Soil hydraulic response to land-use change associated with the recent soybean expansion at the Amazon agricultural frontier
Krusche, Alex V.
MetadataShow full item record
KeywordLand-cover change; Tropical forest; Pasture; Infiltrability; Saturated hydraulic conductivity, Ksat; Hydrological flowpaths
Clearing for large-scale soy production and the displacement of cattle-breeding by soybeans are major features of land-use change in the lowland Amazon that can alter hydrologic properties of soils and the runoff generation over large areas. We measured infiltrability and saturated hydraulic conductivity (Ksat) under natural forest, pasture, and soybeans on Oxisols in a region of rapid soybean expansion in Mato Grosso, Brazil. The forest-pasture conversion reduced infiltrability from 1258 to 100 mm/h and Ksat at all depths. The pasture-soy conversion increased infiltrability from 100 to 469 mm/h (attributed to shallow disking), did not affect Ksat at 12.5 cm, but decreased Ksat at 30 cm from 122 to 80 mm/h, suggesting that soybean cultivation enhances subsoil compaction. Permeability decreased markedly with depth under forest, did not change under pasture, and averaged out at one fourth the forest value under soybeans with a similar pattern of anisotropy. Comparisons of permeability with rainfall intensities indicated that land-use change did not alter the predominantly vertical water movement within the soil. We conclude that this landscape is well buffered against land-use changes regarding near-surface hydrology, even though short-lived ponding and perched water tables may occur locally during high-intensity rainfall on pastures and under soybeans.
Author Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Agriculture, Ecosystems & Environment 144 (2011): 281–289, doi:10.1016/j.agee.2011.08.016.
Suggested CitationPreprint: Scheffler, Raphael, Neill, Christopher, Krusche, Alex V., Elsenbeer, Helmut, "Soil hydraulic response to land-use change associated with the recent soybean expansion at the Amazon agricultural frontier", 2011-08, https://doi.org/10.1016/j.agee.2011.08.016, https://hdl.handle.net/1912/5103
Showing items related by title, author, creator and subject.
Modelled hydraulic redistribution by sunflower (Helianthus annuus L.) matches observed data only after including night-time transpiration Neumann, Rebecca B.; Cardon, Zoe G.; Teshera-Levye, Jennifer; Rockwell, Fulton E.; Zwieniecki, Maciej A.; Holbrook, N. Michele (2013-09)The movement of water from moist to dry soil layers through the root systems of plants, referred to as hydraulic redistribution (HR), occurs throughout the world and is thought to influence carbon and water budgets and ...
Geyer, W. Rockwell; Ralston, David K.; Holleman, Rusty C. (John Wiley & Sons, 2017-06-12)Estuarine mixing is often intensified in regions where topographic forcing leads to hydraulic transitions. Observations in the salt-wedge estuary of the Connecticut River indicate that intense mixing occurs during the ebb ...
Diel plant water use and competitive soil cation exchange interact to enhance NH4+ and K+ availability in the rhizosphere Espeleta, Javier F.; Cardon, Zoe G.; Mayer, K. Ulrich; Neumann, Rebecca B. (Springer, 2016-11-12)Hydro-biogeochemical processes in the rhizosphere regulate nutrient and water availability, and thus ecosystem productivity. We hypothesized that two such processes often neglected in rhizosphere models — diel plant water ...