文章摘要
何俊,王学东,陈世宝,刘彬,李宁,郑涵.不同污灌区两种小麦对土壤Pb吸收的主控因子与预测模型[J].农业环境科学学报,2016,35(10):1873-1880.
不同污灌区两种小麦对土壤Pb吸收的主控因子与预测模型
Key factors affecting the uptake of Pb by two kinds of wheat(Triticum aestivum Linn) and its predicted models in sewage irrigated soils
投稿时间:2016-04-12  
DOI:10.11654/jaes.2016-0491
中文关键词: 污灌土壤    累积特征  主控因子  预测模型
英文关键词: sewage irrigation soils  lead  accumulation  control factors  predicted model
基金项目:国家科技支撑计划项目(2015BAD05B03);国家自然科学基金项目(41271490,21077131)
作者单位E-mail
何俊 首都师范大学资源环境与旅游学院, 北京 100048  
王学东 首都师范大学资源环境与旅游学院, 北京 100048  
陈世宝 中国农业科学院农业资源与农业区划研究所, 农业部植物营养与肥料重点实验室, 北京 100081 chenshibao@caas.cn 
刘彬 中国农业科学院农业资源与农业区划研究所, 农业部植物营养与肥料重点实验室, 北京 100081  
李宁 中国农业科学院农业资源与农业区划研究所, 农业部植物营养与肥料重点实验室, 北京 100081  
郑涵 中国农业科学院农业资源与农业区划研究所, 农业部植物营养与肥料重点实验室, 北京 100081  
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中文摘要:
      采集我国北方5个典型污灌区0~20 cm土壤,添加250 mg·kg-1的Pb进行盆栽试验,测定不同污罐区土壤中两种不同敏感性小麦对Pb吸收、转化特征,同时利用离子色谱仪及WHAM 6.0化学模型对污灌区土壤溶液性质及自由Pb2+进行测定,探究污灌区土壤中小麦对Pb吸收的主控因子及其预测模型。结果表明,不同污灌区土壤中两种小麦对Pb的富集系数(BCF)及Pb的根-茎叶转运系数(TF)均有显著(P<0.05)差异,Pb敏感性品种轮选987根与茎叶的富集系数均明显高于耐Pb品种白麦126。山东棕壤中小麦对Pb的富集系数最大,而天津潮土的最小,最大相差255.9%;Pb污染土壤中小麦对Pb的富集系数及根-茎叶转运系数(TF)均大于相应的对照处理土壤。小麦根、茎叶中Pb含量与土壤溶液中自由Pb2+含量呈极显著正相关(P<0.01),线性拟合方程分别为:y=0.772x+54.805(R2=0.904),y=0.087x+12.980(R2=0.897);基于土壤主控因子的小麦Pb吸收模型表明,不同污罐区土壤小麦中Pb和土壤溶液自由Pb2+含量与土壤pH、OC含量呈负相关,而与土壤溶液Cl-、Na+离子含量呈正相关。除了受土壤主要因子影响外,土壤中Cl-、Na+含量升高将增加污灌土壤中Pb的环境风险。
英文摘要:
      Five typical kinds of sewage irrigated surface(0~20 cm) soils from North China were collected. The soils were added with 250 mg·kg-1 Pb with PbNO3 solution and a pot experiment was conducted to study the bioconcentration factors(BCF), root to shoot translocation coefficient(TF) of Pb by wheat characteristed with different sensitivity to Pb in different treated soils. To investigate the factors affecting the bioavailability of Pb in soils, the soil solution properties of sewage irrigation soil and the forms of Pb in solution(free Pb2+) were determined using ion chromatography and WHAM6.0 model. The results showed that significant differences(P<0.05) were found for the bioconcentration factors(BCF) of Pb uptake by two kind of wheat, the root to shoot translocation coefficient(TF) of Pb by the wheat cultivars in different sewage irrigated soils, in general, the bioconcentration factors(BCF) of Pb uptake by the wheat of Pb-sensitive cultivars LX-987 were larger than that for Pb-tolerance cultivar BM-126. The maximum BCFs of Pb in plant shoots was observed with treatment in brown soil from Shandong and minimum BCF with Fluvo-aquic soil from Tianjin, with a maximum variation of 225.9%, in general, the addition of Pb in soils increased the bioconcentration factors(BCFs) and root to shoot translocation coefficient(TFs) of Pb by the wheat cultivars as compared with that in control soils. Significant(P<0.05) positive correlation were observed between the free Pb2+ in soil solutions and the concentrations of Pb in the plant roots and shoots, a significant negative correlation(P<0.001) was observed between the Cd concentrations of plant roots and shoots, the linear equation were y=0.772x+54.805(R2=0.904) and y=0.087x+12.980(R2=0.897) respectively. Based on the main properties of the soils, predicted models of Pb bioavailability to wheat were developed, and the results indicated that negative correlation were found between the uptake of Pb by wheat/free Pb2+ in soils solution and the soil pH, OC, and CEC contents, however, in terms of Cl-, Na+ in soils solution, positive correlations were observed. It can be inferred that the increment of Cl-, Na+, content in field soils will significantly lead to increased environmental risk of Pb in the field soils besides of soil properties.
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