Dephenolization pyrolysis fluid improved physicochemical properties and microbial community structure of saline-alkali soils

Abstract Because of its acidity, biomass pyrolytic fluid (BPF) had been paid attention in the amelioration of saline soil. However, BPF contained biotoxic phenolic compounds and must be refined before use. Most of the existing refining methods were cumbersome and uneconomical. A simple one-step salting-out extraction system of was developed. BPF was successfully divided into upper and lower phases, and most phenolic substances were concentrated in the upper phase. The lower phase diluted 400 times at the pyrolysis temperature of 500℃ was added into saline-alkali soil, which greatly increased the content of soil available nutrients. Under the action of organic acids, soil pH and total salt content could be reduced effectively, and soil enzyme activities can be increased. Microbial community analysis showed that the addition of LP could increase the proportion of Actinomycetes, which played a beneficial role in improving soil fertility, and then improved the growth of Chinese cabbage.