02971naa a2200385 a 450000100080000000500110000800800410001902200140006002400260007410000180010024500970011826000090021530000070022449000070023150000900023852018320032865000120216065000150217265000240218765000150221165000180222665300390224465300390228365300180232265300310234065300340237165300190240570000170242470000140244170000140245570000150246970000160248470000190250077300660251910502012019-02-11       2010    bl uuuu     u00u1 u    #d  a1551-50287 a10.2111/08-055.12DOI1 aPARUELO, J.M.  aCarbon stocks and fluxes in rangelands of the Río de la plata basin.h[electronic resource]  c2010  a63  v63  aArticle history: Manuscript received 17 March 2008; manuscript accepted 3 April 2009.  aABSTRACT: Grasslands are one of the most modified biomes on Earth. Land use changes had a large impact on carbon (C) stocks of grasslands. Understanding the impact of land use/land cover changes on C stocks and fluxes is critical to evaluate the potential of rangeland ecosystem as C sinks. In this article we analyze C stocks and fluxes across the environmental gradients of one of the most extensive temperate rangeland areas: the Rio de la Plata Grasslands (RPG) in South America. The analysis summarizes information provided by field studies, remote sensing estimates, and modeling exercises. Average estimates of aboveground net primary production ( ANPP) ranged from 240 to 316 gC · m~2 · yr"1. Estimates of belowgro und NPP(BNPP) were more variable than ANPP and ranged from 264 to 568 g C · m~2 · yr"1. Total Carbon ranged from 5 004 to 15 008 g C · m~2. Plant biomass contribution to Total Carbon averaged 13 % and varied from 9.5% to 27% among sites. The largest plant C stock corresponded to belowground biomass. Aboveground green biomass represented less than 7% of the plant C. Soil organic carbon (SOC) was concentrated in the slow and passive compartments of the organic matter. Active soil pool represented only 6.7% of the SOC. The understanding of C dynamics and stocks in the RPG grasslands is still partial and incomplete. Field estimates of ANPP and BNPP are scarce, and they are not based on a common measurement protocol. Remotely sensed techniques have the potential to generate a coherent and spatially explicit database on ANPP. However, more work is needed to improve estimates of the spatial and temporal variability of radiation use efficiency. The absence of a flux tower network restricts the ability to track seasonal changes in C uptake and to understand fine-scale controls of C dynamics.  aCARBONO  aMEDICIONES  aMODELOS MATEMATICOS  aPASTIZALES  aTELEDETECCION  aABOVEGROUND NET PRIMARY PRODUCTION  aBELOWGROUND NET PRIMARY PRODUCTION  aCENTURY MODEL  aCUENCA DEL RIO DE LA PLATA  aLAND USE - LAND COVER CHANGES  aREMOTE SENSING1 aPIÑEIRO, G.1 aBALDI, G.1 aBAEZA, S.1 aLEZAMA, F.1 aALTESOR, A.1 aOESTERHELD, M.  tRangeland Ecology & Management, 2010gv. 63, no. 1 p. 94-108.