Savannas thiab hav zoov ntawm Eurasia, Africa, North thiab South America

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Savannas thiab hav zoov ntawm Eurasia, Africa, North thiab South America
Savannas thiab hav zoov ntawm Eurasia, Africa, North thiab South America

Video: Savannas thiab hav zoov ntawm Eurasia, Africa, North thiab South America

Video: Savannas thiab hav zoov ntawm Eurasia, Africa, North thiab South America
Video: Daim phiaj saib sij hawm Zoo thiab Meej tshaj plaws 2024, Kaum ib hlis
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Savannahs thiab teeb hav zoov tau pom, raws li txoj cai, hauv subequatorial txoj siv sia. Cov cheeb tsam no muaj nyob rau hauv ob hemispheres. Tab sis cov seem ntawm savannah tuaj yeem pom nyob rau hauv subtropics thiab tropics. Thaj chaw no yog tus cwj pwm los ntawm ntau yam nta. Kev nyab xeeb nyob rau hauv savannah yog ib txwm ntub raws caij nyoog. Muaj qhov hloov pauv meej ntawm lub caij ntuj qhuav qhuav thiab los nag. Nws yog lub caij nyoog no uas txiav txim siab tag nrho cov txheej txheem ntuj. Woodlands thiab savannahs yog tus cwj pwm los ntawm cov av ferrallitic. Cov nroj tsuag ntawm cov cheeb tsam no yog sparse, nrog cais pawg ntoo.

Savanna kev nyab xeeb

savannas thiab hav zoov
savannas thiab hav zoov

Savannas thiab hav zoov muaj qhov xwm txheej huab cua. Ua ntej, nws yog qhov tseeb, kev hloov pauv ntawm ob lub sijhawm: drought thiab nag hnyav. Txhua lub caij, raws li txoj cai, kav txog rau lub hlis. Qhov thib ob, savanna yog tus cwj pwm los ntawm kev hloov pauv huab cua. Kev ntub dej equatorial tuaj tom qab qhuav tropical. Kev nyab xeeb kuj cuam tshuam los ntawm cov cua monsoon nquag. Lawv coj los nag hnyav raws caij nyoog nrog lawv. SavannahYuav luag ib txwm nyob nruab nrab ntawm thaj chaw qhuav ntawm cov suab puam thiab cov hav zoov equatorial. Yog li ntawd, cov toj roob hauv pes no pheej cuam tshuam los ntawm ob thaj chaw. Nyob rau tib lub sijhawm, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias noo noo tsis kav ntev txaus nyob rau hauv cov cheeb tsam no. Yog li ntawd, ntau-tiered forests tsis loj hlob ntawm no. Tab sis txawm tias lub caij ntuj no luv luv tsis pub cov savannah tig mus rau hauv suab puam.

Savanna av

Rau cov savannah thiab hav zoov yog qhov tshwj xeeb ntawm cov xim liab-xim av, nrog rau cov av dub sib xyaw. Lawv txawv feem ntau hauv cov ntsiab lus qis ntawm humus. Cov av yog saturated nrog cov hauv paus, yog li lawv cov pH yog ze rau nruab nrab. Lawv tsis fertile. Hauv qis qis, hauv qee qhov profile, ferruginous concretions tuaj yeem pom. Nyob rau nruab nrab, lub thickness ntawm lub Upper earthen txheej yog kwv yees li 2 meters. Nyob rau hauv cheeb tsam ntawm predominance ntawm liab-xim av av, tsaus-xim av montmorillonite tshwm nyob rau hauv qhov chaw uas lub nyem yog txo. Tshwj xeeb tshaj yog feem ntau xws li kev sib xyaw ua ke tuaj yeem pom hauv Deccan toj siab nyob rau sab qab teb.

