
TY  - JOUR
A1  - McDowell, R. W. 
A1  - Drewry, J. J. 
A1  - Paton, R. J. 
A1  - Carey, P. L. 
A1  - Monaghan, R. M. 
A1  - Condron, L.  M. 
T1  - Influence of soil treading on sediment and phosphorus losses in overland flow
JF  - Soil Research
JO  - Soil Res.
Y1  - 2003
VL  - 41
IS  - 5
SP  - 949
EP  - 961
KW  - infiltration, particulate, hydrology, erosion, macropores, compaction.
UR  - https://doi.org/10.1071/SR02118 
N2  - This study investigated the effect of simulated cattle treading on soil infiltration rate (saturated hydraulic conductivity: Ksat) and macroporosity, and the consequent loss of sediment and phosphorus (P) via overland flow from a grassland and cultivated soil used for dairy farming in southern New Zealand. Treading decreased soil macroporosity and Ksat, and hence time to ponding, which increased the volume of overland flow. Mean suspended sediment concentration was greater in the cultivated treatments (0.076 g/L) compared with the grassland treatments (0.014 g/L). In the grassland soil, sediment and particulate P fractions in overland flow increased with treading due to increased soil disturbance and decreased protection from erosion by grass cover. In contrast, for the cultivated soil, sediment and P concentration and load decreased with increasing treading, due to greater ponding which decreased the erosive power of raindrop impact. Dissolved and particulate P fractions followed similar trends, although mean total P (mostly particulate P) was greater in cultivated treatments (1.07 mg/L) than the grassland treatments (0.64 mg/L). Relationships were generated between macroporosity and the loss of sediment and P, showing the wider application of macroporosity for environmental assessment than solely an agronomic measurement. 
ER  -

