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| Web URL(s): | https://dl.sciencesocieties.org/publications/jeq/pdfs/24/3/JEQ0240030432
Last checked: 12/12/2016
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| Publication Type:
| Refereed |
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| Author(s): | Li, Yimin;
Ghodrati, Masoud |
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| Author Affiliation: | Sciences International, Inc., Alexandria, VA 22314; Dep. of Environmental Science, Policy, and Management, Univ. of California, Berkeley, CA 94720 |
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| Title: | Transport of nitrate in soils as affected by earthworm activities |
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| Source: | Journal of Environmental Quality. Vol. 24, No. 3, May/June 1995, p. 432-438. |
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| Publishing Information: | Madison, Wisconsin: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America |
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| # of Pages: | 7 |
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| Keywords: | TIC Keywords: Earthworms; Nitrates; Soils; Models; Aggregates; Earthworm channels; Infiltration; Water transfer
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| Abstract/Contents: | "Earthworm (Lumbricus sp.) holes have long been recognized as an important conduit for water and solute transport in field soils. In this study we investigated preferential movement of NO(3) through artificially induced earthworm holes and compared three commonly used solute transport models with respect to their ability to describe NO(3) transport through the earthworm macropore system. Earthworm holes were created by introducing earthworms into uniformly packed soil columns of 20-cm i.d. and 30- or 60-cm long. After 8 wk of incubation, the columns were leached at a range of fluxes and NO(3) breakthrough curves (BTCs) were determined. The columns also were traced with dyes to visualize the spatial distribution of the earthworm holes. The results showed that the earthworms completely altered the uniformity of the packed soil cores. The average saturated hydraulic conductivities of the earthworm hole columns [K(sm)] increased 17.9- to 22.3-folds as compared with the control columns. Significant preferential movement of NO(3) occurred in these columns even at relative fluxes as low as 0.014 [K(sm)]. A nonlinear least squares program, CXTFIT, was used to fit three solute transport models to all BTCs. The physical nonequilibrium model (MIM) fitted the experimental data better than the convection-dispersion equation (CDE) and the stochastic model (SM), while none of them was adequate to describe the data well." |
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| Language: | English |
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| References: | 43 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Li, Y., and M. Ghodrati. 1995. Transport of nitrate in soils as affected by earthworm activities. J. Environ. Qual. 24(3):p. 432-438. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/jeq/pdfs/24/3/JEQ0240030432
Last checked: 12/12/2016
Requires: PDF Reader
Notes: Item is within a limited-access website |
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MSU catalog number: S 900 .J6 |
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