Ikamva elingaqinisekanga le-tundra: i-carbon sink engozini

  • I-tundra ilahlekelwa amandla okugcina i-carbon ngenxa yokutshintsha kwemozulu.
  • I-Thawing permafrost ikhupha izixa ezikhulu zeCO2 kunye nemethane.
  • Ukufuduka kweentlobo zezityalo kuchaphazela umjikelezo wekhabhoni we-tundra.
  • Ukufudumala kweArctic kunokunciphisa kakhulu i-tundra phakathi kwi-millennium.

iimpawu ze-tundra flora kunye nezinto ezinomdla

I-tundra ithathwa njengento ebalulekileyo umgodi wekhabhoni, esebenza njengesinki egcina isixa esikhulu sekhabhoni kumhlaba wayo onomkhenkce. Nangona kunjalo, iziphumo ze kutshintsha kwe mozulu Bawuguqula ngokunzulu lo msebenzi. Ukunyuka okuqhubekayo kwamaqondo obushushu kubangela ukukhululwa kwale carbon ngendlela ye ikharbon diokside (CO2) y methane kwiatmosfera, inyusa ubushushu behlabathi.

I-ecosystems yaseTundra, ehlala kwimimandla ye-arctic efana neGreenland, iSiberia kunye neAlaska, inomdla kakhulu kutshintsho lwemozulu. Kwiminyaka engaphezu kweshumi, abaphandi kwisikhululo saseZackenberg kumantla eGreenland baye babeka iliso kuhlahlo lwabiwo-mali lwekhabhoni. kumntla we-hemisphere tundra, ebonisa indlela izinto eziphilayo ezihlala kule mimandla zitshintsha ngayo indima yazo ukusuka kwi-carbon storage ukuya kwi-net emitters.

Kuphononongo lwakutsha nje, olupapashwe kwi Ijenali yoPhando lweGeophysical, kuyacaca ukuba i ukukhutshwa kwecarbon dioxide ngezinto eziphilayo ziyanda njengoko amaqondo obushushu enyuka. Ngokufanayo, inkqubo ye ifotosinthesis, isitshixo sokubamba i-CO2, nayo ichaphazeleka kakubi. Kukho amaqondo obushushu abalulekileyo, afana ne-7ºC, ekhe yadlula, ugcino lwekhabhoni kwezi nkqubo zendalo luyaphela.

Impembelelo yokutshintsha kwemozulu kwi-tundra carbon cycle

Impembelelo yokutshintsha kwemozulu kwi-tundra

Umjikelo wekhabhoni kwi-tundra uchaphazeleka ngokuthe ngqo ngamaqondo obushushu. Njengoko imozulu ishushu, umaleko ongaphezulu we-permafrost uyanyibilika, nto leyo evumela iintsholongwane ukuba zibole. izinto eziphilayo ekhenkcezisiweyo ngaphambili. Le nkqubo ibangela ukukhululwa kweemali ezinkulu ze-CO2 kunye methane, iigesi zegreenhouse ezandisa impembelelo yokutshintsha kwemozulu.

Izifundo ezahlukeneyo, ezifana naleyo ilawulwa yi NASA kwi-Arctic, bonisa ukuba i-tundra iguqukela ekuziphatheni okufanayo ngakumbi naleyo ye amahlathi e-boreal, i-ecosystems efumaneka kwiindawo ezisezantsi zesibanzi. Le nto ibandakanya ukufuduka kweentlobo zezityalo ezifana nezihlahla kunye nemithi emincinci ukuya emantla, ekwachaphazela umjikelo wekhabhoni.

Ukuqwalaselwa kwesathelayithi, kusetyenziswa itekhnoloji ephezulu njenge ICESat-2 y Indawo, yenze ukuba kube lula ukubhala olu tshintsho kumjikelo wekhabhoni kunye nokuhamba kwezityalo ukuya kwiArctic. Ngobuninzi bezityalo zamatyholo, i-tundra inokufunxa i-CO2 ethile, kodwa ukunyibilika kwe-permafrost kuhlala kusisisongelo esibalulekileyo, njengoko ukukhutshwa kwekhabhoni endala kuya kuphelisa nakuphi na ukufunxa okongeziweyo zizityalo.

