| 原文摘要 | Both laboratory and field studies have reported that biochar can increase and decrease plant growth and yield. However, the mechanisms behind this diverse biochar-mediated response have not been fully illuminated, particularly in term of the implications of biochar aging. This study performed both field and pot experiments to detect how biochars influence on soil properties and rice growth with time. Soil properties, rice growth and yield after 2 years biochar emplacement were evaluated and compared the data for 2 successive years under field scale. The early growth responses of rice to biochar amendment (fresh and aged) were also assessed by conducting pot experiments. The initial application of wood biochar decreased soil properties (available N and P) and crop yield. Nevertheless, some soil properties (pH, WHC, CEC, and P) were increased after 2 year emplacement, whereby yield could be sustained. The freshly applied biochar at the rate of 0.8% decreased the fresh biomass weight of rice harvested at 30 days after sowing. The decreased growth parameters of 10-day-old rice seedlings were observed after first harvest when following fresh biochar, but no differences was found after second harvest with aged biochar. Overall, the findings revealed that biochars used in this study decreased some soil properties, grain yield and rice growth parameters soon after application; however, these induce changes such as increased in growth parameters (shoot dry matter) in aged. |