摘要
为了探究不同水分管理条件下硫素对水稻土壤磷素有效性的影响,采用室内土壤模拟培养试验,共设4个处理:淹水(YS)、淹水+硫磺(YS S)、干湿交替(GS)以及干湿交替+硫磺(GS S),通过测定土壤pH、Eh、Fe2+、Olsen-P、无机磷组分、有机磷组分和磷酸酶活性,并对各数据进行相关性进行分析.结果表明,土壤Olsen-P含量在30 d时达到峰值,培养60 d时,YS S处理Olsen-P含量最高,相较于YS提高10.65%;培养60 d时,YS S处理和GS S处理中Fe-P含量均高于未添加硫磺处理组;淹水条件下添加硫磺能够降低土壤pH值,较空白处理降低0.05个单位;同时能显著降低土壤Eh值,较空白处理降低12.85%,即淹水条件下硫磺的添加促进S向S2-还原;YS S处理中LOP和MLOP含量显著提高,而MSOP含量显著降低;淹水条件下添加硫磺增加土壤中酸性磷酸酶活性.本研究表明,在淹水处理条件下添加硫磺更有利于土壤中Ca-P和O-P向Fe-P有效转化,有效提高土壤LOP和MLOP含量,提高水稻土的供磷能力,以此提高水稻土中磷的有效性.
Abstract
In order to investigate the effect of sulfur on the phosphorus effectiveness in rice soil under dif-ferent water management conditions,an indoor soil simulation incubation experiment was conducted.The exper-iment featured four treatments:flooded (YS),flooded+sulfur (YS S),wet and dry (GS) and wet and dry+sulfur (GS S),which was performed by determining the soil pH,Eh,Fe2+,Olsen-P,inorganic phosphorus components,organophosphorus components,phosphatase activities,followed by correlation and analysis of the data.The re-sults showed that the soil Olsen-P content peaked at 30 days,and the Olsen-P content in YS treatment was the highest at 60 days of culture,which increased by 10.65% compared with YS.After 60 days of incubation,the Fe-P contents in YS and GS S treatments were higher than that in the group without sulfur treatment.The addition of sulfur under flooded conditions could reduce soil pH value,which was 0.05 units lower than that of the blank con-trol,and could significantly reduce soil Eh value,which was 12.85% lower than that of the blank control,that is,the addition of sulfur under flooded conditions promotes S to S2-reduction,and the LOP and MLOP contents in YS S treatment were significantly increased,while the MSOP content was significantly reduced.The addition of sulfur under flooded conditions increased the acid phosphatase activity in soil.The study concluded that the addition of sulfur under flooded treatment conditions is more conducive to the effective conversion of Ca-P and O-P to Fe-P in soil,effectively increasing soil LOP and MLOP content,and improving the phosphorus supply capacity of paddy soil,thereby improving the effectiveness of phosphorus in paddy soil.
基金项目
国家重点研发计划课题(2023YFD1700205)
安徽省教育厅重点项目(2022AH050886)
安徽省科技重大专项(202103a06020012)
维普
万方数据