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为了了解长期施肥,尤其是氮肥对紫色土麦季土壤活性碳的影响,并揭示部分土壤理化性质和土壤活性碳之间的关系,笔者以重庆北碚国家紫色土肥力监测基地的8个不同施肥处理为基础,于麦季(2008年11月—2009年5月)研究了不同施肥对土壤可溶性有机碳及微生物量碳的影响。结果表明:紫色土水旱轮作田麦季各处理间土壤的可溶性有机碳差异不显著。PKR-处理的微生物量碳含量显著低于其他处理。而N肥的施用有利于土壤中微生物量碳的升高,但方差分析显示作用并不明显。对比相同秸秆还田方式下各处理间MBC的差异发现:R+>FnR+≥FhR+;NR->R->FnR-,但差异不显著。不同秸秆还田情况下R-比R+微生物量碳减少了44.4%,且差异显著,FnR+与FnR-相比后者也减少30.9%。相关分析显示,土壤温度、土壤充水空隙度和pH均与土壤DOC存在显著的相关性,且土壤温度是负相关,WFPS、pH是正相关。
In order to understand the effect of long-term fertilization, especially nitrogen fertilizer on soil active carbon in purple soil and wheat season, and reveal the relationship between soil physical and chemical properties and soil active carbon, the author took 8 different fertilization treatments of Beidou National purple soil fertility monitoring base (November 2008 - May 2009) studied the effects of different fertilization on soil dissolved organic carbon and microbial biomass carbon. The results showed that there was no significant difference in soil soluble organic carbon in purple soil and waterlogged rotation and rotation wheat field. The microbial biomass carbon content of PKR-treated plants was significantly lower than that of other treatments. However, the application of N fertilizers was beneficial to the increase of microbial biomass carbon in soil, but the analysis of variance showed that the effect was not obvious. Compared with the same straw returning to different treatments, MBC differences were found: R +> FnR + ≥FhR +; NR-> R-> FnR-, but the difference was not significant. R-specific R + microbial biomass carbon decreased by 44.4% under different straw returning conditions, and the difference was significant. FnR + also decreased by 30.9% compared with FnR-. Correlation analysis showed that soil temperature, soil water-filled porosity and pH were significantly correlated with soil DOC, and soil temperature was negatively correlated with WFPS and pH.