Livestock grazing systems - Biblioteca Digital do IPB
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Liv es tock grazing sys tems :.ll1d bnd use: the case of n o rthern Portugal b efo re the EU agrarIan policy J. F. de C:ls tro 1, [\1.[\1. Ferreir3 de Castro I :1I1d.-\. Gomez Sal :! IEscolJ Superior Ag rJ ri~ , Campus de Sr' Apoioni ;:L 5300 BrJgan cJ. POl1ugJI 2Ecologia. Umversidad de Alc3b. Campus Universitario . 23371 ,~lc313 de Henares. Esp::':I1 J
Su mmary R;.r min:lnI grazing sys tems of northern Portugal are pan o f the whol e f.:mnin g systems. rraditionai ly highly connected w ith mher agriculrural anciio r foresrr:v sys te ms . ..l.r presenr, rh ::: JQr.:J. ri:J.n rraditional SYStems are beco m ing more simple. with less connectiviry be!:\ve=n iiS c~ mD o n:::ms, ie:.!din g to a poor geneti c and ec ol ogic:J.i landsc:J.p e. Thi s pa pe r Jims to presenr the relarionships bet'.vee:1 ruminants and \andsc:lpe m the beginning of rh e 19805 (before Portugal' s accession to EU). LineJr correiation. mUltiple regression and cano nic::ll correl'Hion analys is (C C.~. ) were performed on th e nu mbe r o f sheep , goars, beef ::.nd dairy cows, and the are::!. o f si xteen lanj uSe types (from an nuai crops to older ra res t s.ands ) of 752 mun icipai iti es, to elucidate (he main land use types dere;mining ii':esrock disrribution. Two factors e:nerg:! 35 imoon2.n[ to understand that dynam ic: the cli mate grad iem and the ropogr;J.phic simarioo. The: firSt factor explains a transition bet\vee:1 she::;> and beef c::!. rti e: based in a more or less productive environmental climate. The second fa cto r takes pnysiogra;>ny as deter-moam 10 (he choice be':".'leen gOalS in sree p, stony and iOcky slruauo ns (he::lthi:.1nc) or dai~,,' c:::.nie 2.! the bOEom or b.rge valleys ( ailuv~um I.vlth \Ve ~ ::mnuai crops). Key,.vo rds: ru m1Oanrs. ianci use. and canonic o.i correlu[ion ana lysis. Por.:ugal.
I ntrod ucti o n Tras-os - Mon(e~ e Alto Douro (1 3 300 km i), in [he No n:he:!.sr o f PorrugaL is a region of high eiwlronmenr:J.i dive:-5ity (C3.5;:rO, 1996 ), prese:v'ed from Infl uences o f mode:-n ag ri cultural development of olher regions by di stanc e. mr::li exodus. mouo[J.tnOUS reli e f. e:c. (Rloe:ro. 19 87). Thelr tradition al fa nning sys tem s. as in mnny mher reglOns of the MediteL7J.r!e3n 8Jsin, afe clHlractc :! sed by low inputs o f meChanlSJtion ana chemic::d fe;tilis
Results There was high ly SIgnificant corre lation between land use and beef call ie. neg:H1ve with perenl1lai Cia ps and positive \vith the orner land use types (exc ept chestnuts). GoatS and da iry co ws had low si gnificant correlation \v ith land us e. Vineyards (negatively) and na.tur2! wet pas tures lpos iti ve ly) \ve re highly correl ate d wi th all speC les co nsldered (Ta ble I ). Tabl e 1. Signifi cant correlation between ruminant groups and land use types (blank - positive. d2s hed - negative ).
