TY  - JOUR
A1  - Neill, Christopher
A1  - Coe, Michael T.
A1  - Riskin, Shelby H.
A1  - Krusche, Alex V.
A1  - Elsenbeer, Helmut
A1  - Macedo, Marcia N.
A1  - McHorney, Richard
A1  - Lefebvre, Paul
A1  - Davidson, Eric A.
A1  - Scheffler, Raphael
A1  - Figueira, Adelaine Michela e Silva
A1  - Porder, Stephen
A1  - Deegan, Linda A.
T1  - Watershed responses to Amazon soya bean cropland expansion and intensification
JF  - Philosophical transactions of the Royal Society of London : B, Biological sciences
N2  - The expansion and intensification of soya bean agriculture in southeastern Amazonia can alter watershed hydrology and biogeochemistry by changing the land cover, water balance and nutrient inputs. Several new insights on the responses of watershed hydrology and biogeochemistry to deforestation in Mato Grosso have emerged from recent intensive field campaigns in this region. Because of reduced evapotranspiration, total water export increases threefold to fourfold in soya bean watersheds compared with forest. However, the deep and highly permeable soils on the broad plateaus on which much of the soya bean cultivation has expanded buffer small soya bean watersheds against increased stormflows. Concentrations of nitrate and phosphate do not differ between forest or soya bean watersheds because fixation of phosphorus fertilizer by iron and aluminium oxides and anion exchange of nitrate in deep soils restrict nutrient movement. Despite resistance to biogeochemical change, streams in soya bean watersheds have higher temperatures caused by impoundments and reduction of bordering riparian forest. In larger rivers, increased water flow, current velocities and sediment flux following deforestation can reshape stream morphology, suggesting that cumulative impacts of deforestation in small watersheds will occur at larger scales.
KW  - soya beans
KW  - watersheds
KW  - nitrogen
KW  - phosphorus
KW  - soil
Y1  - 2013
U6  - https://doi.org/10.1098/rstb.2012.0425
SN  - 0962-8436
SN  - 1471-2970
VL  - 368
IS  - 1619
PB  - Royal Society
CY  - London
ER  -