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利用棕壤肥料长期定位试验,研究了不同施肥条件下棕壤有机碳在0~60 cm土层的含量和储量特征以及土壤固碳速率.试验共设6个处理,即氮磷肥有机肥配施(M_2NP)、氮肥有机肥配施(M_2N)、单施有机肥(M_2)、单施氮肥(N)、氮磷肥配施(NP)和不施肥处理(CK).结果表明:经过31年长期不同施肥,各处理土壤有机碳(SOC)含量和储量的剖面分布均呈现随土层深度增加而显著降低的规律.本试验条件下M_2NP、M_2N、M_2、NP、N、CK处理的耕层有机碳富集系数分别为0.465、0.455、0.407、0.48_2、0.393、0.471,表明耕层土壤对有机碳的保持强度最强.在0~60 cm土层土壤有机碳储量表现为M_2NP、M_2N>M_2、NP>N>CK,有机肥和化肥配施能够显著提高土壤有机碳含量和储量.与试验前相比,CK处理各土层土壤有机碳含量和储量均显著降低.各处理碳库管理指数(CPMI)表现为M_2NP>M_2N>M_2>N>NP>CK.分析不同施肥处理土壤固碳速率可知,与试验前相比,CK处理表现为碳的净释放,固碳速率达-401.4 kg·hm~(-_2)·a~(-1);固碳速率最高的为M_2NP,M_2N,分别达到489kg·hm~(-_2)·a~(-1)、440._2 kg·hm~(-_2)·a~(-1).综合结果表明,化肥、有机肥配施所产生交互效应更有利于棕壤有机碳储量的增加及固碳速率的提高.
Based on the long-term experiment of brown soil fertilizers, the content and storage characteristics of organic carbon in 0-60 cm soil layer and the carbon sequestration rate of soil under different fertilization conditions were studied.The experiment consists of 6 treatments, ie, application of N, P, M_2NP, M_2N, M_2, N, N and CK were studied.The results showed that after 31 years of long-term Under different fertilization treatments, the profile distribution of soil organic carbon (SOC) content and storage of all treatments showed a decreasing trend with the increase of soil depth. Under the conditions of this experiment, organic matter (organic matter) of M 2 NP, M 2 N, M 2, NP, N and CK The carbon enrichment coefficients were 0.465,0.455,0.407,0.48_2,0.393,0.471, respectively, indicating that the topsoil maintained the strongest organic carbon, and the soil organic carbon storage in the 0-60 cm soil layer showed M_2NP and M_2N> M_2 , NP> N> CK, organic manure and chemical fertilizer could significantly increase soil organic carbon content and reserves.Compared with the pre-experiment, soil organic carbon content and storage of CK decreased significantly.Each treatment carbon index (CPMI) showed M_2NP> M_2N> M_2> N> NP> CK. Soil carbon sequestration The results showed that the net carbon release rate of CK was -401.4 kg · hm ~ (-2) · a -1 and the highest carbon sequestration rate was M_2NP, M_2N, Respectively, reached 489kg · hm-2-a -1 and 440._2 kg · hm-2-a · -1, respectively.The comprehensive results showed that the interaction between fertilizers and organic manures The effect is more conducive to the increase of brown carbon organic carbon storage and carbon sequestration rate.