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| Key factors affecting the uptake of Pb by two kinds of wheat(Triticum aestivum Linn) and its predicted models in sewage irrigated soils |
| Received:April 12, 2016 |
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| KeyWord:sewage irrigation soils;lead;accumulation;control factors;predicted model |
| Author Name | Affiliation | E-mail | | HE Jun | College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China | | | WANG Xue-dong | College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China | | | CHEN Shi-bao | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | chenshibao@caas.cn | | LIU Bin | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LI Ning | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHENG Han | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | |
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| 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 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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