Tafkin Vernal

Tafkin vernal, wanda kuma ake kira tafkunan vernal ko tafkunan ephemeral, tafkunan ruwa ne na yanayi na yanayi waɗanda ke ba da wurin zama ga ciyayi da dabbobi daban-daban. Ana la'akari da su a matsayin wani nau'in dausayi na musamman wanda yawanci ba shi da kifaye, don haka yana ba da damar haɓaka lafiya na amphibian da nau'in ƙwari waɗanda ba za su iya jure gasa ko tsinuwar kifin ba. Wasu zuriyar kifin wurare masu zafi (kamar killifishes) duk da haka sun dace da wannan wurin musamman.

Vernal wuraren waha nau'in ciyayi ne. Za a iya kewaye su da al'ummomi / nau'o'i da yawa ciki har da gandun daji, ciyayi, gandun daji na Lodgepole, itacen itacen oak mai launin shuɗi, sagebrush steppe, ƙwanƙarar bakin teku da kuma prairie. Waɗannan wuraren tafkuna suna da yanayin yanayin Bahar Rum, amma suna faruwa a cikin sauran halittu masu yawa.

 Tsari da ci gaban shekara 
A cikin mafi yawan shekaru, rafin ruwa na vernal zai fuskanci ambaliya daga ruwan sama/hazo, sannan kuma bushewa daga ƙawance. Waɗannan sharuɗɗan suna da alaƙa da yanayin Bahar Rum kamar tsakiyar kwarin California.California's Vernal Pools". wildlife.ca.gov. Retrieved June 8, 2020. Wuraren tafki na Vernal sau da yawa halayen yanayin yanayin Bahar Rum ne, amma suna faruwa a cikin sauran halittu masu yawa, kamar wuraren dazuzzuka na Garkuwar Kanada, inda suke da wahalar ganowa saboda dajin.Luymes, Nick; Chow-Fraser, Patricia (July 4, 2021). "Detection of Potential Vernal Pools on the Canadian Shield (Ontario) Using Object-Based Image Analysis in Combination with Machine Learning". Canadian Journal of Remote Sensing. 47 (4): 519–534. doi:10.1080/07038992.2021.1900717. ISSN 0703-8992. Yawancin wuraren tafkuna suna bushe aƙalla wani ɓangare na shekara, kuma suna cika da ruwan sama na hunturu, dusar ƙanƙara ta bazara da tasoshin ruwa. Wasu wuraren tafkuna na iya kasancewa aƙalla cike da ruwa a cikin tsawon shekara guda ko fiye, amma duk wuraren tafkuna suna bushewa lokaci-lokaci. Yawanci, ko da yake, tafkin vernal yana da matakai uku a kowace shekara: yana cike da ruwa a cikin hunturu (lokacin da ba a cika ba) tare da tafkin vernal da ke riƙe da ruwa daga kwanaki 10-65, yana bushewa a hankali a lokacin bazara (lokacin fure), kuma yana bushewa gaba ɗaya a lokacin rani (bushe lokaci). Tafkunan Vernal sun fi son jinsunan asali saboda yawancin nau'ikan da ba na asali ba ba za su iya jure wa matsanancin canjin yanayi na yanayi ba.

Wasu wuraren tafkunan vernal suna da laka mai yumɓu (wanda kuma aka sani da hardpan) wanda ke rage ɓarnar ruwa. Ruwan da ba zai iya jurewa ba shine hydrophobic kuma yana hana ruwa daga magudanar ruwa zuwa cikin ƙasan ƙasa, yana barin wuraren tafki su zama cikin ruwa na dogon lokaci. Wannan yanayin tafkunan vernal yana nufin cewa ana barin ruwan ya ƙafe a hankali maimakon magudanar ruwa. Wannan shi ne babban abin da ke haifar da ci gaban al'ummomin shukar wuraren shakatawa na vernal yayin da yake kiyaye ƙasa a gefen ruwa don kawai jikewa ga al'ummomin tsire-tsire na vernal su bunƙasa yayin da waɗanda ke kusa da tsakiyar tafkin suka fi mamayewa, wanda ke haifar da yanki na yankunan shuka yayin da matakin ruwa ya koma baya. Wannan Layer na yumbu kuma yana ba da damar wuraren tafki su wanzu tsawon lokaci don hana nau'ikan da ke sama daga tasowa, yayin da suke da isasshen lokaci don hana nau'in tsire-tsire na ruwa daga mamayewa.Barbour, Michael; Keeler-Wolf, Todd; Schoenherr, Allan A. (July 17, 2007). Terrestrial Vegetation of California, 3rd Edition. University of California Press. pp. 394–424. ISBN 978-0-520-24955-4

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