Foundation for Conservation in the Riverina Bioregion VIS_ID 984

"Vegetation coverage derived for the NSW Component of the Riverina Bioregion (IBRA). Data 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\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 NPWS 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. The mapis reliable for information regarding woody vegetation but limited in its capacity to describe Grasslands. The extension mapping is very 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. This 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_ID 984

本数据集为里维耶拉生物区（IBRA）新南威尔士州（NSW）部分的植被覆盖数据。该数据图层系K. A. 厄德利（新南威尔士州国家公园与野生动物服务局，1999）所主持的项目《里维耶拉生物区保护基础》的产出成果之一。

里维耶拉生物区植被地图（新南威尔士州部分）涵盖以下1:250 000比例尺图幅：蓬卡里（POONCARIE）、鲍尔拉纳德（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）、纳兰德拉（NARRANDERA）以及杰里德里里（JERILDERIE）。

本里维耶拉区域的植被覆盖数据源自多份地图数据源，主要包括：悉尼皇家植物园（Porteners, 1993）编制的《海伊平原：布利加尔-海伊与德尼利昆-本迪戈1:250 000比例尺地图》；（Porteners等人, 1997）编制的《蓬卡里1:250 000比例尺地图》；（Scott, 1992）编制的《鲍尔拉纳德-斯旺希尔1:250 000比例尺地图》，以及新南威尔士州境内该生物区北部边缘与东部区域基于陆地卫星（Landsat）影像开展的国家公园与野生动物服务局（NPWS）拓展制图。

本地图基于悉尼皇家植物园的制图成果衍生而来，因此需参考其原始出版物。该地图在木本植被（woody vegetation）相关信息上具备可靠度，但在描述草原（Grasslands）方面存在局限。本次拓展制图因实施周期紧凑、卫星影像目视解译存在局限且缺乏野外调查，导致分类结果较为笼统。拓展制图的核心局限在于将所有草原统一归为单一类别：受卫星影像应用限制，原生草原与改良牧场无法精准区分，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，零散分布的布利加林地（Acacia pendula，垂枝相思）也被归类为草原。

本次植被类型提取省略了结构细节，并将常见的区系类别进行归并。此举旨在实现不同来源地图间的一致性，以便在粗分类尺度上开展对比且不丢失区系细节。但需说明的是，移除结构与物种优势度信息会降低该制图在预测物种与栖息地分布方面的实用性。例如，该地图无法用于预测平原漫游者（Plains Wanderer）的栖息地，因该物种同时依赖植被结构与区系组成。

VIS_ID 984