Photograph 1 [22423A]: When the USDA Forest Service’s Southern Forest Experiment Station began operating on July 1, 1921, the Station had its inaugural silvicultural research project already in the woods. In 1915, Samuel Trask Dana, C.R. Tillotson, and some others from the agency’s Washington office collaborated with Henry Hardtner and Urania Lumber Company to establish a series of plots on the Company’s lands in LaSalle and Winn parishes in central Louisiana (Wakeley and Barnett 2011). The plots were in young (10 to 20 years old), even-aged, old-field stands of loblolly (Pinus taeda) and shortleaf (Pinus echinata) pines, a common forest condition across much of the southern US. These typically overstocked and often burned pine stands represented an opportunity for future timber production, although silvicultural options for them were virtually unknown. Hence, Dana, Hardtner, and colleagues sought to investigate the response of these old-field stands using thinning practices developed in Europe but adapted for American forests. This January 1915 photograph by Dana shows one of the quarter-acre plots established in Winn Parish, Louisiana, with all trees numbered for study tracking purposes.

中文翻译：

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南方森林试验站第一次造林研究

照片 1 [22423A]：当美国农业部林务局的南部森林实验站于 1921 年 7 月 1 日开始运营时，该站的首个造林研究项目已经在树林中进行。1915 年，Samuel Trask Dana、CR Tillotson 以及该机构华盛顿办事处的其他一些人与 Henry Hardtner 和 Urania Lumber Company 合作，在该公司位于路易斯安那州中部的 LaSalle 和 Winn 教区的土地上建立了一系列地块（Wakeley 和 Barnett 2011） . 这些地块是在年轻（10 至 20 年）、偶龄、老地的火炬松（Pinus taeda）和短叶（Pinus echinata) 松树，这是美国南部大部分地区常见的森林状况。这些通常库存过多且经常被烧毁的松林代表了未来木材生产的机会，尽管它们的造林选择实际上是未知的。因此，Dana、Hardtner 及其同事试图使用在欧洲开发但适用于美国森林的间伐做法来调查这些老林林分的反应。这张 1915 年 1 月由 Dana 拍摄的照片显示了在路易斯安那州温教区建立的四分之一英亩地块之一，所有树木都进行了编号以进行研究跟踪。