Yankin tsaunuka na Rocky

Yankin Rocky Mountains shi ne yankin biotic nan da nan a ƙarƙashin layin itace a cikin Rocky Mountaines na Arewacin Amurka. A arewacin New Mexico, yankin subalpine yana da tsaunuka kusan daga cikin shekara ta 9,000 zuwa 12,000 feet (2,700 zuwa 3,700 ;  yayin da a arewacin Alberta, yankin suvalpine ya kai daga 1,350 zuwa 2,300 mita (4,400 zuwa 7,500 . 

## Yanayi
Yanayin yanayi na yankin Rocky Mountains ba shi da dumi, tare da lokacin rani wanda ya kai  ° F (24 ° C) a kwanakin da suka fi zafi kusa da yankin montane, kuma yawanci ya kasa isa  ° F (16 ° C) kusa da layin itace; Frost na iya faruwa a kowace rana ta shekara. Kodayake yanayin zafi na hunturu na iya zama mai dumi fiye da waɗanda ke cikin kwari masu ƙasƙanci, yawanci suna kasancewa sama da -10 ° F (-23 ° C), dusar ƙanƙara mai ban mamaki ta rufe yankin sosai a cikin bazara. Wasu raguwa na iya kasancewa cikin bazara. Ruwan sama, yawanci tsawa, sau da yawa yana samuwa da sauri kuma akai-akai ya haɗa da graupel ko hail. Kodayake ba a saba gani ba, iskar guguwa na iya tasowa kuma ta haifar da mummunar lalacewa kamar Routt Divide Blowdown . 

## Tsire-tsire da dabbobi

A cikin Dutsen Rocky na Arewacin ƙasar Amurka, yankin yana da alamar maida hankali ga fir da Engelmann spruce kuma gabaɗaya ban da bishiyoyi da aka fi samun su a ƙananan tsaunuka kamar aspen, ponderosa Pine na lodgepole pine. A wasu yankuna, Engelmann spruce da subalpine fir sun haɗu da ko kuma sun ba da hanya ga bishiyoyi daban-daban, kamar limber pine, whitebark pine da bristlecone pine, wasu firs kamar Douglas-Fir na azurfa fir, da junipers daban-daban da sauran nau'ikan hardy. Yankunan da aka ƙone a baya na iya ƙunsar adadi daban-daban, ko ma kusan tsarkakewa, na itacen pine. Rufin ƙasa a cikin gandun daji da aka ƙone a baya sau da yawa ya haɗa da nau'ikan huckleberry guda biyu.

A kan fallasawa, bushewa gangara a tsaunuka masu tsawo, subalpine farin pine gandun daji maye gurbin spruce-fir. Yawancin nau'o'in gandun daji na fararen pine sun haɗa da whitebark pine a arewacin Rocky Mountains, limber pine a tsakiya da arewa maso tsakiyar Rocky Mountaines, da bristlecone pine a kudancin Rocky Mountins. Lokaci na yau da kullun tsakanin gobara ya kasance daga cikin shekaru 50 zuwa ciki shekara 300. White pines suna jure wa matsanancin yanayin muhalli kuma suna iya zama muhimman nau'ikan da suka biyo bayan wuta. A wurare masu tsawo, wuraren da iska ke hurawa, itatuwa galibi suna girma cikin siffofi masu banƙyama.

Whiteebark pine wani nau'in maɓalli ne a cikin gandun daji na arewacin Rocky Mountains .  Koyaya, furen whitebark ya kasance yana raguwa saboda White Pine Blister Rust: mutuwar furen whatebark a wasu yankuna ya wuce 90%. Dukkanin wuraren da ake gani a gandun daji, kamar wannan a Avalanche Ridge kusa da ƙofar gabashin Yellowstone National Park, suna da faɗin matattu, launin toka.

Saboda matsanancin hunturu da karancin kayan abinci, tashar jiragen ruwa ta subalpine ta iyakance nau'in dabbobi na asali. Duk da yake bears da Cougar suna ziyartar subalpine, lynx, hare, American marten da kuma wasu Squirrels suna daga cikin ƴan muhimman dabbobi masu shayarwa. Wasu tsuntsaye, kamar su dutsen Chickadee da Steller's jay ana ganinsu kuma ana jin su a yankunan Rocky Mountain, tare da wasu kamar owls, nuthatches da wasu finches da ba su da bayyane.

## Manazarta