关键词: 热带, 农业废弃物, 生物质炭, 土壤, pH, 交换性能

Abstract: In order to improve acid soil by rationally using tropical agriculture wastes, this experiment  added 15 g/kg and 45 g/kg biochars of coconut shell (CSC), cane trash(CTC), rubber wood(RWC), banana stem(BPC) to soil in rubber plantation to study their effects on soil acidity and exchange performance. The results indicated that 4 biochars under 2 additive amounts could remarkably increase soil pH  compared to the control, excluding the treatments of adding 15 g/kg CTC for 9 d, 30~60 d and 45 g/kg CTC for 45 d. The order of pH increasing effect BPC>RWC>CSC>CTC. There were remarkable difference in soil pH increasing effects among different biochar treatments. The contents of exchangeable acidity and aluminium were significantly decreased in all treatments, except adding 15 g/kg CTC treatment, while soil exchangeable hydrogen was significantly lower than that of the control only when adding 45 g/kg CTC and 15 g/kg, 45 g/kg BPC. Besides, BPC, CSC and CTC significantly increased soil CEC and BSP, but RWC only improved soil BSP. The above results indicated that biochars of BPC, RWC, CSC and CTC produced by tropical agriculture wastes, could increase the soil pH in rubber plantation, decrease the contents of exchangeable acidity and aluminium, so as to improve soil acidity condition of rubber plantation. The above  biochars could also increase soil CEC and BSP. Therefore, BPC, RWC, CSC and CTC produced by tropical agriculture wastes could be used to improve acid soil of tropical rubber plantation, but there were differences in soil improvement effects by different kinds of biochar and with different dosages.

Key words: tropic, agriculture waste, biochar, soil, pH, exchange capability