N and P as well as the total bacterial and fungal community compositions. Planting suitable plants can effectively restore the quality of saline alkali soil, and provide certain theoretical basis for the further development of agriculture.