الحاجز الشجري بالسهول الكبرى

(تم التحويل من Great Plains Shelterbelt)
الحاجز الشجري بالسهول الكبرى
Great Plains Shelterbelt
Plains farms need trees LCCN98517930.jpg
Plains States Forestry Project poster created by the Works Progress Administration (1940)
Geography
الموقعالسهول الكبرى, الولايات المتحدة
Area18,600 ميل مربع
التأسيس1934

الحاجز الشجري بالسهول الكبرى (Great Plains Shelterbelt)، هو مشروع لإنشاء مصدات للرياح في ولايات السهول الكبرى بالولايات المتحدة الأمريكية، وقد بدأ عام 1934.[1]

أطلق الرئيس فرانكلن روزڤلت هذا المشروع استجابةً للعواصف الترابية الشديدة التي ضربت "صحن الغبار"، والتي تسببت في تآكل كبير للتربة. اعتقدت إدارة الغابات الأمريكية أن زراعة الأشجار على أطراف المزارع من شأنها أن تقلل من سرعة الرياح وتقلل من تبخر الرطوبة من التربة.

بحلول عام 1942، زُرع 220 مليون شجرة، غطت مساحة 48.000 كيلومتر مربع[2] في منطقة عرضها قرابة 1610 كيلومتر، تمتد من كندا إلى نهر برازوس في تكساس.

اعتبارا من عام 2007، "يمثل رد الفعل الفدرالي على عاصفة الغبار، بما في ذلك مشروع الغابات في ولايات البراري الذي زرع حزام المأوى في السهول الكبرى وإنشاء خدمة تآكل التربة، أكبر جهد وأكثر تركيزًا من جانب حكومة الولايات المتحدة لمعالجة مشكلة بيئية".[3][4]


التاريخ

Map of major planting areas of the shelterbelt project

The "Number One Shelterbelt" is located in Greer County, in southwestern Oklahoma. Oklahoma's first State Forester, George R. Phillips, had the distinction of planting the very first tree in the federal program's very first shelterbelt in 1935." The first tree was an Austrian pine planted on the H.E. Curtis farm near Willow, Oklahoma, on March 18.[3]

The project called for large-scale planting of trees across the Great Plains, stretching in a 100-mile wide zone from Canada to northern Texas, to protect the land from wind erosion. Native trees, such as red cedar and green ash, were planted along fence rows separating properties, and farmers were paid to plant and cultivate them. The project was estimated to cost $75 million over 12 years. When disputes arose over funding sources (the project was considered to be a long-term strategy and therefore ineligible for emergency relief funds), FDR transferred the program to the Works Progress Administration (WPA).[5]

The Great Plains Shelterbelt was allowed under the 1924 Clarke–McNary Act and was carried out by the WPA.[2] Project headquarters were in Lincoln, Nebraska,[6] and Raphael Zon served as the technical director. The U.S. Forest Service and Civilian Conservation Corps assisted.[7] "The Shelterbelt Program of 1935–1942 ... [was] later known as the Prairie States Forestry Project."[8]

By 1942, 30,233 shelterbelts had been planted, which contained 220 million trees and covered 18،600 ميل مربع (48،000 km2).[2]

جهود الترميم في القرن الحادي والعشرين

لماذا بنت الولايات المتحدة الأمريكية جدارًا عملاقًا من كندا إلى تكساس، حزام السهول الكبرى الواقي.

اعتبارا من 2010, "Many shelterbelts in Kansas and throughout the central Great Plains are old and are no longer providing the benefits that they used to", according to Kansas State Forester Larry Biles.[9]

اعتبارا من 2004 in Nebraska,

Today, the growth and vigor of many of the trees has declined due to close spacing, age, and invasion of undesirable, short-lived trees. The Nebraska Forest Service and the Upper Elkhorn Natural Resource District, in cooperation with the Schleusener family, has established two demonstration areas within this windbreak to show methods of improving the condition of the remaining trees and to encourage new growth and establishment of desirable trees. The area closest to the roadway will remain unaltered as a living reminder of the Prairie States Forestry Project and the efforts of Nebraskans to protect our valuable farmland.[7]

In 2010, federal grants were made available for shelterbelt maintenance and restoration in Kansas, North Dakota, South Dakota, and Nebraska as part of the Central Great Plains Shelterbelt Renovation and the Central Great Plains Forested Riparian Buffer CCPI proposals.[10][11] Funding for the CCPI (Cooperative Conservation Partnership Initiative) is provided as a project of the Department of Agriculture's Natural Resources Conservation Service.[9]

انظر أيضاً

المصادر

  1. ^ "Fighting the Drouth" Popular Mechanics, October 1934.
  2. ^ أ ب ت Hurt, R. Douglas. "Forestry on the Great Plains, 1902–1942". Kansas State University. Retrieved 2009-09-21.
  3. ^ أ ب "The "No. 1 Shelterbelt" celebrates 75 years". Southern Group of State Foresters. Retrieved 2012-03-02.
  4. ^ Sauer, Thomas. "The Dust Bowl's Prairie States Forestry Project: Model for an Effective Global Climate Change Strategy?" in The ASA-CSSA-SSSA International Annual Meetings (November 4–8, 2007).. Retrieved on 2012-03-02. 
  5. ^ "American Experience. Troublesome Creek". PBS. Retrieved 2012-03-02.
  6. ^ Hoagland, Bruce. "Shelterbelts". Encyclopedia of Oklahoma History and Culture. Oklahoma Historical Society. Retrieved 2012-03-01.
  7. ^ أ ب "The Prairie States Forestry Project". Nebraska History. Archived from the original on July 2, 2004. Retrieved 2012-03-02.{{cite web}}: CS1 maint: unfit URL (link)
  8. ^ Lana, E.. (1980). "Growth and survival of shelterbelts"., North Dakota State University. Retrieved on 2012-03-02. "The Clarke–McNary Act of 1924 provided Federal assistance that made it possible for landowners to purchase planting stock at cost. Governmental programs were developed in the 1930s to help relieve the effects of drought in the Great Plains. The Shelterbelt Program of 1935-1942 (later known as the Prairie States Forestry Project) was one of these programs. The purpose of the Shelterbelt Program was twofold: (a) the planting of windbreaks throughout the eastern plains to reduce wind erosion and (b) to provide relief employment. The program was administered by the U.S. Forest Service until 1942, when responsibility was transferred to the Soil Conservation Service. The purpose of the study was to inventory 20 Prairie States Forestry shelterbelts in Cass, Barnes and Ransom counties of southeastern North Dakota." 
  9. ^ أ ب "Shelterbelt Renovation". Kansas NRCS. Retrieved 2012-03-02.
  10. ^ "Funding now available to renovate shelterbelts". Dodge City Daily Globe. Dodge City, Kansas. 2010-07-27. Retrieved 2012-03-02.
  11. ^ "South Dakota Ag Connection – Funds Available to Renovate Shelterbelts, Forested Riparians". Retrieved 2012-03-02.

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