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  • Vai Trò

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    Pé Côđơn
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    vai trò

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    10 views1 page

    Vai Trò

    Uploaded by

    Pé Côđơn

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOC, PDF, TXT or read online from Scribd
    Flag for inappropriate content
    of 1

    I.2.

    Vai tr ca rng: Cung cp lm sn, c sn phc v cho nhu cu tiu dng x hi, trc ht l g v lm sn ngoi g Cung cp ng vt, thcvt l c sn phc v nhu cu tiu dng ca cc tng lp dn c. Cung cp nguyn liu cho cng nghip, cho xy dng c bn. Cung cp dc liu qu phc v nhu cu cha bnh v nng cao sc khe cho con ngi. Cung cp lng thc, nguyn liu ch bin thc phm...phc v nhu cu i sng x hi... +Vai tr phng h, bo v mi trng sinh thi Phng h u ngun, gi t, gi nc, iu ha dng chy, chng xi mn ra tri thoi ha t, chng bi p sng ngi, h p, gim thiu l lt, hn ch hn hn, gi gn c ngun thy nng ln cho cc nh my thy in. Phng h ven bin, chn sng, chn gi, chng ct bay, chng s xm nhp ca nc mn...bo v ng rung v khu dn c ven bin... Phng h khu cng nghip v khu th, lm sch khng kh, tng dng kh, gim thiu ting n, iu ha kh hu to iu kin cho cng nghip pht trin. Phng h ng rung v khu dn c: gi nc, c nh ph sa, hn ch l lt v hn hn, tng m cho t... Bo v khu di tch lch s, nng cao gi tr cnh quan v du lch... Rng cn l i tng nghin cu ca nhiu lnh vc khoa hc, c bit l ni d tr sinh quyn bo tn cc ngun gen qu him. +Vai tr x hi L ngun thu nhp chnh ca ng bo cc dn tc min ni, l c s quan trng phn b dn c, iu tit lao ng x hi, gp phn xa i gim ngho cho x hi... +Vai tr ca rng trong cuc sng Nu nh tt c thc vt trn Tri t to ra 53 t tn sinh khi ( trng thi kh tuyt i l 64%) th rng chim 37 t tn (70%). V cc cy rng s thi ra 52,5 t tn (hay 44%) dng kh phc v cho h hp ca con ngi, ng vt v su b trn Tri t trong khong 2 nm (S.V. Belov 1976). Rng l thm thc vt ca nhng cy thn g trn b mt Tri t, gi vai tr to ln i vi con ngi nh: cung cp ngun g, ci, iu ha kh hu, to ra oxy, iu ha nc, ni c tr ng thc vt v tng tr cc ngun gen qu him. Mt ha rng hng nm to nn sinh khi khong 300 - 500 kg, 16 tn oxy ( rng thng 30 tn, rng trng 3 - 10 tn). Mi ngi mt nm cn 4.000kg O2 tng ng vi lng oxy do 1.000 - 3.000 m cy xanh to ra trong mt nm.

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