Ukutshatyalaliswa kwangaphambili kunye nemiphumo yako

Ukunyibilika kwangoko kwi-tundra

Enye yeengxaki ezinkulu ezijongene ne-tundra ukuphelisa kwangoko ezinxulumene nokutshintsha kwemozulu. Iqela labaphandi liye labonisa ukuba ukuqhubela phambili kwentwasahlobo, okwenzeka ngenxa yobusika obunzima, kuguqula umjikelezo wobomi bezityalo kwi-tundra. Olu tshintsho lunokunciphisa ukukwazi kwe-tundra ukwenza njenge isinki yekhabhoni.

Umjikelo oqhelekileyo we-tundra uqinisekisa ukuba izityalo, njengoko zibola, zikhupha ngokukhawuleza i-carbon ebusika obude, okuvumela umhlaba ukuba uwugcine. Nangona kunjalo, ukunyibilika kwangethuba kudala ukungalingani kulo mjikelo, kuququzelela ukukhutshwa kweCO2 phambi kokuba izityalo zifunxe imiyinge ebalulekileyo ngephotosynthesis. Umphumo ube negalelo elikhulu ekwandeni kweegesi zegreenhouse.

Ukufudumala kweArctic kunye ne-tundra retreat

Phakathi kweziphumo ezimangalisayo zokufudumala kwe-Arctic yi ukuhlehla kwe-tundra. Ngokutsho kophando lwakutsha nje, ukuba amanyathelo okutshintsha kwemozulu ayisetyenziswanga ngokungqongqo, kuqikelelwa ukuba phakathi kweli nkulungwane, kuphela i-6% ye-tundra yangoku iya kuhlala kumntla-mpuma weRashiya. Le nkqubo ibangelwa ukwanda kweentlobo zemithi ezifana iSiberia larch, eqhubela phambili emntla ngesantya seekhilomitha ezingama-30 ngeshumi leminyaka, isusa izityalo zeempawu ze-tundra.

Olu tshintsho alunamiphumo kuphela kwizityalo ze-Arctic kunye nezilwanyana, kodwa luchaphazela amandla asele ebuthathaka e-tundra yokugcina i-carbon, ukukhawuleza ukutshintsha kwemozulu emhlabeni jikelele. Amaqondo obushushu ashushu avumela ukubola okukhulu kwe-organic matter, ethi yona ikhuphe ikhabhoni engakumbi kwi-permafrost.

I-tundra njenge-carbon sink engozini

Umngcipheko we-carbon sink kwi-tundra

Ngokomlando, i-tundra ithathwa njenge isinki yekhabhoni esebenzayo ngenxa yobushushu obuphantsi obunciphisa ukubola kwezinto eziphilayo. Nangona kunjalo, iziphumo zokufudumala kwehlabathi zibangela ukuba le ndima ye-sink ibe sengozini. Njenge iqabaka iyanyibilika, inani elikhulu lekhabhoni eligcinwe kangangeenkulungwane liqala ukukhutshwa, elinokuthi liguqule i-tundra ibe ngumthombo womnatha wekhabhoni kunesinki.

Izifundo zesayensi ziyaqhubeka nokuxoxa ukuba ezi ndawo ze-Arctic ziya kukwazi ukuqhubeka nokuzalisekisa indima yazo njenge-carbon sinks phantsi kweemeko zemozulu zangoku, kodwa into ecacileyo kukuba ukwanda lobushushu kwaye umhlaba onyibilikayo awuhambi kakuhle kwisakhono sokugcina ikhabhoni yetundra. Le meko ibangele ukuba uluntu lwezenzululwazi lubize ngokukhawuleza ukhuseleko lwale mixokomelwano yokuphilisana kwendalo, kuphunyezwe amanyathelo angqongqo okunciphisa utshintsho lwemozulu.

Uphononongo lwakutsha nje luyaqhubeka lubonisa ukuba i-tundra, i-ecosystem ebuthathaka, ikwinkqubo yotshintsho enokuguqula umsebenzi wayo ophambili njenge-carbon sink. Ngaphandle kwamanyathelo aneleyo, ukunyibilika okukhawulezileyo kwe-permafrost kuya kuqhubeka nokukhupha izixa ezikhulu zeegesi zegreenhouse, zinegalelo ngakumbi kubushushu behlabathi.


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