植物营养与肥料学报Issue(3)：651-660,10.DOI:10.11674/zwyf.2014.0317
Fe2＋对水稻生长及土壤微生物活性的影响
Effects of exogenous ferrous on rice growth and soil microbial activities
摘要
Abstract
In this study , the effect of exogenous ferrous ( Fe2+) on the rice physiological indices , soil microbial activities and its bioecological characteristic at seedling and tillering stage in the interaction system between soil -rice-ferrous and microbe was investigated by a pot experiment in greenhouse , where the ferrous toxicity in waterlogged paddy soil was simulated .Ferrous with six different levels including 0, 100, 200, 400, 800 and 1600 mg/kg was applied respectively in paddy soil .The results showed that the addition of exogenous Fe 2+gradually inhibited the growth of rice and decreased the activities of soil microorganism , while the background concentration of Fe2 +in the normal tested paddy soil was 207.77 mg/kg.The plant height and dry matter accumulation of rice decreased significantly when the concentration of exogenous Fe 2+exceeded 100 mg/kg.However, SPAD value representing the content of chlorophyll in the leaf of rice , proline accumulation and activities of antioxidant enzyme systems increased obviously , suggesting that exogenous Fe 2+100 mg/kg was the critical concentration leading to damage on growth in this experiment .Meanwhile , soil microbial activities declined rapidly and then steadily decreased with the increase of the concentration of exogenous Fe 2+.The critical level in decreasing soil microbial activities can be presumed as 100 mg/kg of exogenous Fe 2 +by analyzing its toxicant concentration that inhibits a microbe-mediated ecological process by 50%(EC50).Soil microbial activities and rice growth in the system of soil-rice-ferrous and microbe were significantly associated and synchronously affected by the ferrous in tested soil . Overall , exogenous Fe 2+of 100 mg/kg was the critical concentration in inhibiting rice growth and soil microbial activities in tested soil .Therefore , based on this result , the concentration of ferrous toxicity in tested paddy soil can be presumed as about 300 mg/kg, which includes the background level .Some reasonable agronomic measures should be considered in controlling the negative effects when the concentration of ferrous iron exceeds such concentration in the test paddy soil.关键词
亚铁离子/水稻生理指标/土壤微生物量/土壤微生物量碳Key words
ferrous ions/rice physiological indices/soil microbial amount/soil microbial biomass C分类
农业科技引用本文复制引用
陈娜,廖敏,张楠,徐培智,解开治,徐昌旭,刘光荣..Fe2＋对水稻生长及土壤微生物活性的影响[J].植物营养与肥料学报,2014,(3):651-660,10.基金项目
国家公益性行业（农业）专项（201003059）资助。 （）
