The Improvement Effect of Enteromorpha prolifera Biochar on Chromium-Contaminated Soil

Abstract

Using biochar to improve chromium-contaminated soil is a promising method. In this study, the Enteromorpha prolifera biochar was prepared at different temperatures (300 °C 700 °C), and rye pot experiment was conducted to examine the improvement effect of Enteromorpha prolifera biochar on the chromium-contaminated soils. The results showed that biochar could obviously promote the growth of rye in the chromium-contaminated soil. Compared with the control group, plant height, root length and biomass were increased, with the maximum increases of 38.9 %, 32.1 % and 34.7 %. The chlorophyll content was increased to 2.2 - 4.6 times, and the proline and peroxidase (POD) contents were significantly decreased, with maximum decreases of 72.8 % and 93.2 %. The Enteromorpha prolifera biochar prepared at 400 °C had a best effect on improvement of chromium-contaminated soil at the dose of 30 g·kg-1. The biochar effectively alleviated the stress from Cr (VI), and promoted the growth and metabolism of rye.