农业环境科学学报2016，Vol.35Issue(10)：1873-1880,8.DOI:10.11654/jaes.2016-0491
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 mod-els in sewage irrigated soils
摘要
Abstract
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 bioconcentra-tion 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 Shan-dong and minimum BCF with Fluvo-aquic soil from Tianjin, with a maximum variation of 225.9%, in general, the addition of Pb in soils in-creased 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.关键词
污灌土壤/铅/累积特征/主控因子/预测模型Key words
sewage irrigation soils/lead/accumulation/control factors/predicted model分类
资源环境引用本文复制引用
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):1873-1880,8.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 （）
