Biogeochemical processes and arsenic enrichment around rice roots in paddy soil: results from micro-focused X-ray spectroscopy

被引:68
作者
Frommer, J. [2 ]
Voegelin, A. [1 ]
Dittmar, J. [2 ]
Marcus, M. A. [3 ]
Kretzschmar, R. [2 ]
机构
[1] Swiss Fed Inst Aquat Sci & Technol, Eawag, CH-8600 Dubendorf, Switzerland
[2] ETH, Dept Environm Sci, Inst Biogeochem & Pollutant Dynam, Soil Chem Grp,CHN, CH-8092 Zurich, Switzerland
[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA
基金
瑞士国家科学基金会;
关键词
ORYZA-SATIVA L; IRON PLAQUE; TEMPORAL VARIABILITY; SPATIAL-DISTRIBUTION; INTERNAL AERATION; FERROUS IRON; PLANT-ROOTS; RHIZOSPHERE; ACCUMULATION; SPECIATION;
D O I
10.1111/j.1365-2389.2010.01328.x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The spatial distribution and speciation of iron (Fe), manganese (Mn) and arsenic (As) around rice roots grown in an As-affected paddy field in Bangladesh were investigated on soil sampled after rice harvest. Synchrotron micro-X-ray fluorescence spectrometry on soil thin sections revealed that roots influence soil Fe, Mn and As distribution up to 1 mm away from the root-soil interface. Around thick roots (diameter around 500 mu m), Mn was concentrated in discrete enrichments close to the root surface without associated As, whereas concentric Fe accumulations formed farther away and were closely correlated with As accumulations. Near thin roots (diameter < 100 mu m), in contrast, a pronounced enrichment of Fe and As next to the root surface and a lack of Mn enrichments was observed. X-ray absorption fine structure spectroscopy suggested that (i) accumulated Fe was mainly contained in a two-line ferrihydrite-like phase, (ii) associated As was mostly As(V) and (iii) Mn enrichments consisted of Mn(III/IV) oxyhydroxides. The distinct enrichment patterns can be related to the extent of O-2 release from primary and lateral rice roots and the thermodynamics and kinetics of Fe, Mn and As redox transformations. Our results suggest that in addition to Fe(III) plaque at the root surface, element accumulation and speciation in the surrounding rhizosphere soil must be taken into account when addressing the transfer of nutrients or contaminants into rice roots.
引用
收藏
页码:305 / 317
页数:13
相关论文
共 42 条
[2]   Oxygen distribution in wetland plant roots and permeability barriers to gas-exchange with the rhizosphere:: a microelectrode and modelling study with Phragmites australis [J].
Armstrong, W ;
Cousins, D ;
Armstrong, J ;
Turner, DW ;
Beckett, PM .
ANNALS OF BOTANY, 2000, 86 (03) :687-703
[3]   Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ [J].
Bargar, John R. ;
Fuller, Christopher C. ;
Marcus, Matthew A. ;
Brearley, Adrian J. ;
De la Rosa, M. Perez ;
Webb, Samuel M. ;
Caldwell, Wendel A. .
GEOCHIMICA ET COSMOCHIMICA ACTA, 2009, 73 (04) :889-910
[4]   Arsenic sequestration by ferric iron plaque on cattail roots [J].
Blute, NK ;
Brabander, DJ ;
Hemond, HF ;
Sutton, SR ;
Newville, MG ;
Rivers, ML .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2004, 38 (22) :6074-6077
[5]   Retention of arsenic and phosphorus in iron-rich concretions of Tagus salt marshes [J].
Caetano, M ;
Vale, C .
MARINE CHEMISTRY, 2002, 79 (3-4) :261-271
[6]   IRON COATINGS ON RICE ROOTS - MORPHOLOGY AND MODELS OF DEVELOPMENT [J].
CHEN, CC ;
DIXON, JB ;
TURNER, FT .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1980, 44 (05) :1113-1119
[7]   Long-distance transport of gases in plants: a perspective on internal aeration and radial oxygen loss from roots [J].
Colmer, TD .
PLANT CELL AND ENVIRONMENT, 2003, 26 (01) :17-36
[8]   Spatial distribution and temporal variability of arsenic in irrigated rice fields in Bangladesh. 2. Paddy soil [J].
Dittmar, Jessica ;
Voegelin, Andreas ;
Roberts, Linda C. ;
Hug, Stephan J. ;
Saha, Ganesh C. ;
Ali, M. Ashraf ;
Badruzzaman, A. Borhan M. ;
Kretzschmar, Ruben .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2007, 41 (17) :5967-5972
[9]   Arsenic transformations in the soil-rhizosphere-plant system: fundamentals and potential application to phytoremediation [J].
Fitz, WJ ;
Wenzel, WW .
JOURNAL OF BIOTECHNOLOGY, 2002, 99 (03) :259-278
[10]   PLANT-INDUCED CHANGES IN THE REDOX POTENTIALS OF RICE RHIZOSPHERES [J].
FLESSA, H ;
FISCHER, WR .
PLANT AND SOIL, 1992, 143 (01) :55-60