Showing papers by "Giselda Durigan published in 2016"
230 citations
National Institute for Space Research1, Institut national de la recherche agronomique2, University of Antwerp3, University of Leeds4, University of Hohenheim5, Royal Museum for Central Africa6, National Institute of Amazonian Research7, Empresa Brasileira de Pesquisa Agropecuária8, University of Tasmania9, University of Erlangen-Nuremberg10, Wageningen University and Research Centre11, Universidade Federal do Acre12, Spanish National Research Council13, University of São Paulo14, Federal University of Paraná15, Universidade Federal de Juiz de Fora16, Centre national de la recherche scientifique17, University of Zambia18, University of Missouri–St. Louis19, Universidade Federal de Viçosa20, Stellenbosch University21, Escola Superior de Agricultura Luiz de Queiroz22, Universidade Federal de Santa Maria23, University of Brasília24, World Agroforestry Centre25, Charles Darwin University26, Mount Holyoke College27, University of Illinois at Urbana–Champaign28, Stanford University29, University of Göttingen30, Universidade do Estado de Santa Catarina31, Malaysian Palm Oil Board32, Universidade Federal de Minas Gerais33, California State University, Monterey Bay34, Universidade Federal de Sergipe35, University of Helsinki36, University of Oxford37, United States Forest Service38, Florida International University39, Kyoto University40, Institut Français41, National Scientific and Technical Research Council42, Sao Paulo State University43, University of Edinburgh44, Oregon State University45, Brazilian Institute of Environment and Renewable Natural Resources46, Federal University of Roraima47, University of Aberdeen48, Universidade Federal do Amapá49, Universidad Autónoma Gabriel René Moreno50, State University of Campinas51, University of Exeter52
TL;DR: In this paper, the seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem.
Abstract: The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associated canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is < 2000 mm yr(-1) (water-limited forests) and to radiation otherwise (light-limited forests). On the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration, respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. First-order control by precipitation likely indicates a decrease in tropical forest productivity in a drier climate in water-limited forest, and in current light-limited forest with future rainfall < 2000 mm yr(-1).
109 citations
TL;DR: Assessment of changes in tree density and basal area and estimated changes in rain interception by the canopies across a 5-year period over a biomass gradient in Cerrado vegetation protected from fire found a robust relationship between increases in tree biomass and rainfall.
Abstract: Woody encroachment due to changes in climate or in the disturbance regimes (fire and herbivory) has been observed throughout the savannah biome over the last century with ecological, hydrological a...
83 citations
TL;DR: It is indicated that alternating temperatures and light incidence are key factors for germination of species of Poaceae and the maintenance of these environmental factors depends on appropriate management interventions, such as fire management and the control of biological invasion.
Abstract: Few studies address the ecology of herbs of Cerrado grasslands, which are ecosystems where the long dry season, high temperatures, insolation, fire and invasive grasses greatly influencing germination and the establishment of plants. We assessed germination of 13 species of Poaceae from Cerrado grasslands under nursery conditions or in germination chambers, the latter with i) recently collected seeds and seeds after six months storage, ii) under constant and alternating temperatures, and iii) in the presence and absence of light. Germinability, mean germination time (MGT) and required light were quantified to elucidate factors involved in successful germination. Germinability was low for most grasses, probably because of low seed viability. For most species, germinability and MGT were not altered by seed storage. Germination percentages were higher at alternating temperatures and in the presence of light, factors that are more similar to natural environmental situations compared with constant temperature or the absence of light. Our findings indicate that alternating temperatures and light incidence are key factors for germination of species of Poaceae. The maintenance of these environmental factors, which are crucial for the conservation of Cerrado grasslands, depends on appropriate management interventions, such as fire management and the control of biological invasion.
29 citations
01 Jun 2016
TL;DR: Resiliencia, custos e metas (recobertura, exploracao economica ou biodiversidade) conduzem a diferentes decisoes entre tecnicas para a restauracao do Cerrado.
Abstract: Restaurar o Cerrado e um desafio para a ciencia e a pratica, que depende de experimentacao. Comparamos, pela eficacia ecologica e custos, a semeadura direta em linhas ou a lanco, plantio de mudas e regeneracao natural assistida ou passiva, para restaurar a vegetacao de Cerrado em pastos abandonados em Canarana, MT. Apos 22 meses, registramos 112 especies lenhosas na area experimental como um todo, 16 das quais foram plantadas, evidenciando alta resiliencia do Cerrado em pastos abandonados. A riqueza nao diferiu entre tratamentos, mas a semeadura direta resultou em alta dominância de uma unica especie e baixa diversidade. Por outro lado, a semeadura direta em linhas proporcionou densidade superior aos outros tratamentos. O plantio de mudas, que apresentou custos mais elevados, nao resultou em densidade ou riqueza superiores aos outros tratamentos. Resiliencia, custos e metas (recobertura, exploracao economica ou biodiversidade) conduzem a diferentes decisoes entre tecnicas para a restauracao do Cerrado.
20 citations
6 citations