秸秆及生物质炭对砖红壤酸度及交换性能的影响

为合理运用秸秆材料改良热带地区砖红壤,采用室内培养试验研究了玉米秸秆及其制备的生物质炭对海南花岗岩母质发育的砖红壤的酸度和交换性能的影响。试验设单施生物质炭(B)、生物质炭和秸秆混合施用(BCS)、单施秸秆(CS)及对照(CK)共4个处理。结果表明,添加生物质炭和秸秆显著提高土壤p H、CEC、交换性盐基总量和盐基饱和度。秸秆和生物质炭可降低土壤交换性酸,尤其是交换性酸中交换性铝含量更是显著降低,表明生物碳和秸秆施用能够有效降低砖红壤酸度,提高交换性能。不同处理改良效果的大小顺序为CSBCSB。

Effect of Corn Straw and Biochar on Acidify and Exchangeable Capacity in Tropical Latosol Soil

An incubation experiment was conducted to investigate the effect of application of corn straw and biochar on acidify and exchangeable capacity in tropical latosol originated from granite, which can support the theoretical basis for improving quality of latosol in tropical region. Biochar (B), corn straw (CS) and biochar corn straw (BCS) were applied into soil, respectively, and no organic material was also arranged as control (CK). Amending B, S and BS could significantly increase pH, CEC, ion exchange capacity, and base saturation percentage, but highly debased soil exchangeable acid, especially for exchangeable aluminum of exchangeable acid, which suggest that B and S can effectively reduce soil acidify, increase exchangeable capacity in tropical region. The improvement effect of organic materials on different treatment atosol was in order as CS, BCS and B.