长期施用有机肥对苏打盐碱土胶体组分及有机无机复合状况的影响

Effects of Long-term Application of Organic Fertilizer on Colloid Components and Organic-Mineral Composition of Soda Saline-alkali Soil

基于松嫩平原苏打盐碱土有机肥长期改良试验,以未施用有机肥为对照(CK),研究不同改良年限(4,11,15,20 a)对土壤胶体组分、土壤有机碳组分及土壤有机无机复合程度的影响。结果表明,随着改良年限的增加,土壤水分散组胶体(G_(0))含量显著降低(P<0.05),而土壤钙结合的复合体(G_(1))含量显著增加(P<0.05),土壤铁铝氧化物结合的复合体(G_(2))含量及(G_(0)+G_(1)+G_(2))含量并无显著性变化;G_(0)、G_(1)和G_(2)组有机碳含量随改良年限的增加均呈增加趋势。与CK相比,施用有机肥处理显著提升了土壤有机碳和重组有机碳含量(P<0.05),并分别在4,11 a处理中达到最大值。改良年限在11 a及以上处理的复合体对土壤固碳的总贡献率为35.51%~54.64%。相对于CK,施用有机肥处理的苏打盐碱土有机无机复合程度均有不同程度提高,改良11 a及以上处理其增幅明显。综上所述,长期施用有机肥促进了苏打盐碱土水分散组胶体向水稳性复合体转化,显著增加了复合体对土壤固碳的贡献率,也显著提升了土壤的有机无机复合程度。

Based on the long-term improvement experiment of organic fertilizer of soda saline-alkali soil in Songnen Plain,the effects of different improvement years(4,11,15,20 a)on soil colloid components,soil organic carbon components and soil organic-mineral compound degree were studied with no improvement as the control(CK).The results showed that with the increase of improvement years,the colloidal content of soil water dispersive group(G_(0))decreased significantly(P<0.05),while that of soil calcium-binding complex(G_(1))increased significantly(P<0.05);there were no significant changes in colloid content of soil iron and aluminum oxide binding complex(G_(2))and(G_(0)+G_(1)+G_(2))content of different treatments;the organic carbon content in G_(0) group,G_(1) group and G_(2) group showed an increasing trend.Organic carbon content and heavy fraction organic carbon content of all organic fertilizer treatments were significantly increased compared with CK(P<0.05).In all treatments,organic carbon content in 4 a treatment was the highest,and heavy fraction organic carbon content in 11 a treatment was the highest.The total contribution rate of soil carbon sequestration of the treatments complexes with improved years of 11 a or more was 35.51%-54.64%.Compared with CK,organic-mineral compound degree of soda saline-alkali soil treated with organic fertilizer increased to varying degrees,and the increase was obvious in the treatment of 11 a and above.In conclusion,the long-term application of organic fertilizer promoted the transformation of water dispersive colloid of soda saline-alkali soil to water stable complex,significantly increased the contribution rate of the complex to soil carbon fixation,and significantly improved the degree of organic-mineral composition of the soil.