Differences in throughfall and net precipitation between soybean and transitional tropical forest in the southern Amazon, Brazil
Krusche, Alex V.
MetadataShow full item record
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.
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.
Showing items related by title, author, creator and subject.
Response of plant nutrient stoichiometry to fertilization varied with plant tissues in a tropical forest Mo, Qifeng; Zou, Bi; Li, Yingwen; Chen, Yao; Zhang, Weixin; Mao, Rong; Ding, Yongzhen; Wang, Jun; Lu, Xiankai; Li, Xiaobo; Tang, Jianwu; Li, Zhian; Wang, Faming (Nature Publishing Group, 2015-09-29)Plant N:P ratios are widely used as indices of nutrient limitation in terrestrial ecosystems, but the response of these metrics in different plant tissues to altered N and P availability and their interactions remains ...
Nutrient limitation of woody debris decomposition in a tropical forest : contrasting effects of N and P addition Chen, Yao; Sayer, Emma J.; Li, Zhian; Mo, Qifeng; Li, Yingwen; Ding, Yongzhen; Wang, Jun; Lu, Xiankai; Tang, Jianwu; Wang, Faming (2015-04)Tropical forests represent a major terrestrial store of carbon (C), a large proportion of which is contained in the soil and decaying organic matter. Woody debris plays a key role in forest C dynamics because it contains ...
Long-term CO2 enrichment of a forest ecosystem : implications for forest regeneration and succession Mohan, Jacqueline E.; Clark, James S.; Schlesinger, William H. (Ecological Society of America, 2007-06)The composition and successional status of a forest affect carbon storage and net ecosystem productivity, yet it remains unclear whether elevated atmospheric carbon dioxide (CO2) will impact rates and trajectories of forest ...