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Vegetation classification in south-western Australia's Mediterranean jarrah forest: new data, old units, and a conservation conundrum
Australian Journal of Botany ( IF 1.1 ) Pub Date : 2021-07-28 , DOI: 10.1071/bt20172
Sarah Luxton , Grant Wardell-Johnson , Ashley Sparrow , Todd Robinson , Lewis Trotter , Andrew Grigg

Conservation reserve selection is guided by vegetation classification and mapping. New survey data and improvements in the availability of archived data through online data-sharing platforms enable updated classifications and the critique of existing conservation criteria. In the Northern Jarrah Forest Region of south-western Australia, percentage-based targets using ‘forest ecosystem units’ (15% of each unit) and the systematic conservation planning principles of ‘comprehensiveness, adequacy and representativeness’ underpin the State’s reserve network. To assess the degree of community-level heterogeneity within the forest ecosystem units, new survey data for the forest (30 000 plots) were classified using a non-hierarchical clustering algorithm. Results were assigned to the National Vegetation Information System, and community groups defined at the Association level (Level V). Significant community level heterogeneity was found, including 15 communities in the dominant ‘jarrah woodland’ unit, and 13 in the ‘shrub, herb and sedgelands’ unit. Overall, this research highlights limitations in the current reserve system, including the influence of scale on percentage-based targets and ‘representativeness’. A multi-scale approach to reserve selection, based on a quantitative, floristic, hierarchical classification system, would improve the level of scientific rigour underlying decision-making.



中文翻译:

澳大利亚西南部地中海贾拉森林的植被分类:新数据、旧单位和保护难题

保护区选择以植被分类和制图为指导。通过在线数据共享平台,新的调查数据和存档数据可用性的改进使更新分类和对现有保护标准的批评成为可能。在澳大利亚西南部的北贾拉林区,使用“森林生态系统单位”(每个单位 15%)的百分比目标和“全面、充分和代表性”的系统保护规划原则支撑着该州的保护区网络。为了评估森林生态系统单位内群落水平的异质性程度,使用非层次聚类算法对森林(30 000 个地块)的新调查数据进行分类。结果被分配到国家植被信息系统,和在协会级别(级别 V)定义的社区团体。发现了显着的群落水平异质性,其中 15 个群落位于优势“jarrah 林地”单元中,13 个群落位于“灌木、草本和莎草地”单元中。总体而言,这项研究突出了当前储备体系的局限性,包括规模对基于百分比的目标和“代表性”的影响。基于定量、植物区系、分层分类系统的多尺度保护区选择方法将提高决策的科学严谨性水平。这项研究强调了当前储备体系的局限性,包括规模对基于百分比的目标和“代表性”的影响。基于定量、植物区系、分层分类系统的多尺度保护区选择方法将提高决策的科学严谨性水平。这项研究强调了当前储备体系的局限性,包括规模对基于百分比的目标和“代表性”的影响。基于定量、植物区系、分层分类系统的多尺度保护区选择方法将提高决策的科学严谨性水平。

更新日期:2021-08-03
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