The effects of birch (Betula spp.) biochar and pyrolysis temperature on soil properties and plant growth

摘要

The addition of biochar to agricultural soils is recommended to improve soil functions and plant growth. However, due to high variability in the quality of biochar, its effects on soils and plants are likely to differ. We explored the impacts of pyrolysis temperature on the quality and usability of birch wood biochar as a soil amendment. The impact of three biochar types - pyrolysed at 300, 375 or 475 degrees C - on soil characteristics and the growth of lettuce (Lactuca sativa), radish (Raphanus sativus), barley (Hordeum vulgare) and ryegrass (Lolium perenne) was investigated in a greenhouse experiment. In addition, the potential adverse effects of biochar on soil organisms (nematodes, earthworms, microbial biomass and activity) were studied.