Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Chapter
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Chapter
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TY - CHAP
T1 - Phosphorus transport from diffuse agricultural sources
T2 - shallow subsurface pathways in grassland soils.
AU - Dils, R. M.
AU - Heathwaite, A. Louise
N1 - Phosphorus transport from diffuse agricultural sources: shallow subsurface pathways in grassland soils. 1 cites: http://scholar.google.com/scholar?num=100&hl=en&lr=&cites=12200071703265238286
PY - 1999
Y1 - 1999
N2 - Phosphorus (P) can be transferred from grassland soils along a number of surface and subsurface hydrological pathways. Currently, our understanding of subsurface transport mechanisms for P is limited. This research examines P transport in shallow subsurface pathways (matrix and macropore flow) under controlled laboratory conditions, and under true field conditions. Simulated rainfall experiments were performed on triplicate soil cores (0.01 m3) extracted in summer and winter from an intensively managed grazed grassland field. Matrix and macropore flow samples were collected in situ in this field. Despite the differences in sampling approach, the forms and amounts of P transported in matrix and macropore flow exhibited distinct similarities. In summer matrix flow, for example, total P (TP) concentrations rang ed from 47-185 ug l" 1 in the field and from 76-163 ug l" 1 in leachate from cores, with soluble P constituting 65% and 6 1% of TP, respectively. These findings further current understanding of field-scale P transport processes.
AB - Phosphorus (P) can be transferred from grassland soils along a number of surface and subsurface hydrological pathways. Currently, our understanding of subsurface transport mechanisms for P is limited. This research examines P transport in shallow subsurface pathways (matrix and macropore flow) under controlled laboratory conditions, and under true field conditions. Simulated rainfall experiments were performed on triplicate soil cores (0.01 m3) extracted in summer and winter from an intensively managed grazed grassland field. Matrix and macropore flow samples were collected in situ in this field. Despite the differences in sampling approach, the forms and amounts of P transported in matrix and macropore flow exhibited distinct similarities. In summer matrix flow, for example, total P (TP) concentrations rang ed from 47-185 ug l" 1 in the field and from 76-163 ug l" 1 in leachate from cores, with soluble P constituting 65% and 6 1% of TP, respectively. These findings further current understanding of field-scale P transport processes.
M3 - Chapter
SN - 1901502953
VL - 257
SP - 57
EP - 64
BT - Impact of land-use change on nutrient loads from diffuse sources
A2 - Heathwaite, Louise
PB - IAHS Publications
CY - Wallingford
ER -