Acknowledgments

This work was supported by the Fundagao de Amparo รก Pesquisa do Estado de Sao Paulo (FAPESP-99/07103-0), Coorde-nagao de Aperfeigoeamento de Pessoal de Nivel Superior (CAPES-1240/01-3), National Science Foundation (IBN-9987996), Consortium for Agricultural Mitigation of Greenhouse Gases (CASMGS), Ecosystem Center (Woods Hole Oceanographic Institution, Woods Hole, MA), and Global Environment Facility (GFL/2740-02-4381). We are grateful to Joao Arantes Jr., who kindly permitted us to work at Nova Vida Ranch and assisted with logistical support.

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