摘要
水合氧化铁是一种弱晶质三价铁氧化物,可用来减少稻田甲烷(CH_4)的排放。采用水稻盆栽试验,研究水合氧化铁的提前施用对持续淹水条件下水稻CH_4排放的影响。结果表明:水合氧化铁在水稻移栽前47 d施用,加Fe处理的全生育期CH_4总排放通量比对照减少17.52%,其CH_4减排效应仅出现于水稻生长后期。在移栽后第70天,加Fe处理的根孔隙度、根表铁膜含量和单株根表铁膜数量均显著高于对照,而稻根产CH_4速率则显著低于对照。因此,提前施用水合氧化铁能够通过促进植株介导的根表铁膜的形成抑制稻根的产CH_4潜力,进而实现持续淹水条件下水稻CH_4的减排。
Ferrihydrite, as a form of poorly crystalline ferric iron oxides, can be used as a strategy for mitigation of methane emission from rice paddies. The pot experiment was conducted to study the effect of pre-application of ferrihydrite on methane emission in a rice（Oryza sativa L.） soil under continuous flooding regime. Ferrihydrite at a rate of 0.7 g/kg dry weight soil was added to the pots 47 days prior to transplanting. The seasonal methane emission in Fe-amended pots was 17.52% lower than the control without Fe amendment. Methane suppression by Fe amendment occurred only in the late growing season. At the 70 th day after transplanting, Fe amendment resulted in a significant increase in rice root porosity, content of iron plaque on roots, and amount of iron plaque on roots of a plant, but a significant decrease in methane production rate of roots. In conclusion, ferrihydrite applied in advance could mitigate methane emission from a continuously flooded paddy soil by enhancing plant-mediated formation of iron plaque on roots and subsequently decreasing methane production potential of roots.
作者
任杰
唐璐
陈菊培
但建国
REN Jie;TANG Lu;CHEN Jupei;DAN Jianguo(Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, Hainan 570228, Chin)
出处
《热带作物学报》
CSCD
北大核心
2018年第4期635-640,共6页
Chinese Journal of Tropical Crops
基金
国家自然科学基金(No.31260118)
关键词
甲烷
水稻
水合氧化铁
铁膜
根孔隙度
methane
rice
ferrihydrite
iron plaque
root porosity
