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以中国科学院海伦农业生态实验站的18 a长期定位施肥试验为平台,研究了在不施肥(CK)、施化肥(NPK)和化肥配施有机肥(NPKOM)条件下,0～100 cm土体剖面碳、氮的分布特征,并在此基础上分析0～100 cm土体碳氮储量的变化。结果表明,与CK处理相比,施用有机肥的NPKOM处理增加了0～60 cm剖面土壤的碳、氮含量,而施化肥NPK处理,只增加了0～20 cm耕层土壤碳、氮含量。从0～100 cm土体碳、氮储量来看,施肥对0～100 cm土体碳、氮储量影响较小,尽管各处理间的变化趋势为NPKOM>NPK>CK,但处理间差异不显著。剖面土壤碳、氮含量存在着线性关系,相关系数R=0.991。与无肥CK处理相比,化肥配施有机肥NPKOM处理和化肥NPK处理的C/N有下降趋势,而与NPK处理相比,NPKOM处理的C/N也有所降低,这些结果表明长期定位施肥条件下的土壤剖面碳、氮的变化是相互影响,相互制约。
Based on the 18-year long-term fertilization experiment at Helen Agricultural Ecology Experimental Station, Chinese Academy of Sciences, the effects of fertilization (CK), chemical fertilizers (NPK) and chemical fertilizer combined with organic fertilizer (NPKOM) The distribution characteristics of carbon and nitrogen in the section, and on the basis of this, the change of carbon and nitrogen reserves in 0 ~ 100 cm soil was analyzed. The results showed that compared with the CK treatment, NPKOM treatment with organic manure increased soil carbon and nitrogen contents at 0-60 cm soil profile. However, applying NPK fertilizer only increased soil carbon and nitrogen contents at 0-20 cm soil topsoil. From the 0-100 cm soil carbon and nitrogen reserves, the effect of fertilization on the carbon and nitrogen reserves of 0-100 cm soil was less. Although the trend of NPKOM> NPK> CK was not significant among the treatments, the difference was not significant . There is a linear relationship between soil carbon and nitrogen content in the profile, the correlation coefficient R = 0.991. Compared with no CK treatment, the C / N of NPKOM and NPK decreased with the application of chemical fertilizers and NPK treatments, while the C / N of NPKOM decreased as compared with NPK treatment. These results indicated that long-term fertilization Under the conditions of soil profile carbon and nitrogen changes are mutual influence, mutual restraint.