02085naa a2200253 a 450000100080000000500110000800800410001902400360006010000230009624501730011926000090029252012690030165000130157065000240158365000160160765300110162370000170163470000190165170000330167070000260170370000230172970000230175277300560177514100042022-11-22       2008    bl uuuu     u00u1 u    #d7 a10.1017/S0266467407004580.2DOI1 aVASCONCELOS, S. S.  aEffects of seasonality, litter removal and dry-season irrigation on litterfall quantity and quality in eastern Amazonian forest regrowth, Brazil.h[electronic resource]  c2008  aLitterfall quantity and quality may respond to alterations in resource availability expected with ongoing land-use and climate changes. Here, we quantify the effects of altered resource availability on non-woody litterfall quantity and quality (nitrogen and phosphorus concentrations) in easternAmazonian forest regrowth (Brazil) through twomulti-year experimentalmanipulations: (1) daily irrigation (5mmd?1) during the dry season; and (2) fortnightly litter removal. Consistentwith other tropical forest data litterfall exhibited seasonal patterns, increasingwith the onset of the dry season and declining with the onset of the rainy season. Irrigation did not affect litterfall mass and had little impact on nitrogen (N) or phosphorus (P) concentrations and return, except for decreasing litter P concentration at the end of two irrigation periods. Litter removal did not alter litterfall mass or P concentration, but progressively reduced litterfall N during the course of the experiment. Overall, these results suggest signi?cant resistance to altered resource availabilitywithin the bounds of our experimental treatments; our ?ndingsmay help to constrain carbon and nutrient cycling predictions for tropical forests in response to land-use and climate changes  aAmazonia  aFloresta Secundaria  aIrrigação  aBrasil1 aZARIN, D. J.1 aARAÚJO, M. M.1 aRANGEL-VASCONCELOS, L. G. T.1 aCARVALHO, C. J. R. de1 aSTAUDHAMMER, C. L.1 aOLIVEIRA, F. de A.  tJournal of Tropical Ecologygv. 24, p. 27-38, 2008.