Abstract
Phosphorus is one of the most important limiting nutrients for the ecological restoration of spoil material (SM). Phosphate-solubilizing bacteria (PSB) can improve the bioavailability of phosphorus in SM. Sticky glutinous rice paste (SGRP) is an eco-friendly water-retaining polymer commonly used for the ecological restoration of arid regions. However, the effect of SGRP and PSB on the phosphorus biotransformation and ecological restoration of SM is unknown. In this study, a PSB named Stenotrophomonas ML4 was isolated from SM and the role of SGRP and ML4 in promoting the ecological restoration of SM under drought conditions was investigated. Soil microcosm experiment showed that adding SGRP increased the soil moisture content and agglomeration, promoted ML4 colonization and secretion of extracellular polymers (EPS). The co-application of 25 % SGRP and 10 % ML4 increased the available phosphorus, and the activities of alkaline phosphatase, sucrase, and urease. In addition, the bacterial diversity and the abundance of genes involved in carbohydrate metabolism, amino acid metabolism, and signal transduction were also enhanced by SGRP and ML4. The pot experiment further verified that the combination of SGRP and ML4 promoted superoxide dismutase, peroxidase, and catalase activities of vetiver by 180.92 %, 69.04 %, 83.76 %, respectively, and increased the fresh weight of vetiver by 191.86 %. Our results showed that SGRP and ML4 could promote the dissolution of phosphorus and plant growth, which may be an effective way for in-situ ecological restoration of SM.
Published Version
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