Australian savannas

savannas thiab hav zoov ntawm Eurasia
savannas thiab hav zoov ntawm Eurasia

Cov savannas thiab hav zoov ntawm Australia nyob thaj tsam tseem ceeb ntawm thaj av loj. Lawv yog cov concentrated nyob rau sab qaum teb ntawm lub teb chaws. Lawv kuj nyob thaj chaw loj ntawm cov kob ntawm New Guinea, ntes yuav luag tag nrho sab qab teb. Australian savannah txawv. Nws tsis yog African lossis South American. Thaum lub caij los nag, nws thaj chaw tag nrho yog them nrog cov paj ci ntsa iab. Nws yog dominated los ntawm ranunculus, orchid thiab lily tsev neeg. Kuj nyob rau thaj tsam no feem ntaumuaj cereals.

Australian savanna kuj yog cov nroj tsuag ntoo. Feem ntau, eucalyptus, casuarina thiab acacia. Lawv yog cov concentrated nyob rau hauv nyias pawg. Casuarinas muaj nplooj nthuav heev. Lawv muaj cov ntu ntawm tus kheej thiab zoo li cov koob. Nyob rau hauv cheeb tsam no kuj muaj cov ntoo nthuav nrog cov pob tw tuab. Hauv lawv, lawv khaws cov dej noo tsim nyog. Vim hais tias ntawm no feature, lawv hu ua "lub raj mis". Lub xub ntiag ntawm cov nroj tsuag peculiar ua rau Australian savanna tshwj xeeb.

Savannas ntawm Africa

savannas thiab hav zoov ntawm South America
savannas thiab hav zoov ntawm South America

Cov savannas thiab hav zoov ntawm Africa los ntawm sab qaum teb thiab sab qab teb ciam teb ntawm hav zoov hav zoov. Qhov xwm ntawm no yog qhov tshwj xeeb. Nyob rau hauv ciam teb cheeb tsam, hav zoov maj mam nyias tawm, lawv muaj pes tsawg leeg ua noticeably poorer. Thiab ib thaj av ntawm savannah tshwm nyob rau hauv nruab nrab ntawm ib tug nruam hav zoov loj. Xws li kev hloov pauv ntawm cov nroj tsuag tshwm sim vim qhov luv luv ntawm lub caij los nag thiab qhov nce ntawm lub caij qhuav. Thaum koj tsiv mus deb ntawm thaj tsam equatorial, qhov qhuav qhuav yuav ntev dua.

Muaj qhov tseeb lub tswv yim hais tias xws li kev faib dav ntawm cov nyom siab siab, uas tau hloov los ntawm cov hav zoov sib xyaw deciduous thiab evergreen, yog ncaj qha cuam tshuam rau tib neeg kev lag luam. Tau ntev heev, cov nroj tsuag tau hlawv tas li hauv cov cheeb tsam no. Yog li ntawd, lub inevitable disappearance ntawm kaw ntoo txheej tshwm sim. Qhov no tau pab txhawb kom tuaj txog ntawm ntau pab tsiaj ntawm ungulate mammals rau thaj av no. Yog li ntawd, kev kho dua tshiab ntawm ntoozaub los yuav luag ua tsis tau.

Savannas thiab hav zoov ntawm Eurasia

African savannas thiab hav zoov
African savannas thiab hav zoov

Savannahs tsis muaj nyob hauv Eurasia. Lawv tsuas pom nyob rau hauv feem ntau ntawm Hindustan ceg av qab teb. Tsis tas li ntawd, cov ntoo tuaj yeem pom ntawm thaj chaw ntawm Indochina. Monsoon huab cua yeej nyob rau hauv cov chaw no. Hauv European savannahs, ib leeg acacias thiab xibtes ntoo loj hlob tuaj. Cov nyom feem ntau yog siab. Hauv qee qhov chaw koj tuaj yeem pom thaj tsam ntawm hav zoov. Cov savannas thiab hav zoov ntawm Eurasia txawv ntawm Africa thiab South America. Cov tsiaj tseem ceeb hauv thaj chaw no yog ntxhw, tsov, antelopes. Kuj tseem muaj ntau hom tsiaj reptiles. Tsis tshua muaj hav zoov yog sawv cev los ntawm cov ntoo deciduous. Thaum lub caij qhuav, lawv tawm nplooj.

