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초록· 키워드
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A detailed understanding and appreciation of the important mechanisms operating at the soil:root interface, commonly identified as the rhizosphere, is critical for evaluating the potential for particular plant species to be successfully used as part of a phytoremediation technique. For specific plants, mechanisms may exist to overcome the inherit limitation of the phytoremediation technique when poorly mobile soil metals are of interest. In the present study, the influence of root exudates on the rhizosphere chemistry of soil and consequential metal uptake were investigated following culture of vetiver grass (Vetiveria zizanioides), recognized as a promising plant for land stabilization, in three different long-term contaminated soils and one non-contaminated control soil.
The soil solution pH increased (0.3-1.1 units) following vetiver grass culture and dissolved organic carbon (DOC) also significantly increased in all soils with the highest increase in PP02 (23 to 173 mg L-1). Chemical changes are contributed to root exudation by vetiver grass when exposed to high concentration of heavy metals. Chemical changes, consequently, influenced metal (Cd, Cu, Pb, and Zn) solubility and speciation in the rhizosphere. The highest solubility was observed for soil Ko01 (eg. 2091 and 318 μg L-1 for Cd and Pb, respectively). Initial heavy metal solubility in soils varied with soil and either increased or decreased following vetiver grass culture depending on the soil type.
An increase in pH following plant culture generally resulted in a decrease in metal solubility, while elevated DOC due to root exudation resulted in an increase in metal solubility via the formation of metal-DOC complexes. Donnan speciation demonstrated a significant decrease in free Cd and Zn in the rhizosphere and the concentration of Cd, Pb, and Zn in vetiver grass shoot was highly correlated with soluble concentration rather than total soil metal concentration.
The soil solution pH increased (0.3-1.1 units) following vetiver grass culture and dissolved organic carbon (DOC) also significantly increased in all soils with the highest increase in PP02 (23 to 173 mg L-1). Chemical changes are contributed to root exudation by vetiver grass when exposed to high concentration of heavy metals. Chemical changes, consequently, influenced metal (Cd, Cu, Pb, and Zn) solubility and speciation in the rhizosphere. The highest solubility was observed for soil Ko01 (eg. 2091 and 318 μg L-1 for Cd and Pb, respectively). Initial heavy metal solubility in soils varied with soil and either increased or decreased following vetiver grass culture depending on the soil type.
An increase in pH following plant culture generally resulted in a decrease in metal solubility, while elevated DOC due to root exudation resulted in an increase in metal solubility via the formation of metal-DOC complexes. Donnan speciation demonstrated a significant decrease in free Cd and Zn in the rhizosphere and the concentration of Cd, Pb, and Zn in vetiver grass shoot was highly correlated with soluble concentration rather than total soil metal concentration.
목차
Introduction
Materials and Methods
Results and Discussion
Conclusion
References
참고문헌 (49)
참고문헌 신청
Almas, A. R. , 2000 , Solubility and lability of cadmium and zinc in two soils treated with organic matter , Soil Science 165 : 250 ~ 259
Asao, T. , 2003 , Autotoxicity of root exudates from taro , Scientia Horticulturae 97 (3-4) : 389 ~ 396
Ashley, P. M. , 1999 , Arsenic contamination at the Mole River mine, northern New South Wales , Austr. J. Earth Sci 46 : 861 ~ 874
Awad, F. , 1994 , Effect of root exudates on mobilization in the rhizosphere and uptake of iron by wheat plants , Plant and Soil 165 : 213 ~ 218
Brooks, R.,R. , 1997 , Detection of nickeliferous rocks by analysis of herbarium species of indicator plants , J. Geochem. Explor 7 : 49 ~ 57
Asao, T. , 2003 , Autotoxicity of root exudates from taro , Scientia Horticulturae 97 (3-4) : 389 ~ 396
Ashley, P. M. , 1999 , Arsenic contamination at the Mole River mine, northern New South Wales , Austr. J. Earth Sci 46 : 861 ~ 874
Awad, F. , 1994 , Effect of root exudates on mobilization in the rhizosphere and uptake of iron by wheat plants , Plant and Soil 165 : 213 ~ 218
Brooks, R.,R. , 1997 , Detection of nickeliferous rocks by analysis of herbarium species of indicator plants , J. Geochem. Explor 7 : 49 ~ 57
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UCI(KEPA) : I410-ECN-0101-2014-521-000806734