1.marta biomes
TRANSCRIPT
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BIOMESBIOMES
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Des de la Des de la Pobla de Segur Pobla de Segur a Senterada a Senterada
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Als peus del Pirineu✔ A 500 mts d'altitud, trobem vegetació típica
de la zona temperada domini mediterrani.✔ Hi predominen els alzinars amb sotabosc
dens, tota la vegetació de fulla perenne, petita i dura (esclerotitzada), adaptada a la sequera.
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De camí a Senterada observem canvis en el paisatge, encara som a 500 mts d'alçada. Apareixen pins!
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✔ Els pins, del grup de les coníferes, tenen forma de con per evitar l'acumulació de la neu. Molt diferents als pins propers a la platja, de terra baixa.
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✔ Els pins i les alzines es barregen
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✔ Però a mig camí sembla que retrocedim, els pins i les alzines donen lloc a una vegetació arbustiva baixa, sense arbres, similar a la màquia, Que deu passar?
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✔ El sòl, es rocós, i la roca calcària.
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✔ De cop, apareix l'aigua, i al voltant, tota la vegetació varia, ni pins ni alzines ni arbustos, tot són arbres verds, caducifolis, de fulla ampla, és vegetació de ribera!
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✔ Hem girat a Senterada i tornem cap a Pobla, pel camí observem com a mà esquerra hi ha alzines fins a mitja muntanya, uns 700-800 mts, a partir dels quals els pins hi predominen. Contràriament, a mà dreta de la carretera, els pins hi són presents des de baix de tot, Per què serà?
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