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通过室内模拟培养试验,添加水稻秸秆及由此热解产生的生物质炭,分析亚热带典型旱地土和水稻土微生物生物量碳(MBC)、微生物生物量氮(MBN)及氮素矿化的变化动态,探讨添加不同处理方式的水稻秸秆对土壤碳氮矿化的影响。结果表明,培养35 d后,与对照(CK)相比,添加生物质炭处理,旱地土MBC、MBN、矿化氮量分别增加了34.6%、163.1%和6.4%;水稻土MBC没有明显差异,MBN和矿化氮量分别增加23.0%和15.1%。添加秸秆处理,旱地土MBC、MBN分别增加了90.4%和203.8%,矿化氮量却减少了22.2%;水稻土MBC、MBN、矿化氮量分别增加了13.4%、19.9%和7.3%。研究阐明了生物质炭添加对农田土微生物生物量氮和氮素矿化具有促进作用,而对土微生物生物量碳的影响却因土地利用方式的差异而略有不同;水稻秸秆添加对微生物生物量均有促进作用,其促进程度基本高于生物质炭,而对氮素矿化的影响因土地利用方式的不同而存在差异。
Microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and nitrogen mineralization in typical dryland and paddy soil in subtropical China were analyzed by in-situ simulated cultivation experiments, rice straw addition and biomass carbon produced by this pyrolysis The effects of rice straw with different treatments on soil carbon and nitrogen mineralization were discussed. The results showed that MBC, MBN and mineralized N increased by 34.6%, 163.1% and 6.4% respectively in the dry land, compared with the control (CK) after 35 days of culture. MBC in paddy soil showed no significant difference , MBN and mineralized N increased by 23.0% and 15.1% respectively. With the addition of straw, the MBC and MBN increased by 90.4% and 203.8%, while the mineralized N decreased by 22.2% and 13.4%, 19.9% and 7.3%, respectively. The research shows that the addition of biomass carbon can promote the microbial biomass nitrogen and mineralization of nitrogen in agricultural soil, while the effect on soil microbial biomass carbon is slightly different due to the difference of land use. The effect of rice straw addition on microbial biomass The promotion degree is basically higher than that of biomass carbon, but the influence on the mineralization of nitrogen is different due to different land use patterns.