赤泥施用量对Cd污染稻田水稻产量和土壤生物性状的影响

采用盆栽试验方法,以不施赤泥为对照,分析不同赤泥施用量对Cd污染稻田水稻产量和土壤生物性状的影响.结果表明,施适宜用量赤泥能提高水稻有效穗和促进水稻生长,实现水稻增产,与不施赤泥处理相比,RM-2处理(0.5%赤泥)的水稻株高、有效穗、结实率和水稻产量分别提高了3.40%,4.20%,3.87%和6.86%.从分蘖期到成熟期,施用赤泥处理各生育期的水稻土微生物量碳、氮明显高于对照RM-0处理的.其中,RM-2处理(0.5%赤泥)各时期水稻土微生物量C(SMBC)、微生物量N(SMBN)都明显高于RM-0处理的(P<0.01).施用赤泥处理的稻田土壤细菌、真菌和放线菌数量多数情况下高于对照RM-0处理的.RM-2处理土壤细菌、真菌和放线菌菌群数量多数情况下高于其他处理的.RM-2处理土壤脲酶活性、酸性磷酸酶活性和过氧化氯酶活性均为最高,分别比RM-0处理的提高了10.5%,32.4%和15.9%,且两处理间差异均达到显著水平(P<0.05).与RM-0处理相比,施用赤泥各处理pH和阳离子交换量均有不同程度增加,但有机质的变化不明显.0.5%(W/W)的赤泥施用量较其他施用量有利于改善Cd污染水稻土生物性状,提高土壤肥力,增加水稻产量.

Effect of Application on Different Amount of Red Mud on Rice Yield and Soil Biological Properties in Cd-contaminated Paddy Soil

A pot experiment was conducted to study the effect of application of different amount of red mud on rice yield and the soil biological properties in Cd-polluted paddy soil,with no red mud application as the control(RM-0).The results indicated that appropriate application of red mud could apparently promote rice growth and increase effective panicles and rice yield.With no red mud application as the control(RM-0),plant height,effective panicles,seed setting rate and rice yield in RM-2 treatment(0.5% red mud)...