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| 1 | Sharp differentiation on the performance of plant functional groups across natural edges显示文摘Aims Gallery forests within grasslands have natural edges with open envi-ronments and offer a unique opportunity to examine how species performances vary across environmental gradients.Here,we asked if demographic rates of tree functional groups varied along the edge,if we could explain differences in plant strategies and performance through functional traits and which traits increase growth and sur-vival in natural edges.Methods We examine mortality and recruitment within the first 10 m of nat-ural edges of eight gallery forests using demographic data from five annual inventories.We defined a priori plant strategies using tree functional groups:light demanding,pioneer and shade tolerant.Important Findings The shade-tolerant group had the lowest mortality rates and basal area(BA)loss,while pioneer and light-demanding species had similar behavior for these rates.The survival and growth of functional groups were affected differently by the distance from the edge.The pioneer group survived more near the edge,while light-demanding and shade-tolerant groups toward the forest interior.All groups had higher growth in the grassland.Those differences could be explained by functional traits since most species have an acquisition strategy:higher specific leaf area and growth,lower leaf dry matter con-tent,lighter stem density,deeper crowns and less slender stems.Acquisitive traits enhanced growth.However,mortality selected both strategies,but in distinct edge’s zones.Our study showed that the high diversity found in natural edges can be explained by a niche and functional perspective,where differences in functional traits lead to differential performance along the environmental gradient. | Evelyn da Fonseca Alecrim Bragion Gabriela Aparecida Oliveira Coelho Flávia Freire de Siqueira Maria Uriarte Eduardo van den Berg | 2019 | Journal of Plant Ecology2019，12，1： | 0 |
| 2 | The influence of disturbance on driving carbon stocks and tree dynamics of riparian forests in Cerrado显示文摘Aims Riparian forests in the Brazilian Cerrado,also known as gallery forests,are very heterogeneous in structure,species composition and ecological features due to strong and abrupt variations of soil,hydrological and topographic properties.However,what are the variables driving forest carbon stock and productivity,mortality and recruitment in disturbed gallery forests?Methods We used 36 permanent plots data from a gallery forest in the Brazilian Cerrado.We investigated how tree community dynam-ics vary in a gallery forest on two contrasting disturbance levels-logged and non-logged-across a topographic gradient intrinsically related to differences in moisture conditions,edge effects,as well as soil fertility and texture.Important Findings Soil variables were reduced into principal components and we used structural equation modelling to disentangle covarying variables.We also included carbon stocks as a determinant variable of dynamics rates.Logged forest had 50%higher productivity than non-logged forest and streamside forest had aboveground carbon stocks 70%higher than the forest edge.Both logging and natural disturbance drove variation in the carbon stocks which contributed to shaping productivity and recruitment rates.Distance from the river also drove mortality and carbon stock rates.Areas with high-carbon stocks favoured higher competition and lessened produc-tivity and recruitment rates.Although soil fertility and texture are considered crucial components shaping forest dynamics,there was no clear influence of those variables on the present forest,probably because the strong effects of soil moisture,forest edge and distur-bance disrupted the correlation between soil and forest dynamics. | Matheus Henrique Nunes Marcela de Castro Nunes Santos Terra Izabela Regina Cardoso de Oliveira Eduardo van den Berg | 2018 | Journal of Plant Ecology2018，11，3： | 0 |
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