氮肥形态及用量对土壤砷生物有效性的影响研究

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	氮肥形态及用量对土壤砷生物有效性的影响研究
	李莲芳; 耿志席; 苏世鸣; 王亚男; 段然; 吴翠霞; 刘小诗
刊名	农业环境科学学报
	2013
卷号	32 期号:7 页码:1341-1347
关键词	砷污染土壤氮肥生物有效性
ISSN号	1672-2043
其他题名	Influence of Application Amount and Category of Nitrogen Fertilizer on the Arsenic Bioavailability in Soil
英文摘要	通过盆栽试验,探讨了高砷红壤中施用碳酸氢铵、尿素和硝酸钙3种不同形态氮肥对土壤砷生物有效性及小白菜吸收砷的影响。结果表明:在175、350 mg·kg~(-1)两种施氮水平下,不同形态氮肥的施用均显著(P<0.05)促进了小白菜(Brassica chinensis)植株的生长,生物量的增加幅度为104.5%~224.3%;氮肥施用显著增加了土壤中有效态砷含量和植物对砷的吸收(P<0.05),与对照相比,不同形态氮肥处理下土壤有效态砷含量增加了30.5~49.4倍,其中,以施氮量为350 mg·kg~(-1) Ca(NO_3)_2处理增幅最大,NH_4HCO_3的350 mg·kg~(-1)施氮处理的增幅较小;在3种氮肥形态的2种施氮量处理下,植物地上部砷吸收量比对照增加0.75~4.32倍,且以175 mg·kg~(-1) NH_4HCO_3和350 mg·kg~(-1)Ca(NO_3)_2的施氮处理较高,而350 mg·kg~(-1) CO(NH_2)_2和175 mg·kg~(-1)Ca(NO_3)_2施氮处理的植物砷浓度及吸收量均相对较低。随着化学氮肥的施用,发生了土壤残渣态的砷向易溶态等其他形态砷的转化和释放,导致作物吸收砷及相应的环境风险增加。; Through pot experiment,the influence of nitrogen fertilizer application including NH_4HCO_3, CO(NH_2)_2 and Ca(NO_3)_2 on the availability of arsenic in red soils and arsenic uptake by Brassica chinensis was conducted. The results indicated that the plant biomass was significantly improved due to the application of these three kinds of nitrogen fertilizer at 175 mg N·kg~(-1), 350 mg N·kg~(-1) added level with the increased percentage of 104.5%~224.3% compared to control(CK) without N added. Under different N application treatments, the available arsenic in soils and plant accumulation of arsenic all increased significantly at P<0.05 significant level. Under different N application treatments, the available amount of arsenic in soils was 30.5~49.4 times more than that of control, and the highest amount appeared in the 350 mg N·kg~(-1) Ca(NO_3)_2 treatment, and the least amount occurred for the 350 mg·kg~(-1) NH_4HCO_3 treatment. The uptake amount through the harvest crop was 0.75~4.32 times that of control. And the relatively high amount appeared in 175 mg N·kg~(-1) NH_4HCO_3 and 350 mg N·kg~(-1) Ca(NO_3)_2 treatments. The least arsenic concentration in plant and arsenic amount obtained from the harvested crop occurred for 350 mg N·kg~(-1) CO(NH_2)_2 treatment and 175 mg N·kg~(-1) Ca(NO_3)_2 treatment. With the application of these three kinds of nitrogen fertilizer, transformation from residual fraction into other four fractions like soluble arsenic and corresponding release of arsenic from soils was observed from this study, indicating the arsenic uptake amount by crops and environmental risk increased.
学科主题	农业基础科学
语种	中文
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/16994]
专题	农业环境与可持续发展研究所_环境修复研究室
作者单位	中国农业科学院农业环境与可持续发展研究所, 农业部农业环境重点实验室, 北京, 100081
推荐引用方式 GB/T 7714	李莲芳,耿志席,苏世鸣,等. 氮肥形态及用量对土壤砷生物有效性的影响研究[J]. 农业环境科学学报,2013,32(7):1341-1347.
APA	李莲芳.,耿志席.,苏世鸣.,王亚男.,段然.,...&刘小诗.(2013).氮肥形态及用量对土壤砷生物有效性的影响研究.农业环境科学学报,32(7),1341-1347.
MLA	李莲芳,et al."氮肥形态及用量对土壤砷生物有效性的影响研究".农业环境科学学报 32.7(2013):1341-1347.