Savannas thiab hav zoov ntawm North America

Australian savannas thiab hav zoov
Australian savannas thiab hav zoov

Thaj chaw savannah hauv North America tsis muaj dav li hauv Australia thiab Africa. Qhov chaw qhib ntawm cov hav zoov yog nyob tsuas yog los ntawm cov nroj tsuag herbaceous hom. Cov nyom siab hloov nrog cov kab tawg me me.

Cov ntoo ntau tshaj plaws uas qhia txog savannas thiab hav zoov ntawm North America yog mimosa thiab acacia. Thaum lub caij qhuav, cov ntoo no tawm lawv cov nplooj. Cov nyom qhuav qhuav. Tab sis thaum lub caij los nag, savannas tawg. Ib xyoos ib zaug, thaj tsam ntawm cov ntoo tsuas yog nce ntxiv. Lub ntsiab yog vim li cas rau qhov no yog lub active economic kev ua si ntawm txiv neej. Savannahs yog tsim nyob rau ntawm qhov chaw ntawm ib tug txiav down hav zoov. Tsiaj ntiaj tebcov cheeb tsam no muaj kev txom nyem ntau dua li ntawm lwm lub teb chaws. Qee hom ungulates, cougars, nas thiab ntau tus nab thiab lizards muaj nyob ntawm no.

Savannas ntawm South America

savannas thiab hav zoov ntawm North America
savannas thiab hav zoov ntawm North America

Cov savannas thiab hav zoov ntawm South America ciam teb ntawm hav zoov hav zoov. Vim yog kev hloov pauv huab cua, uas cuam tshuam nrog cov tsos ntawm lub caij qhuav ntev, cov cheeb tsam no tau txav mus rau ib leeg. Nyob rau hauv highlands ntawm Brazil, savannas nyob rau hauv ib tug tseem ceeb ib feem ntawm nws. Lawv yog concentrated nyob rau hauv lub hinterland. Ntawm no koj tuaj yeem nrhiav tau ib daim kab xev ntawm cov ntoo xibtes ntshiab.

Savannahs thiab hav zoov kuj nyob thaj chaw loj hauv Orinok Lowland. Lawv kuj pom muaj nyob hauv Guiana Highlands. Hauv Brazil, cov savannahs zoo dua lub npe hu ua campos. Cov nroj tsuag ntawm no yog sawv cev tsuas yog los ntawm hom cereal. Kuj tseem muaj ntau tus neeg sawv cev ntawm tsev neeg Asteraceae thiab legumes. Tsob ntoo daim ntawv tsis muaj kiag li nyob rau hauv qhov chaw. Hauv qee qhov chaw, koj tseem tuaj yeem pom thaj chaw deb ntawm me me thickets ntawm mimosa. Tsob ntoo zoo li cacti, spurges thiab lwm yam succulents thiab xerophytes kuj loj hlob ntawm no.

Brazilian Caatinga

Savannahs thiab hav zoov nyob rau sab qaum teb sab hnub tuaj ntawm Brazil yog sawv cev los ntawm cov hav zoov tsis tshua muaj, uas loj hlob feem ntau cov nroj tsuag drought-resistant thiab ntoo. Thaj chaw no hu ua "Caatinga". Cov av ntawm no yog xim liab-xim av. Tab sis nthuav ntau yog cov ntoo. Thaum lub caij qhuav, ntau ntawm lawv poob lawv cov nplooj, tab sis kuj muaj cov tsiaj uas muaj lub cev o. ATnws cov nroj tsuag accumulates ib tug txaus tus nqi ntawm noo noo. Cov hom no suav nrog, piv txwv li, vatochnik. Caatinga ntoo npog lianas thiab lwm yam nroj tsuag epiphytic. Tseem muaj ob peb hom ntoo xibtes nyob rau hauv cov cheeb tsam no. Qhov nto moo tshaj plaws ntawm lawv yog carnauba ciab xibtes. Zaub wax tau los ntawm nws.

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