Babban Filayen Shelterbelt

The Great Plains Shelterbelt wani aiki ne don ƙirƙirar iska a cikin jihohin Great Plains na Amurka, wanda ya fara a shekara ta 1934.  Shugaba Franklin D. Roosevelt ya fara aikin ne don mayar da martani ga guguwar ƙura mai tsanani na Dust Bowl, wanda ya haifar da mummunar lalacewar ƙasa. Hukumar kula da gandun daji ta Amurka ta yi imanin cewa dasa bishiyoyi a kan iyakokin gonaki zai rage saurin iska kuma ya rage kumburi daga ƙasa. A shekara ta 194, an dasa bishiyoyi miliyan 220, suna rufe murabba'in kilomita 18,600 (48,000 )  a cikin yanki mai faɗin kilomita 100 daga Kanada zuwa Kogin Brazos a Texas. Ko da ya zuwa 2007, "amsawar tarayya ga Dust Bowl, gami da Prairie States Forestry Project wanda ya dasa Great Plains Shelterbelt da kuma kirkirar Sabis na Rashin Rashin Ruwa, yana wakiltar mafi girma kuma mafi mayar da hankali ga kokarin [Amurka] gwamnatin don magance matsalar muhalli".

 Tarihi 
"Number One Shelterbelt" yana cikin Greer County, a kudu maso yammacin Oklahoma. Mai kula da gandun daji na farko na Jihar Oklahoma, George R. Phillips, yana da bambancin dasa itace na farko a cikin shirin tarayya na farko a 1935. "Itace na farko ita ce itacen Austrian pine da aka dasa a gonar HE Curtis kusa da Willow, Oklahoma, a ranar 18 ga Maris.

Aikin ya bukaci a dasa bishiyoyi masu yawa a fadin Great Plains, wanda ya shimfiɗa a cikin yanki mai faɗin kilomita 100 daga Kanada zuwa arewacin Texas, don kare ƙasar daga lalacewar iska. An dasa bishiyoyi na asali, kamar ja cedar da kore ash, tare da layukan shinge da ke raba dukiya, kuma an biya manoma don dasa su da noma su. An kiyasta aikin ya kai dala miliyan 75 a cikin shekaru 12. Lokacin da rikice-rikice suka taso game da tushen kudade (an dauki aikin a matsayin dabarun dogon lokaci sabili da haka bai cancanci samun kudaden agaji na gaggawa ba), FDR ta canja shirin zuwa ga Gudanar da Ayyuka (WPA)."Fighting the Drouth" Popular Mechanics, October 1934.

 Kokarin maidowa a karni na 21 
Ya zuwa 2010, "Yawancin shelterbelts a Kansas da kuma ko'ina cikin tsakiyar Great Plains sun tsufa kuma ba sa samar da fa'idodin da suka yi amfani da su", a cewar Kansas State Forester Larry Biles.

 Manazarta