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首页> 外文期刊>Regional Environmental Change >Land clearance not dieback continues to drive tree loss in a Tasmanian rural landscape
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Land clearance not dieback continues to drive tree loss in a Tasmanian rural landscape

机译：在塔斯马尼亚州乡村景观中，土地清理未消亡继续导致树木损失

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摘要

Tree cover has declined markedly since European settlement in the agricultural areas of Australia due to land clearing and natural and stress-induced senescence of remnant trees combined with widespread regeneration failure. These decreases in tree cover have seldom been quantified on a landscape scale, but are important in understanding losses in carbon storage and biodiversity across large areas of the continent. We used historical aerial photography and satellite imagery to study changes in tree canopy cover in the southern Tasmanian Midlands, one of the oldest agricultural regions in Australia. Tree cover at 1,000 random sites was assessed from imagery captured on four occasions between 1947 and 2010. Tree cover was stable between 1947 and the 1970s, but decreased from 33 % in the 1970s to 21 % in 2010. The decrease appeared driven by transition from some cover to no cover, rather than from more cover to less cover, because sites with tree cover in 2010 showed little net change during the study period. Statistical modelling showed soils derived from igneous rocks lost more cover than did the less fertile sedimentary soils, and contrary to the expectations, if drought was the cause of cover loss, sun-exposed north-facing sites did not lose more cover than south-facing ones. We argue that these temporal and spatial patterns of tree cover change are consistent with tree clearing rather than loss of remnant isolated trees due to drought-induced dieback.
机译：自欧洲在澳大利亚农业地区定居以来，由于土地清理，自然和压力引起的残留树木衰老以及广泛的再生失败，树木的覆盖率明显下降。这些树木的减少很少在景观尺度上被量化，但是对于了解整个非洲大陆大面积地区的碳储存和生物多样性的损失非常重要。我们使用历史航空摄影和卫星图像研究了塔斯马尼亚中部南部（澳大利亚最古老的农业地区之一）树木冠层的变化。根据1947年至2010年间四次拍摄的图像评估了1,000个随机站点的树木覆盖率。树木覆盖率在1947年至1970年代之间保持稳定，但从1970年代的33％下降到2010年的21％。有些覆盖是没有覆盖，而不是从增加到减少，因为在研究期间，2010年有树木覆盖的站点几乎没有净变化。统计模型显示，火成岩衍生的土壤比不那么肥沃的沉积土壤丧失更多的覆盖层，并且与预期相反，如果干旱是覆盖层丧失的原因，那么朝阳的朝北站点不会比朝南的站点失去更多的覆盖层。那些。我们认为，这些树木覆盖变化的时间和空间模式与清除树木是一致的，而不是由于干旱导致的枯死而造成的孤立孤树的损失。

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  • 来源
    《Regional Environmental Change》 |2013年第5期|955-967|共13页
  • 作者

    Lynda D. Prior; Gregor J. Sanders; Kerry L. Bridle; Scott C. Nichols; Rowan Harris; David M. J. S. Bowman;

  • 作者单位

    School of Plant Science, University of Tasmania, Private Bag 55, Hobart, TAS 7001, Australia;

    School of Plant Science, University of Tasmania, Private Bag 55, Hobart, TAS 7001, Australia,Department of Forest Ecosystem Science, University of Melbourne, 500 Yarra Boulevard, Richmond, VIC 3121, Australia;

    Tasmanian Institute of Agriculture, University of Tasmania, Private Bag 98, Hobart, TAS 7001, Australia;

    School of Plant Science, University of Tasmania, Private Bag 55, Hobart, TAS 7001, Australia;

    School of Plant Science, University of Tasmania, Private Bag 55, Hobart, TAS 7001, Australia,Greening Australia, GPO Box 1191, Hobart, TAS 7001, Australia;

    School of Plant Science, University of Tasmania, Private Bag 55, Hobart, TAS 7001, Australia;

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  • 正文语种 eng
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  • 关键词

    Tree canopy cover; Remnant woodlands; Rural tree decline; Tree regeneration; Temperate savanna; Tasmania;

    机译：树冠覆盖物;残留的林地;农村树木衰落;树木再生;温带大草原;塔斯马尼亚;

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