摘要
为了更好地了解间作系统对受持久性有机污染物污染的农业土壤的生物修复效率及其机制,运用室内盆栽试验,研究了南瓜(Cucurbita moschata)、大豆[Glycine max(L.)Merr.]和玉米(ZeamaysL.)3种植物的单作和两两间作强化多氯联苯污染赤红壤的根际修复效应。结果表明:植物不同种植方式均对根际土壤中PCB的减量有促进作用,单作的土壤PCB单位残留量是对照的70.25%～92.11%,间作的土壤PCB单位残留量是对照的61.44%～80.53%。其中,大豆、玉米间作效果最好,根际修复土壤PCB单位残留量是对照的61.44%,显著低于对照。各种植方式中植物地上部吸收积累的多氯联苯符合中国食品安全标准的限值。各处理根际土壤的荧光素二乙酸酯酶、脱氢酶、过氧化氢酶活性和Eh、C/N均与对照差异显著。相关分析结果表明,根际土壤PCB残留量与FDA酶、过氧化氢酶活性、C/N呈极显著负相关,与多酚氧化酶、Eh呈显著负相关。
In order to better understand the bioremediation efficiency and its mechanism of co-cropping systems in agricultural soils contaminated by POPs （persistent organic pollutants）, a greenhouse experiment under both single cropping and intercropping conditions with 3 plants including pumpkin （Cucurbita moschata）, soybean [Glycine max （L.） Merr.] and maize （Zea mays L.） were conducted in a PCB contaminated lateritic red soil. The results indicated that the phytoremediation was good to the degradation of PCB in the soil and the co-cropping. The PCB coneentration in the soil of monocropping was 70.25%-92.11% of control. The soil biodegradation of PCB was significantly enhanced under intercropping conditions with PCB concentration of 61.44%-80.53% of control. Especially, it was the best effect in a soybean-maize intercropping system, significantly lower than control. In addition, accumulation of PCB in aboveground of all plants complied with the limit values of China Food Safety Standards. Under different cropping patterns, the fluorescein diacetate （FDA）, dehydrogenase （DHO）, eatalase （CAT） and Eh, C/N had significant differences with control. From thecorrelation analysis, it showed that the PCB concentration in soil had extremely significant negative correlation with fluorescein diacetate （FDA）, dehydrogenase （DHO）, catalase （CAT） and C/N, and significant negative correlation with polyphenol oxidase （PPO） and Eh.
出处
《中国农学通报》
CSCD
2012年第36期128-134,共7页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金项目(30670380
30870413)
农业部生态农业重点开放实验室基金项目(2009-K07)
关键词
植物间作
根际修复
多氯联苯
plant intercropping
rhizo-remediation
PCB
