01913naa a2200253 a 450000100080000000500110000800800410001902400420006010000190010224501360012126000090025752012150026665000100148165000130149165000100150465000130151465000160152765000090154365000090155265000090156170000190157070000230158977300470161218828202022-11-11       2010    bl uuuu     u00u1 u    #d7 a10.1111/j.1469-8137.2010.03299.x2DOI1 aLIMA, T. T. S.  aEffects of water and nutrient availability on fine root growth in eastern Amazonian forest regrowth, Brazil.h[electronic resource]  c2010  aFine root dynamics is widely recognized as an important biogeochemical process, but there are few data on ?ne root growth and its response to soil resource availability, especially for tropical forests. We evaluated the response of ?ne root dynamics to altered availability of soil water and nutrients in a 20-yr-old forest regrowth in eastern Amazonia. In one experiment the dry season reduction in soil moisture was alleviated by irrigation. In the other experiment, nutrient supply was reduced by litter removal. We used the ingrowth core technique to measure ?ne root mass growth, length growth, mortality and speci?c root length. Dry-season irrigation had no signi?cant effect on mass and length of live and dead roots, whereas litter removal reduced mass and length of live roots. For both irrigation and litter removal experiments, root growth was signi?cantly greater in the dry season than in the wet season. Increased root growth was associated with decreased soil water availability. However, root growth did not increase in response to nutrient reduction in litter removal plots. Overall, our results suggest that belowground allocation may differ according to the type of soil resource limitation.  aÁgua  aBiomassa  aChuva  aFloresta  aIrrigação  aRaiz  aSeca  aSolo1 aMIRANDA, I. S.1 aVASCONCELOS, S. S.  tNew Phytologistgv. 187, p. 622-630, 2010.