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Grassland root demography responses to multiple climate change drivers depend on root morphology 总被引:1,自引:0,他引:1
R. Pilon C. Picon-Cochard J. M. G. Bloor S. Revaillot E. Kuhn R. Falcimagne P. Balandier J.-F. Soussana 《Plant and Soil》2013,364(1-2):395-408
Aims
We examine how root system demography and morphology are affected by air warming and multiple, simultaneous climate change drivers.Methods
Using minirhizotrons, we studied root growth, morphology, median longevity, risk of mortality and standing root pool in the upper soil horizon of a temperate grassland ecosystem for 3 years. Grassland monoliths were subjected to four climate treatments in a replicated additive design: control (C); elevated temperature (T); combined T and summer precipitation reduction (TD); combined TD and elevated atmospheric CO2 (TDCO2).Results
Air warming (C vs T) and the combined climate change treatment (C vs TDCO2) had a positive effect on root growth rate and standing root pool. However, root responses to climate treatment varied depending on diameter size class. For fine roots (≤ 0.1 mm), new root length and mortality increased under warming but decreased in response to elevated CO2 (TD vs TDCO2); for coarse roots (> 0.2 mm), length and mortality increased under both elevated CO2 and combined climate change drivers.Conclusions
Our data suggest that the standing roots pool in our grassland system may increase under future climatic conditions. Contrasted behaviour of fine and coarse roots may correspond to differential root activity of these extreme diameter classes in future climate. 相似文献2.
Picon-Cochard Catherine Pilon Rémi Revaillot Sandrine Jestin Michel Dawson Lorna 《Plant and Soil》2009,317(1-2):309-320
Plant and Soil - We tested the potential of near-infrared reflectance spectroscopy (NIRS) to predict the percentage of dead versus living roots of five grass species grown in monocultures under... 相似文献
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