Riverina Bioregion Vegetation Map (NSW component) VIS_ID 983

"Vegetation coverage derived for the NSW Component of the Riverina Bioregion (IBRA). \tData layer was prepared as part of the project ""A Foundation for Conservation in the Riverina Bioregion"" by K. A. Eardley (NSW National Parks and Wildlife Service, 1999).;\r\nNOTE: This map has a smaller coverage than ID 984.;\r\n;\r\nRiverina Bioregion Vegetation Map (NSW component) covers the following 1:250 000 map sheets: POONCARIE, BALRANALD, SWAN HILL, BOOLIGAL, HAY, DENILIQUIN, IVANHOE, CARGELLIGO, NARRANDERA and JERILDERIE.;\r\n;\r\nThe vegetation coverage for the Riverina was derived from a number of map sources, mainly the Royal Botanic Gardens, Sydney (Porteners, 1993) Hay Plain: Booligal-Hay and Deniliquin-Bendigo 1:250 000 maps; (Porteners et. Al., 1997) Pooncarie 1:250,000 map; (Scott, 1992) Balranald - Swan Hill 1:250,000 maps; and \tNPWS extension mapping from Landsat imagery for the northern periphery and eastern portion of the Bioregion within NSW. ;\r\n;\r\nThis map was derived from mapping prepared by the Royal Botanic Gardens, Sydney and therefore, the original publications should be reviewed. \tThe mapis reliable for information regarding woody vegetation but limited in its capacity to describe Grasslands. The extension mapping is \tvery broad due to the rapidity with which it was undertaken and the constraints associated with visual interpretation of satellite imagery and the lack of field survey. The main limitation to the extension mapping is the grouping of all Grasslands into one category. The constraint with using satellite imagery meant that native grasslands could not be accurately distinguished from improved pasture. Therefore, the 'Grassland' vegetation type includes the continuum from relatively undisturbed native grassland to improved pasture with few native species; similarly, Boree Woodland (Acacia pendula) with scattered individuals, is also classified as Grassland.;\r\n;\r\nVegetation types were derived by omitting structural detail and grouping common floristic categories. \tThis was a pragmatic decision to provide consistency between the various maps and to enable comparison at the coarse level without losing floristic detail. Nevertheless, it is acknowledged that the removal of the structural and species dominance information reduces the usefulness of the mapping for predicting species and habitat distribution. For example, it could not be used to predict Plains Wanderer habitat because this species is reliant upon vegetation structure as well as floristic composition.";\r\n;\r\nVIS_ID983

本数据集为里维耶拉生物区（Riverina Bioregion，IBRA）新南威尔士州（NSW）部分的植被覆盖数据。该数据图层由K. A. 厄德利（K. A. Eardley）于1999年受新南威尔士州国家公园与野生动物服务中心（NSW National Parks and Wildlife Service）委托，作为「里维耶拉生物区保护基础」（A Foundation for Conservation in the Riverina Bioregion）项目的一部分制作完成。
注意：本地图的覆盖范围小于编号984（ID 984）的数据集。

里维耶拉生物区植被地图（新南威尔士州部分）涵盖以下1:25万比例尺图幅：蓬卡里（POONCARIE）、巴勒纳尔德（BALRANALD）、斯旺希尔（SWAN HILL）、布利加尔（BOOLIGAL）、海伊（HAY）、德尼利昆（DENILIQUIN）、伊万霍（IVANHOE）、卡杰利戈（CARGELLIGO）、纳兰德（NARRANDERA）以及杰里德里（JERILDERIE）。

里维耶拉生物区的植被覆盖数据源自多份地图资料，主要包括：悉尼皇家植物园（Royal Botanic Gardens, Sydney）的《海伊平原：布利加尔-海伊与德尼利昆-本迪戈1:25万地图》（Porteners，1993）、《蓬卡里1:25万地图》（Porteners等，1997）、《巴勒纳尔德-斯旺希尔1:25万地图》（Scott，1992），以及新南威尔士州国家公园与野生动物服务中心（NPWS）基于陆地卫星（Landsat）影像完成的新南威尔士州境内生物区北部边缘与东部区域的扩展制图。

本地图的制图基础源自悉尼皇家植物园的成果，因此需参考原始出版资料进行核验。该地图在木本植被相关信息的表达上具备可靠性，但对草原（Grassland）的描述能力存在局限。由于制图周期紧凑、卫星影像目视解译存在局限性且缺乏野外调查支撑，本次扩展制图的分类较为宽泛。扩展制图的核心局限在于将所有草原类型归为单一类别：受卫星影像使用条件限制，无法准确区分原生草原与改良牧场，因此「草原」植被类型涵盖了从相对未受干扰的原生草原到本土物种稀少的改良牧场的连续谱系；同理，零散分布的布瑞林地（Boree Woodland，垂枝相思Acacia pendula）也被划归为草原类别。

本次植被类型的提取过程省略了结构细节，并将常见的区系类别进行归并：这一务实的决策旨在统一不同来源地图的分类标准，以便在粗分类尺度上进行比较且不丢失区系细节。但需说明的是，移除植被结构与物种优势度信息后，该制图数据在预测物种与栖息地分布方面的实用性有所降低。例如，该数据集无法用于预测平原漫游鸟（Plains Wanderer）的栖息地，因为该物种同时依赖植被结构与区系组成。

VIS_ID983