农业环境科学学报
農業環境科學學報
농업배경과학학보
Journal of Agro-Environment Science
2010年
z1期
20-25
,共6页
Cd%小白菜%化肥%有机肥%生理生化特性%生物累积
Cd%小白菜%化肥%有機肥%生理生化特性%生物纍積
Cd%소백채%화비%유궤비%생리생화특성%생물루적
cadmium%pakchoi%mineral fertilizer%organic fertilizer%physiological and biochemical characteristics%bio-accumulation
采用土培盆栽试验研究了在施化肥和有机肥的条件下,不同浓度Cd胁迫对小白菜生理生化特性及生物累积效应的影响.结果表明,在施肥的条件下,土壤中添加0～25 mg·kg~(-1)的外源Cd时,小白菜生物量表现为Cd低浓度处理(≤5 mg·kg~(-1)时升高,高浓度处理(≥10 mg·kg~(-1)时降低的趋势;叶绿素含量也表现出低浓度(≤10 mg·kg~(-1) 处理升高,高浓度(≥25 mg·kg~(-1)处理降低的趋势;Vc含量随Cd处理浓度的增大逐渐下降;MDA含量及Cd在小白菜体内的累积量与Cd处理浓度正相关,且根部Cd的累积量高于地上部.与化肥相比,有机肥在一定程度上可以缓解Cd对小白菜生物量、叶绿素、Vc、膜结构破坏等的毒害作用,降低土壤中Cd的生物有效性,因为施有机肥条件下小白菜对镉的吸收率较低.关于有机肥对Cd胁迫的缓解机理还需进一步研究.
採用土培盆栽試驗研究瞭在施化肥和有機肥的條件下,不同濃度Cd脅迫對小白菜生理生化特性及生物纍積效應的影響.結果錶明,在施肥的條件下,土壤中添加0～25 mg·kg~(-1)的外源Cd時,小白菜生物量錶現為Cd低濃度處理(≤5 mg·kg~(-1)時升高,高濃度處理(≥10 mg·kg~(-1)時降低的趨勢;葉綠素含量也錶現齣低濃度(≤10 mg·kg~(-1) 處理升高,高濃度(≥25 mg·kg~(-1)處理降低的趨勢;Vc含量隨Cd處理濃度的增大逐漸下降;MDA含量及Cd在小白菜體內的纍積量與Cd處理濃度正相關,且根部Cd的纍積量高于地上部.與化肥相比,有機肥在一定程度上可以緩解Cd對小白菜生物量、葉綠素、Vc、膜結構破壞等的毒害作用,降低土壤中Cd的生物有效性,因為施有機肥條件下小白菜對鎘的吸收率較低.關于有機肥對Cd脅迫的緩解機理還需進一步研究.
채용토배분재시험연구료재시화비화유궤비적조건하,불동농도Cd협박대소백채생리생화특성급생물루적효응적영향.결과표명,재시비적조건하,토양중첨가0～25 mg·kg~(-1)적외원Cd시,소백채생물량표현위Cd저농도처리(≤5 mg·kg~(-1)시승고,고농도처리(≥10 mg·kg~(-1)시강저적추세;협록소함량야표현출저농도(≤10 mg·kg~(-1) 처리승고,고농도(≥25 mg·kg~(-1)처리강저적추세;Vc함량수Cd처리농도적증대축점하강;MDA함량급Cd재소백채체내적루적량여Cd처리농도정상관,차근부Cd적루적량고우지상부.여화비상비,유궤비재일정정도상가이완해Cd대소백채생물량、협록소、Vc、막결구파배등적독해작용,강저토양중Cd적생물유효성,인위시유궤비조건하소백채대력적흡수솔교저.관우유궤비대Cd협박적완해궤리환수진일보연구.
Pot experiments were conducted to study the effects of cadmium on physiological, biochemical characteristics and bio-accumulation of pakchoi under chemical or organic fertilizing. The experimental results showed that when cadmium was added to the soil with levels between 0 mg·kg~(-1) soil and 25 mg·kg~(-1) soil, biomass of pakchoi increased at Cd amounts≤ 5 mg·kg~(-1) soil, but decreased when Cd was≥10 mg·kg~(-1) soil. Chlorophyll content of pakchoi increased at Cd amounts≤10 mg·kg~(-1) soil, but decreased when Cd was≥25 mg·kg~(-1) soil. Vc content of pakchoi decreased as the amount of cadmium increased. MDA content and cadmium concentration in pakchoi were positively correlated with the amount of cadmium applied to soil and cadmium concentration was higher in roots than in aerial part of pakchoi. The result also indicated that the toxic effect of Cd on pakchoi and the biological availability of soil Cd both reduced in the presence of organic fertilizer compare to chemical fertilizer due to the uptake efficiency of Cd by pakchoi was lower under organic fertilizer than chemical fertilizer conditions. More research is needed to study the mechanisms of the reduction of toxicity effect and Cd accumulation in pakchoi with the application of organic fertilizer.
