Differences in throughfall and net precipitation between soybean and transitional tropical forest in the southern Amazon, Brazil


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dc.contributor.author Base, Frank
dc.contributor.author Elsenbeer, Helmut
dc.contributor.author Neill, Christopher
dc.contributor.author Krusche, Alex V.
dc.date.accessioned 2012-11-14T16:46:52Z
dc.date.available 2012-11-14T16:46:52Z
dc.date.issued 2012-06
dc.identifier.uri http://hdl.handle.net/1912/5545
dc.description Author Posting. © The Author(s), 2012. 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 159 (2012): 19-28, doi:10.1016/j.agee.2012.06.013. en_US
dc.description.abstract The expansion of soybean cultivation into the Amazon in Brazil has potential hydrological effects at local to regional scales. To determine the impacts of soybean agriculture on hydrology, a comparison of net precipitation (throughfall, stemflow) in undisturbed tropical forest and soybean fields on the southern edge of the Amazon Basin in the state of Mato Grosso is needed This study measured throughfall with troughs and stemflow with collar collectors during two rainy seasons. The results showed that in forest 91.6% of rainfall was collected as throughfall and 0.3% as stemflow, while in soybean fields with two-month old plants, 46.2% of rainfall was collected as throughfall and 9.0% as stemflow. Hence, interception of precipitation in soybean fields was far greater than in intact forests. Differences in throughfall, stemflow and net precipitation were found to be mainly associated with differences in plant structure and stem density in transitional forest and soybean cropland. Because rainfall interception in soybean fields is higher than previously believed and because both the area of cropland and the frequency of crop cycles (double cropping) are increasing rapidly, interception needs to be reconsidered in regional water balance models when consequences of land cover changes are analyzed in the Amazon soybean frontier region. Based on the continued expansion of soybean fields across the landscape and the finding that net precipitation is lower in soy agriculture, a reduction in water availability in the long term can be assumed. en_US
dc.description.sponsorship This study was supported by grants from NSF (DEB-0640661), the Fundaçao de Amparo à Pesquisa do Estado de São Paulo (FAPESP 08/58089-9) and the German Academic Exchange Service (DAAD 50122036). en_US
dc.format.mimetype application/pdf
dc.language.iso en en_US
dc.relation.uri http://dx.doi.org/10.1016/j.agee.2012.06.013
dc.subject Throughfall en_US
dc.subject Net precipitation en_US
dc.subject Stemflow en_US
dc.subject Soybean en_US
dc.subject Tropical forest en_US
dc.title Differences in throughfall and net precipitation between soybean and transitional tropical forest in the southern Amazon, Brazil en_US
dc.type Preprint en_US

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