Cornaglia, P.

Golluscio, R. A.

Granieri, L.

Oesterheld, M.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Silvopastoral Systems: Estimation of Understory Winter Grass Productivity by Remote Sensing L. Granieri Universidad de Buenos Aires, Argentina P. Cornaglia Universidad de Buenos Aires, Argentina R. A. Golluscio Universidad de Buenos Aires, Argentina M. Oesterheld Universidad de Buenos Aires, Argentina Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/5-1/25 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]665　 瞯Grasslands/Rangelands Resources and Ecology ——— Application of Information Technology in Monitoring and Managing Grasslands/Rangelands ResourcesSilvopastoral systems : estimation of understory winter grass productivity by remote sensingL . G ranieri , P . Cornaglia , R . Golluscio and M .Oesterheld .Facultad de A gronomí a , Universidad de Buenos A ires , A v . San Martí n 4453 (1417) , Buenos A ires , A rgentina . E‐mail :granieri＠ agro .uba .arKey words :NDVI ( Normalized Difference Vegetation Index) , rangeland , afforestation , basal cover , C３ plantsIntroduction Silvopastoral systems combine forest production with pastoral use of the understory .Most rangelands of theFlooding Pampas are dominated by C４ species ( Perelman et al . ２００１ ) , which determines a low quantity and quality of foragesupply during winter , a critical period for livestock production ( Paruelo et al . ２００１) . Clavijo et al . (２００５) found a lower liveherbaceous plant cover , and a lower absolute ground cover of C３ species but a higher proportion of C３ than C４ species in sitesafforested with poplars in comparison with the open grassland . This indicates that planting deciduous trees may constitute analternative for revert the dominance of warm season grasses and therefore increase winter productivity . Remote sensing allowsthe estimation of productivity of grasslands ( Oesterheld et al . １９９８ ; Purevdorj at al .１９９８ ; Paruelo et al . ２００１) . The objectiveof this work was to identify and interpret by remote sensing changes in the herbaceous winter productivity associated to theestablishment of deciduous trees .Materials and methods We obtained NDVI ( as an estimator of primary production) from satellite images , and then we comparedit with the field information obtained on the same grasslands . NDVI was compared in ９ Poplar afforestations ( F) with theirrespective paired plots with original grassland ( G ) . The plots were located at Castelli , province of Buenos Aires , Argentina(３６°０５′S ; ５７°４８′W) . Multispectral images of Landsat ５ TM satellite ( Path : ２２４‐Row : ０８５) , of ３０ meters of spatial resolutionwere used during the winter period . Satellite data were accompanied with basal cover and other parameters previously obtainedin the field (Clavijo et al . ２００５) . Data were analyzed using ANOVA model with repeated measures .Results and discussion The NDVI from F and G stands was not significantly different ( P ＝ ０ .９７) . However , F stands had largerNDVI per unit of basal cover of C３ than G stands ( P ＜ ０ .０７ , Figure １) . These results show that C３ species would be on a bettercondition in F plots than in G during winter period . T rees likely generate better micro environmental conditions for the growingof C３ species , by decreasing incident radiation and temperature and letting C３ species exploit radiation during winter when treesare leafless ( Clavijo et al . ２００５ ) .Figure 1 NDV I af f ected by basal cover o f C3 o f F and G stand in f our datesduring w inter period . Vertical lines show standard error .ANOVA 　 　 　 　 F values 　 　 　 　 p valuesF/G ４ .２４ ０ ．０７ 倡Date １６ .９ ＜ ０ ．００１ 倡倡F/G X Date １ .８ ０ ．１５７ nsConclusions The combination of remote sensing data and field measurements of plantcover of different functional types allowed us to demonstrate that the decrease ofabsolute plant cover of C３ grasses below afforestations did not translate into adecrease of winter ANPP , because the ANPP by unit of C３ grass cover increasedbelow afforestations .ReferencesClavijo ,M .P . ,M . Nordenstahl ,P . Gundel ,& E .G .Jobbágy . (２００５ ) . Poplar afforestation effects on grassland structureand composition in the Flooding Pampas . Rangeland Ecology and Management ５８ (５) :４７４‐４７９ .Oesterheld M . , C .M . Di Bella & H . Kerdiles . (１９９８) . Relation between NOAA‐AVHRR satellite data and stocking rate ofrangelands . Ecological A p p lications . ８ : ２０７‐２１２ .Paruelo J .M . ,E .G . Jobbágy ,& O .E . Sala . (２００１) . Current distributions of ecosystem functional types in temperate SouthAmerica . Ecosystems , ４ :６８３‐６９８ .Perelman ,S .B . ,León ,R .J .C . & Oesterheld ,M . (２００１ ) . Cross‐scale vegetation patterns of Flooding Pampa grasslands .Journal o f Ecology ８９ : ５６２‐５７７ .Purevdorj T , R .T .I . Tateishi & Y . Honda . １９９８ . Relationships between percent vegetation cover and vegetation indices .International Journal o f Remote Sensing . １９ : ３２１９‐３５３５ .4.5 I■ F □ GI ! a:: 3.5 ! w > ! 0 ! (.) M 2.5 ~ ~ > 2 2 C 1.5 Q z 0.5 10/08/04 11/09/04 07106/04 26/08/04 DATE 

Silvopastoral Systems: Estimation of Understory Winter Grass Productivity by Remote Sensing

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=2773&amp;context=igc

Silvopastoral Systems: Estimation of Understory Winter Grass Productivity by Remote Sensing

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