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为探讨冬季绿肥改良土壤的生态效应及确定合适比例的氮肥与绿肥翻压量,在“冬季绿肥-双季稻”复种型农作制度基础上,设置4×4双因素试验,研究不同紫云英翻压量和施氮水平对土壤活性有机碳库各组分及碳库管理指数的影响.结果表明:单施绿肥能够显著促进土壤总有机碳和活性有机碳的累积.与对照相比,单施绿肥处理土壤总有机碳含量和活性有机碳含量分别平均增加22.2%、26.7%,但单施氮肥处理的土壤有机碳含量下降了0.6%~3.4%.与不施肥相比,单施绿肥和绿肥氮肥配施处理的土壤碳库管理指数分别平均增加了24.55和15.17,而单施氮肥处理减少了2.59.单施绿肥、绿肥氮肥配施和单施氮肥处理的土壤平均微生物生物量碳分别比对照高54.0%、95.2%和14.3%.活性有机碳含量与碳库管理指数存在极显著(P<0.01)的相关性,与可溶性有机碳、微生物生物量碳也存在显著的相关性(P<0.05).水稻产量与活性有机碳含量和碳库管理指数均存在极显著的相关性,且相关系数明显大于总有机碳.可见在当地土壤肥力条件下,施有机肥或有机无机肥适当配施能提高土壤有机碳含量和土壤碳库管理指数,有利于改善土壤质量,提高土壤肥力.
In order to explore the ecological effect of green manure improving soil in winter and determine the appropriate proportion of nitrogen fertilizer and green manure turning over amount, a 4 × 4 two-factor experiment was set up on the basis of “winter green manure-double cropping rice” The results showed that the application of green manure could significantly promote the accumulation of soil total organic carbon and active organic carbon.Compared with the control Compared with the non-fertilization, the total organic carbon and the content of active organic carbon increased by 22.2% and 26.7%, respectively, while the soil organic carbon content decreased by 0.6% ~ 3.4% The management index of soil carbon pool increased by 24.55 and 15.17, respectively, compared with the single application of nitrogen fertilizer, and decreased by 2.59. The average microbial biomass of single soil with green manure, green manure application and single manure application Carbon were 54.0%, 95.2% and 14.3% higher than that of the control respectively.The correlation between active organic carbon and carbon stock management index was significant (P <0.01), and also with soluble organic carbon and microbial biomass carbon (P < 0.05) .There was a significant correlation between rice yield and active carbon and carbon stock management index, and the correlation coefficient was significantly greater than total organic carbon.It can be seen that under the condition of local soil fertility, organic manure or organic manure Can improve soil organic carbon content and soil carbon pool management index, is conducive to improving soil quality, improve soil fertility.