腐殖酸与生物质碳对土壤磷素活化及无机磷形态转化的影响

Effects of Humic Acid and Biomass Carbon on Phosphorus Activation and Inorganic Phosphorus Form Transformation in Soil

【目的】探究腐殖酸、生物质碳对土壤磷素活化及无机磷形态转化的影响,为增效磷肥的研发提供理论依据。【方法】以腐殖酸、生物质碳为试验材料,以1、2 g/kg土的配比与磷肥及供试土壤充分混匀,进行持续60 d的土壤培养试验,以研究腐殖酸与生物质碳对土壤磷素活化及无机磷各形态转化的影响。【结果】与CK2、CK1相比,施用腐殖酸、生物质碳各处理的土壤速效磷含量、磷素活化系数及土壤无机磷组分中的Fe-P、Al-P含量提高,而Ca-P和O-P含量均不同程度降低。土壤培养18、30、45 d,各处理较CK2、CK1对土壤速效磷含量有显著影响,其中P2S2处理的速效磷含量比CK2高20.67%,P1F2处理比CK1高69.83%;P2S2处理培养30、45、60 d的土壤Al-P含量与CK2均有显著差异,分别比CK2高61.40%、14.79%、17.77%;相关分析表明,土壤速效磷含量与磷素活化系数、Al-P呈极显著正相关关系。供试土壤在不同配比的腐殖酸与生物质碳的作用下,各形态无机磷所占比例依次为Fe-P> Ca-P> Al-P> O-P。【结论】在两个施磷水平下,施用腐殖酸与生物质碳均可增加土壤速效磷含量、磷素活化系数,促进土壤无机磷组分Fe-P、Al-P含量增加,活化土壤中被固定的磷,有利于O-P向有效态转化,显著提高土壤磷的有效性。

【Objective】The study was conducted to explore the effects of humic acid and biomass carbon on soil phosphorus activation and inorganic phosphorus form transformation with a view to providing theoretical basis for the research and development of synergistic phosphorus fertilizers.【Method】Taking humic acid and biomass carbon as the test materials,with the ratio of 1 g/kg and 2 g/kg soil and phosphate fertilizer and fully mixing with the test soil,a soil culture test was carried out for 60 days to study the effects of humic acid and biomass carbon on the activation of soil phosphorus and the transformation of various forms of inorganic phosphorus.【Result】Compared with CK2 and CK1 treatments,soil available phosphorus content,phosphorus activation coefficient and Fe-P and Al-P contents of soil inorganic phosphorus components increased,while the contents of Ca-P and O-P decreased to varying degrees.On the 18;,30;and 45;day of the soil culture test,each treatment had a significant effect on the content of soil available phosphorus compared with CK2 and CK1.The content of available phosphorus in P2S2 treatment was significantly higher than that in CK2 treatment by 20.67%,and that in P1F2 treatment was significantly higher than that in CK1 treatment by 69.83%.On the 30;,45;and 60;day of the test,the content of soil Al-P in P2S2 treatment was significantly higher than that in CK2 treatment by 61.40%,14.79%,and 17.77%;.Correlation analysis showed that soil available phosphorus had a very significant positive correlation with phosphorus activation coefficient and Al-P.Under the action of different ratios of humic acid and biomass carbon,the proportion of inorganic phosphorus in each form ranked as Fe-P>Ca-P>Al-P>O-P.【Conclusion】Under two phosphorus application levels,both humic acid and biomass carbon can increase the content of soil available phosphorus and phosphorus activation coefficient,promote the contents of Fe-P and Al-P of inorganic phosphorus components in soil,and activate the fixed phosphorus in soil,which is conducive to the conversion of O-P to the available state and significantly improves the availability of soil phosphorus.