Australia’s most fragmented and least reserved landscapes are the grassy eucalypt woodlands of the south-east. Two hundred years of agricultural disruption have transformed these landscapes, and agricultural enterprises continue to expand and develop, meaning the threats to these landscapes have not abated. The Tasmanian Midlands is primarily privately owned, with very little area devoted to conservation of biodiversity. In this landscape, conservation covenants have been enacted on many private properties with the intention of encouraging tree recruitment and conservation of threatened plant communities and rare species. Evidence of the effectiveness of these covenants in protecting overstorey tree population health is lacking. This study compared the demographic structures of overstorey Eucalyptus species and midstorey tree genera on public and private properties with contrasting land use histories. Reserves on private lands had little tree recruitment, probably because exotic pasture species were common, whereas tree recruitment was abundant in public reserves, where pasture improvement has not occurred. Active measures are needed to restore ecological structure and function in grassy woodland conservation reserves on private land by encouraging regeneration of Eucalyptus and Acacia species as well as returning the ground layer to a functionally native state. This will entail reinstating fire disturbance, reducing exotic pasture species cover and managing domesticated, feral and native herbivores.

中文翻译：

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牧场改良的遗产导致塔斯马尼亚中部的桉树林地保护保护区招募失败

澳大利亚最分散和保留最少的景观是东南部的桉树林地。200 年的农业破坏改变了这些景观，农业企业不断扩张和发展，这意味着对这些景观的威胁并未减弱。塔斯马尼亚中部地区主要为私人所有，用于保护生物多样性的区域很少。在这片土地上，许多私人财产都制定了保护公约，目的是鼓励树木招募和保护受威胁的植物群落和稀有物种。缺乏这些契约在保护上层树木种群健康方面的有效性的证据。本研究比较了公共和私人财产上的上层桉树物种和中层树属的人口结构与对比的土地利用历史。私人土地上的保护区几乎没有树木补充，可能是因为外来牧草物种很常见，而公共保护区的树木补充丰富，那里的草场没有改善。需要采取积极措施，通过鼓励桉树和金合欢树种的更新以及将地层恢复到功能性原生状态，来恢复私有土地上草地林地保护保护区的生态结构和功能。这将需要恢复火灾干扰，减少外来牧草物种的覆盖并管理驯化、野生和本地食草动物。私人土地上的保护区几乎没有树木补充，可能是因为外来牧草物种很常见，而公共保护区的树木补充很丰富，那里的草场没有发生改善。需要采取积极措施，通过鼓励桉树和金合欢树种的更新以及将地层恢复到功能性原生状态，来恢复私有土地上草地林地保护保护区的生态结构和功能。这将需要恢复火灾干扰，减少外来牧草物种的覆盖并管理驯化、野生和本地食草动物。私人土地上的保护区几乎没有树木补充，可能是因为外来牧草物种很常见，而公共保护区的树木补充丰富，那里的草场没有改善。需要采取积极措施，通过鼓励桉树和金合欢树种的更新以及将地层恢复到功能性原生状态，来恢复私有土地上草地林地保护保护区的生态结构和功能。这将需要恢复火灾干扰，减少外来牧草物种的覆盖并管理驯化、野生和本地食草动物。需要采取积极措施，通过鼓励桉树和金合欢树种的更新以及将地层恢复到功能性原生状态，来恢复私有土地上草地林地保护保护区的生态结构和功能。这将需要恢复火灾干扰，减少外来牧草物种的覆盖并管理驯化、野生和本地食草动物。需要采取积极措施，通过鼓励桉树和金合欢树种的更新以及将地层恢复到功能性原生状态，来恢复私有土地上草地林地保护保护区的生态结构和功能。这将需要恢复火灾干扰，减少外来牧草物种的覆盖并管理驯化、野生和本地食草动物。