Nthuav fern - Salvinia natans

Fern Salvinia natans - me me, floating rau ntawm qhov chaw ntawm lub cev ntawm cov dej rau tsob nroj teej tug Salvinievyh tsev neeg. Qhov no hom tsiaj ntawm genus Salvinia - lub xwb loj hlob nyob rau hauv ib ncig ntawm lub Lavxias teb sab Federation. Cov nroj tsuag yog feem ntau cultivated raws li ib tug thoob dej yug ntses.

Salvinia natans: qauv thiab cov tsos

Qhov no ib xyoos ib zaug fern nrog ib tug nyias kav, xeeb kaum tsib centimeters nyob rau hauv ntev thiab muaj nyob rau txhua node ntawm peb nplooj whorls. Qia floating rau cov dej saum npoo. Ob khoom los xij ntawd yog ovate-elliptical zoo me ntsis lub plawv-zoo li tus puag. Lawv topped nrog cos uas nyob rau ntawm lub saum muaj ib Rev ntawm tuab luv luv plaub mos mos. Lub sab nto ntawm nplooj muaj ib tug tuab cover xim av plaub hau tuav cua bubbles. Qhov no enables Salvinia nyob rau cov dej saum npoo. Peb daim ntawv yog underwater, dissected rau plaub whiskers thiab qhia zoo heev nyob rau hauv tsos rau cov hauv paus hniav. Nyob rau hauv qhov tseeb, nws cia li ua lub zog ntawm cov hauv paus hniav nqus dej thiab as-ham, thiab kuj stabilizes lub fern.

Lifecycle Salvinia floating

Thaum lub hauv paus ntawm lub nplooj nyob rau hauv cov dej, muaj pawg ntawm plaub mus rau yim sori spherical. Ib txhia ntawm lawv muaj macro- thiab microsporangia thiab tom qab raug tsim txiv neej thiab poj niam gametophytes. Txhua megasporangia tsim plaub megaspory, tab sis muaj tsuas yog ib tug ntawm lawv. Feem ntau, nyob rau hauv ib daim ntawv microsporangia caum plaub microspores.

Raws li ib tug txoj cai, nyob rau hauv lub caij nplooj zeeg sori poob tawm thiab tog rau hauv qab ntawm lub reservoir. Muaj lawv siv lub caij ntuj no, thiab lub caij nplooj ntoos hlav yog kev puas tsuaj ntawm lawv cov plhaub. Sporangia ntab rau cov dej saum npoo thiab yuav ciaj sia. Tom qab rhuav cov phab ntsa hauv sporangia daim ntawv microspores trehkletochny txiv neej gametophyte thiab ces tsim los ntawm ob tug spermatogenic hlwb thiab ob ob muaj menyuam tsis taus nws hlwb. Txhua yam ntawm lawv ua plaub phev. Germinating, megaspory kuj lov cov plhaub rau poj niam gametophyte. Nws tsim nyob rau peb archegonium, tab sis tom qab fertilization muaj los ntawm lawv tsuas yog ib qho.

Lub cheeb tsam ntawm muab faib rau

Salvinia natans muaj ib tug zoo nkauj ntau yam: nws yog tus nais khu rau cov neeg Asmeskas dej, tsis kub tsis txias thiab tauj regions ntawm teb chaws Asia, raws li zoo raws li nyob rau hauv yav qab teb thiab hauv paus cov teb chaws Europe. Nyob rau hauv ib ncig ntawm lub Lavxias teb sab Federation, lub fern yog tsuas yog nyob rau hauv sab qab teb ntawm lub European ib feem, nyob rau hauv lub Far East, Western Siberia. Salvinia floating tus nais khu nyob rau hauv dej lub cev nrog qeeb ntws los yog sawv dej, feem ntau nws yuav pom nyob rau hauv lub oxbows loj Lavxias teb sab dej ntws.

Cov kev siv thiab tseem ceeb

Nyob rau ib tug saum npoo active reservoirs fern-li, thiab lwm yam, Salvini, cov ntaub ntawv tuab thickets uas thaiv kev nkag tau ntawm lub teeb mus rau cov dej lub cev, uas feem ntau ua rau cov teeb meem loj cov kev hloov nyob rau hauv ib tug reservoir ntawm ib puag ncig tej yam kev mob. Raws li ib tug tshwm sim, nyob rau hauv ntau lub xeev Salvinia floating tsob nroj yog suav tias yog teeb meem. Cuaj kaum, muaj yog nyob rau ntawm no fern thiab pab tau zog: piv txwv li, nws thickets pab raws li ib qho zoo heev qhov chaw nkaum rau cov ntses Fry.

Raws li twb tau hais, Salvinia Floating cultivated raws li thoob dej yug ntses nroj tsuag. Txawm li cas los, nws yog diluted, tsis tsuas yog raws li ib tug zoo nkauj keeb ntawm lub thawv, uas muaj cov ntses, tab sis kuj raws li ib tug zoo tej yam ntuj tso shader rau lwm yam nroj tsuag uas xav diffused teeb.

Cov ntsiab lus ntawm cov fern

Nws yog qhov zoo tshaj plaws rau muab tso rau lub Salvinia floating nyob rau hauv lub sov so tsis kub tsis txias los yog teb chaws sov taig. Los ntawm cov nqe lus ntawm lub ntsiab lus ntawm qhov tshwj xeeb uas yuav tsum tau ntawm cov nroj tsuag tsis qhia. Rau nws tsis tej dej hardness, yog acidity - thiab nyob rau hauv cov mos mos thiab tawv dej fern loj hlob Attendance zoo. Qhov kub nyob rau hauv lub tank yuav tsum tau khaws cia rau tom kawg 24 degrees Celsius. Yog hais tias cov dej yog sov xwb mus rau 20 degrees, nroj txoj kev loj hlob slows cia (cov nplooj los ua me me), tab sis tsis txhob kiag li.

Yog hais tias koj lub tank muaj Salvinia floating, tsis tu ncua yuav hloov tau cov dej. Raws li dag teeb pom kev zoo pab kiag li lawm tank pom zoo fitolampy muaj ib lub hwj chim ntawm peb watts ib liter, thiab fluorescent teeb. Yog hais tias koj siv incandescent qhov muag, ces kom paub tseeb tias lawv lub hwj chim yog me me, txwv tsis pub koj yuav qhuav li tej huab cua.