Soil phosphorus forms and phosphorus solubilizing bacteria distribution after restoration from seriously burning in Greater Khingan Mountain areas, China

doi:10.13287/j.1001-9332.202002.033

Abstract

Abstract: To understand the contents of various phosphorus forms, phosphorus solubilizing bacte-rial community structure and the relationship between them in soils after restoration from the seriously burning, we collected soil samples from artificial restoration (Pinus sylvestris var. mongolica plantation, Larix gmelinii plantation), artificial accelerated natural restoration (secondary forest) and natural restoration (natural secondary forest) stands in Greater Khingan Mountain area. Using methods of Sui et al. modified from Hedley phosphorus fractionation, we measured the contents of different phosphorus forms in rhizosphere soil and bulk soil (0-10, 10-20 cm). Abundances of phosphorus solubilizing bacteria were quantified by high-throughput sequencing method. The results showed that the contents of H₂O-P_i, NaHCO₃-P_i and NaHCO₃-P_oin 0-10 cm bulk soil and NaHCO₃-P_o in rhizosphere soil followed the order of L. gmelinii plantation > P. sylvestris var. mongolica plantation > natural secondary forest > secondary forest. The contents of H₂O-P_i, NaHCO₃-P_i, NaHCO₃-P_o in 10-20 cm bulk soil and H₂O-P_i, NaHCO₃-P_i in rhizosphere soil followed the order of L. gmelinii plantation > P. sylvestris var. mongolica plantation > secondary forest > natural secondary forest. The ratios of contents of H₂O-P_i, NaHCO₃-P_i and NaHCO₃-P_o in rhizosphere to those in bulk soil (R/S) were higher than 1 in all forest stands. The moderately labile NaOH-P included NaOH-P_i and NaOH-P_o. The content of NaOH-P was in order of L. gmelinii plantation > natural secondary forest > secondary forest > P. sylvestris var. mongolica plantation in 0-10 cm layer of bulk and rhizosphere soil, and ranked as L. gmelinii plantation > P. sylvestris var. mongolica plantation > secondary forest > natural secondary forest in 10-20 cm layer of bulk soil. There was rhizosphere effect of NaOH-P in the soil. The stable HCl-P included HCl-P_i and HCl-P_o. The content of HCl-P followed the order of L. gmelinii plantation > natural secondary forest > P. sylvestris var. mongolica plantation > secondary forest in 0-10 cm layer of bulk soil,and ranked as L. gmelinii plantation > P. sylvestris var. mongolica plantation > natural secondary forest > secondary forest in the 10-20 cm layer. The content of residual-P in the soil was not sensitive to restoration methods. Bradyrhizobium, Streptomyces, Burkholderia and Bacillus were the main phosphorus solubilizing bacteria across all forest stands. The abundances of phosphorus solubilizing bacteria in soil of L. gmelinii plantation and P. sylvestris var. mongolica plantation were significantly higher than that of secondary forest and natural secondary forest. Results of redundancy analysis showed that the correlation between phosphorus solubilizing bacteria and various phosphorus forms was different. Our results showed that artificial afforestation was more conducive in improving the availability of phosphorus in soil and the abundance of phosphorus solubilizing bacteria.

CHUN Xue, ZHAO Yu-sen, XIN Yin, LI Jin-xiang, LIANG Dong-zhe. Soil phosphorus forms and phosphorus solubilizing bacteria distribution after restoration from seriously burning in Greater Khingan Mountain areas, China[J]. Chinese Journal of Applied Ecology, 2020, 31(2): 388-398.

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