Soil moisture effects on uptake of metals by Thlaspi, Alyssum, and Berkheya

被引:55
作者
J. Scott Angle
Alan J. M. Baker
Steven N. Whiting
Rufus L. Chaney
机构
[1] Dept. Nat. Rsrc. Sci. Landscape A., University of Maryland, College Park
[2] School of Botany, University of Melbourne, Parkville
[3] US Department of Agriculture, Agricultural Research Service, Beltsville
关键词
Hyperaccumulator plants; Moisture capacity; Phytoextraction; Phytoremediation;
D O I
10.1023/A:1026137624250
中图分类号
学科分类号
摘要
Most commonly used hyperaccumulator plants for phytoextraction of metals evolved on soils where moisture is limited throughout much of the year. As these plant species are commercialized for use, they are frequently moved from the point of evolution to locations where environmental conditions may be significantly different. Greatest among these potential differences is soil moisture. The objective of this study was therefore to determine whether these plants could grow in soils with much higher soil moisture and whether they would continue to hyperaccumulate metals as soils approach saturation. We examined extractable soil metal concentrations, plant growth, and metal accumulation for the Ni hyperaccumulators, Alyssum murale and Berkheya coddii and the Zn hyperaccumulators Thlaspi caerulescens cultivars AB300 and AB336. Non-hyperaccumulating control species for each were also examined. In general, extractable soil concentrations of Ni decreased with increasing soil moisture content. Few significant effects related to Zn extractability were observed for any of the soil moisture treatments. The biomass of all tested species was generally greater at higher soil moisture and inhibited at low soil moisture. Further, plants accumulated large amounts of metals from soil at higher soil moisture. Highest foliar concentrations of Zn or Ni were found at the two highest WHCs of 80 and 100%. These results show that hyperaccumulators grow well under conditions of high soil moisture content and that they continue to hyperaccumulate metals. Thus, growing Thlaspi, Alyssum, and Berkheya for commercial phytoextraction under nonnative conditions is appropriate and suggests that this technology may be applied to a wide and diverse range of soil types, climatic conditions, and irrigation regimes.
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页码:325 / 332
页数:7
相关论文
共 28 条
[1]  
Angle J.S., Chaney R.L., Baker A.J.M., Li Y.M., Reeves R.D., Volk V., Rosenberg R., Brewer E., Burke S., Nelkin J., Developing commercial phytoextraction technologies: Practical considerations, S. African J. Soil Sci., 97, pp. 619-623, (2001)
[2]  
Baker A.J.M., Brooks R.R., Terrestrial higher plants which hyperaccumulate metal elements. A review of their distribution, ecology, and phytochemistry, Biorecovery, 1, pp. 81-126, (1989)
[3]  
Baker A.J.M., Walker P.L., Ecophysiology of metal uptake by tolerant plants, Heavy Metal Tolerance in Plants: Evolutionary Aspects, pp. 155-177, (1989)
[4]  
Baker A.J.M., Whiting S.N., In Search of the Holy Grail - A Further Step in the Understanding of Metal Hyperaccumulation, New Phytol., 155, pp. 1-4, (2002)
[5]  
Baker A.J.M., Reeves R.D., McGrath S.P., In situ decontamination of heavy metal polluted soils using crops of metal-accumulating plants - A feasibility study, In Situ Bioreclamation, (1991)
[6]  
Baker A.J.M., McGrath S.P., Reeves R.D., Smith J.A.C., Metal hyperaccumulator plants: A review of the ecology and physiology of a biological resource for phytoremediation of metal-polluted soils, Phytoremediation of Contaminated Soil and Water, pp. 85-107, (2000)
[7]  
Brown S.L., Chaney R.L., Angle J.S., Baker A.J.M., Zinc and cadmium uptake by Thlaspi caerulescens and Silene cucubalis in relation to soil metals and soil pH, J. Environ. Qual., 23, pp. 1151-1157, (1994)
[8]  
Brown S.L., Chaney R.L., Angle J.S., Baker A.J.M., Zn and Cd uptake of Thlaspi caerulescens grown in nutrient solution, Soil Sci. Soc. Am. J., 59, pp. 125-133, (1995)
[9]  
Chaney R.L., Crop and Food Chain Effects of Toxic Elements in Sludges, (1983)
[10]  
Chesterfield E.A., A Study of the Plant Communities in the Catchment of the Glenmaggie Reservoir, (1978)