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Understanding recurrent land use processes and long-term transitions in the dynamic south-central United States, c. 1800 to 2006

机译:了解在美国动态的土地利用过程和长期过渡,C。 1800到2006年

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Highlights?The south-central US has a high rate of recurrent forest cover change.?Historically, the forest transitioned from degradation to conservation to intensive management.?Agricultural conversion to forest has occurred since c.1970s, however, net forest cover has decreased.?After the historical forest transition and recovery, land change is characterized by intensive forest use.Forests have historically been under significant land use pressures that cause periods of degradation, clearance, and recovery. To understand these changes, studies are needed that place trends in a historical landscape context and also examine recent dynamics. Here, we use historical investigation (c. 1800) and an examination of land use and land cover change between 1973 and 2006 to establish a baseline trajectory of the forested system of the south-central United States (US) plains. The study culminates in a highly detailed accounting of the processes and causes of land change between 2001 and 2006. In the study region, the forest transitioned from early low-intensity use, to clearance for farming and timber, to widespread recovery from degradation beginning in the 1930s. By 1970, the region was transitioning from recovered woodlands to an intensive regime of recurrent timber harvest and replanting. The recurring cycle inherent in intensive silviculture has been the main cause of land change for the past several decades, accounting for more than 95% of the total extent of change between 2001 and 2006. The transition to forest recovery in the south-central US was an important historical occurrence. However, the dynamic post-transition landscape needs to be better understood.
机译:亮点?美国南部美国具有高速率的森林覆盖率。“森林”转型从劣化到密集管理的森林转变。然而,自C.1970年代以来,森林覆盖率下降了对森林的影响。然而,净森林覆盖率下降。要了解这些变化,需要研究历史景观背景下的趋势,并检查最近的动态。在这里,我们使用历史调查(C.1800)和1973年至2006年之间的土地利用和土地覆盖变化,建立了美国南部美国森林制度(美国)平原的基准轨迹。该研究在2001年至2006年期间高度详细的土地变化的过程和原因的高度详细核对中。在研究区域,森林从早期低强度使用,到农业和木材的清关,从而从退化开始康复20世纪30年代。到1970年,该地区正在从回收的林地转变为经常性木材收获和重新种植的密集制度。造成密集造林固有的经常性周期一直是过去几十年土地变革的主要原因,占2001年至2006年至2006年期间变化总数的95%以上。在美国南部森林复苏的过渡是一个重要的历史事件。然而,需要更好地理解动态的过渡后横向。

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