腐殖酸水溶肥应用于重金属污染稻田的效果研究

Effect of Water Soluble Humic Acid Fertilizer on Heavy Metal Polluted Rice Field

【目的】本研究为指导腐殖酸水溶肥对重金属污染农田的修复治理及其大面积的推广应用提供理论依据。【方法】采用田间小区试验,选择湖南浏阳镉(Cd)砷(As)铅(Pb)复合污染稻田,研究腐殖酸水溶肥的修复效果。【结果】施用150~900 kg·hm-2的水稻产量比对照增产6.31%~8.43%(P<0.05);低量(75~150 kg·hm-2)施用腐殖酸水溶肥显著促进了水稻Cd吸收,高量(600~900 kg·hm-2)施用则可显著降低水稻Cd含量,施用腐殖酸水溶肥75和150 kg·hm-2的稻米Cd含量分别增加了12.24%(P<0.05)和15.21%(P<0.05),施用600和900 kg·hm-2的稻米Cd含量分别降低了28.28%(P<0.05)和29.63%(P<0.05);施用腐殖酸水溶肥可减少水稻As和Pb的积累,施用腐殖酸水溶肥150~900 kg·hm-2的稻米As、Pb含量分别下降了33.96%~44.92%(P<0.05)和21.38%~27.90%(P<0.05)。【结论】水稻增产和重金属含量降低综合效果表明,施用腐殖酸水溶肥600~900 kg·hm-2可确保水稻显著增产的同时,同步降低稻米Cd、As、Pb含量。

【Objective】This study provides a theoretical basis for guiding the remediation and treatment of heavy metal polluted farmland by humic acid water-soluble fertilizer and its widespread application.【Method】A field experiment was conducted to study the remediation effect of humic acid water-soluble fertilizer in Liuyang,Hunan Province.【Result】The rice yield was significantly increased by the application of water soluble humic acid fertilizer,and the yield of rice with 150-900 kg·hm-2was increased by 6.31%-8.43%compared with the control(P<0.05).The application of humic acid water-soluble fertilizer(75-150 kg·hm-2)significantly promoted the absorption of Cd in rice,while the application of humic acid water-soluble fertilizer(600-900 kg·hm-2)significantly reduced the content of Cd in rice.The application of humic acid water-soluble fertilizer(75 kg·hm-2)and 150 kg·hm-2 increased 12.24%(P<0.05)and 15.21%(P<0.05)respectively,and the application of 600 and 900 kg·hm-2 reduced 28.28%respectively(P<0.05)and 29.63%(P<0.05);Application of humic acid water-soluble fertilizer could reduce the accumulation of As and Pb in rice,and the content of As and Pb in rice decreased by 33.96%-44.92%(P<0.05)and 21.38%-27.90%(P<0.05)respectively.【Conclusion】The comprehensive effects of increasing rice yield and reducing heavy metal content showed that the application of humic acid water-soluble fertilizer 600-900 kg·hm-2 could ensure the significant increase of rice yield and simultaneously reduce the Cd,As and Pb contents of rice.