摘要:
采用野外调查和室内分析相结合的方法,研究菌渣施用对茶园土壤有机碳含量及其腐殖质组成的影响。试验设计4个处理,分别为单施氮肥(M0)、50%氮肥+50%菌渣有机肥(M1)、全量菌渣有机肥(M2)和2倍菌渣有机肥(M3)。结果表明:连续3年施用菌渣有机肥后,茶园表层(0~20cm)土壤有机碳含量、胡敏酸(HA)、富里酸(FA)和胡敏素(HM)含量均有一定程度的增加,较M0处理分别增加43.10%~104.21%、52.89%~157.14%、31.07%~74.30%和44.96%~107.35%,几乎随着菌渣有机肥施用量的增加而增加,20~40cm土层影响不显著。土壤胡敏酸的△logK和E4/E6值均有增加,其中M2和M3处理显著增加,而富里酸的△logK和E4/E6各处理间差异均不显著,说明腐殖化过程较慢。研究表明施用菌渣有机肥不仅更有利于茶园土壤有机碳的积累,而且能促进上壤腐殖化进程。
Abstract:
Based on the field survey and laboratory analysis,the effect of applying spent mushroom culture residues to tea garden was investigated on the soil in organic carbon content and humus composition.There were 4treatments including:only applying nitrogen fertilizer(M0),50% nitrogen fertilizer+50% spent mushroom culture residues(M1),only spent mushroom culture residues as fertilizer(M2)and double amount spent mushroom culture residues(M3).The results showed that the soil organic carbon,humic acid(HA),fulvic acid(FA)and humin(HM)were increased in 0-20 cm soil layer by applying spent mushroom culture resides as fertilizer for three years.Comparing with applying nitrogen fertilizer alone(M0),the indices were increased for 43.10%-104.21%,52.89%-157.14%,31.07%-74.30% and 44.96%-107.35%,respectively.These increases were not detected significantly in 20-40 cm soil layer.The E4/E6 ratio and△logK of soil increased significantly in humic acid for M2 and M3treatments but not in fulvic acid of various treatments.The findings indicate that applying spent mushroom culture residues as fertilizer may conduce to organic carbon accumulation in the soil,in addition to promote the process of soil humification.
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