生态环境学报
生態環境學報
생태배경학보
ECOLOGY AND ENVIRONMENT
2013年
1期
141-146
,共6页
河道底泥%生长基质%养分含量,重金属,吸收积累
河道底泥%生長基質%養分含量,重金屬,吸收積纍
하도저니%생장기질%양분함량,중금속,흡수적루
dredged sediment%artificial substrate%nutritent contents%heavy metal%absorption and accumulation
河道底泥重金属污染是限制底泥资源化利用的主要因素.采用盆栽实验研究了沈阳细河重污染河道底泥与碱性炉渣和锯木屑配比后养分含量变化及对紫花苜蓿(Medicago sativa L.)生长的影响.结果表明:钝化底泥基质中有机质和养分含量较高,能满足植物初期生长所需养分,但相对保肥能力较低.将底泥采用碱性炉煤渣钝化处理后,钝化底泥基质上紫花苜蓿生物量及株高均显著高于纯底泥处理,其中 SD4处理(河道底泥∶燃煤炉渣∶锯木屑=1.0∶1.0∶0.5)中的植株长势最好.所有钝化底泥基质上紫花苜蓿地上部和根部重金属含量极显著降低,而且根部重金属含量显著高于地上部含量.与纯底泥对照相比,钝化底泥基质上紫花苜蓿地上部和根部对重金属 Cd、Cu、Pb、Zn 的富集系数(BCF)和转移系数(TF)均小于1.0.
河道底泥重金屬汙染是限製底泥資源化利用的主要因素.採用盆栽實驗研究瞭瀋暘細河重汙染河道底泥與堿性爐渣和鋸木屑配比後養分含量變化及對紫花苜蓿(Medicago sativa L.)生長的影響.結果錶明:鈍化底泥基質中有機質和養分含量較高,能滿足植物初期生長所需養分,但相對保肥能力較低.將底泥採用堿性爐煤渣鈍化處理後,鈍化底泥基質上紫花苜蓿生物量及株高均顯著高于純底泥處理,其中 SD4處理(河道底泥∶燃煤爐渣∶鋸木屑=1.0∶1.0∶0.5)中的植株長勢最好.所有鈍化底泥基質上紫花苜蓿地上部和根部重金屬含量極顯著降低,而且根部重金屬含量顯著高于地上部含量.與純底泥對照相比,鈍化底泥基質上紫花苜蓿地上部和根部對重金屬 Cd、Cu、Pb、Zn 的富集繫數(BCF)和轉移繫數(TF)均小于1.0.
하도저니중금속오염시한제저니자원화이용적주요인소.채용분재실험연구료침양세하중오염하도저니여감성로사화거목설배비후양분함량변화급대자화목숙(Medicago sativa L.)생장적영향.결과표명:둔화저니기질중유궤질화양분함량교고,능만족식물초기생장소수양분,단상대보비능력교저.장저니채용감성로매사둔화처리후,둔화저니기질상자화목숙생물량급주고균현저고우순저니처리,기중 SD4처리(하도저니∶연매로사∶거목설=1.0∶1.0∶0.5)중적식주장세최호.소유둔화저니기질상자화목숙지상부화근부중금속함량겁현저강저,이차근부중금속함량현저고우지상부함량.여순저니대조상비,둔화저니기질상자화목숙지상부화근부대중금속 Cd、Cu、Pb、Zn 적부집계수(BCF)화전이계수(TF)균소우1.0.
Heavy metal contamination is the major limitation for resource utilization of dredged sediment. Pot culture experiment was conducted to study the effects of dredged sediment stabilized by alkaline boiler slag on biomass, heavy metal uptake of Medicago sativa L. The experimental results showed that nutrient content of the stabilized sediment treatments, especially organic matter, available potassium and phosphorus, was high, which can meet the need of plant growth in initial, but the fertilizer retention capacity was lower. The biomass and plant height of Medicago sativa L. grown on stabilized sediment treatments were significantly higher than those of sediment alone treatment. In all stabilized sediment treatments, SD4 (sediment∶boiler slag∶wood sawdust=1.0∶1.0∶0.5) was most suitable for plant growth. When the dredged sediment was stabilized by boiler slag, the total content of heavy metal in Medicago sativa L was decreased. Heavy metal (Cd, Pb, Cu, Zn) concentrations in the root of plant (2.47-10.27, 7.26-12.17, 1.0-1.77, 29.81-64.06 mg·kg-1, respectively) were significantly higher than those in aerial parts of plant (0.78-3.31, 2.19-3.96, 0.75-1.73, 17.29-28.06 mg·kg-1, respectively). Moreover, the plant grown in all stabilized sediment treatments have low bioconcentration factor (BCF) and translocation factor (TF) (<1.0).
