添加EDTA及黄腐酸对水稻土中有效磷浓度的影响  

Effect of EDTA,fulvic acid and iron oxides on available phosphate concentration in paddy soils

作　　者：曲东[1] 曹宁[1] 王保莉[2] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨陵712100 [2]西北农林科技大学生命科学学院,陕西杨陵712100

出　　处：《西北农林科技大学学报（自然科学版）》2003年第3期127-130,共4页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家自然科学基金资助项目 ( 4 0 14 10 0 5 ;40 2 710 67) ;陕西省自然科学基金资助项目 ( 2 0 0 0 SM11)

摘　　要：通过吉林、四川、江西和广东 4种水稻土的室内厌氧模拟培养试验 ,测定了添加作为络合剂及电子穿梭物质的 EDTA、黄腐酸及人工合成氧化铁后土壤中有效磷浓度的变化。结果表明 ,厌氧培养条件下不同土壤中有效磷的释放不同。与土壤中铁还原趋势相似 ,随着厌氧培养时间的增加 ,土壤中有效磷浓度将逐渐增大 ,表明厌氧还原条件可以增加土壤磷素的有效性。加入氧化铁后 ,4种土壤中有效磷的浓度均显著降低 ,说明氧化铁对土壤磷素的固定强烈。添加 EDTA和黄腐酸溶液可以显著增加吉林、四川和江西土壤中有效磷的含量 。Under the anaerobic condition,the changes of available phosphate in Jilin,Sichuan,Jiangxi and Guangdong paddies were determined,and the effect of EDTA,fulvic acid and iron oxides on available phosphate concentration in different paddies was also measured.The results showed that the release of available phosphate was different in different slurries.The amount of available phosphate,like Fe(Ⅱ),increased with the increase of anaerobic incubation time.It showed that anaerobic incubation might increase the concentration of available phosphate.Available phosphate concentrations in these four paddy slurries were significantly lower than control when iron oxides were added to them.EDTA and fulvic acid may increase available phosphate concentration in Jilin,Sichuan,Jiangxi paddy slurries,but can affect slightly on Guangdong paddy slurries.

关 键 词：水稻土 有效磷浓度 EDTA 黄腐酸 氧化铁 厌氧培养 铁还原 

分 类 号：S158[农业科学—土壤学] S155.292[农业科学—农业基础科学]