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依托辽宁阜新褐土田间施肥定位试验,针对不施肥对照(CK)、单施化肥(NPK)、单施有机肥(M)和有机肥-化肥配施(NPKM)4种不同施肥处理,分析0~20 cm耕层土壤总有机碳(TOC)及关键活性碳组分,旨在为区域土壤合理培肥和农业可持续管理提供科学依据。结果表明:在4种施肥处理中,NPKM处理的土壤总有机碳含量及其储量、微生物生物量碳(MBC)、可溶性有机碳(DOC)、颗粒有机碳(POC)和易氧化有机碳(LOC)含量均比其他3种处理高,较对照分别提高40.5%、38.6%、114.7%、57.5%、103.8%和97.6%,且含有机肥的处理土壤微生物生物量碳明显高于不含有机肥的处理。相关性分析表明,TOC、MBC、DOC、POC以及LOC间呈正显著相关性(P<0.05),各组分碳间关系密切。在本试验条件下,长期进行有机肥与化肥配施,对于提升土壤有机碳水平的效果最为显著,是提高土壤肥力最优施肥模式。土壤活性碳组分对施肥措施响应敏感,可以作为土壤总碳水平变化的预警指标。
Based on the fertilization and locating experiments of Fuxin clay in Liaoning Province, four different fertilization treatments, CK (no fertilizer), NPK (single application), M (organic fertilizer) and NPKM The soil total organic carbon (TOC) and key activated carbon fraction of 20 cm soil layer in order to provide a scientific basis for rational soil fertility management and sustainable agricultural management. The results showed that total organic carbon (SOC), total organic carbon (MBC), dissolved organic carbon (DOC), particulate organic carbon (POC) and oxidizable organic carbon ) Were higher than those of the other three treatments, increasing by 40.5%, 38.6%, 114.7%, 57.5%, 103.8% and 97.6% respectively compared with the control, and the microbial biomass carbon of treated organic manure was significantly higher than that of non-manure Processing. Correlation analysis showed that TOC, MBC, DOC, POC and LOC were positively correlated (P <0.05), and the carbon content of each component was closely related. Under the experimental conditions, long-term application of organic manure and chemical fertilizers has the most significant effect on increasing the level of soil organic carbon and is the optimal fertilization mode for improving soil fertility. The soil active carbon component is sensitive to the fertilization measures and can be used as an early warning indicator of soil total carbon level.