Macquarie Marshes Vegetation Mapping, 1991. VIS_ID 794

Vegetation Map of the Macquarie Marshes - This map includes a vegetation survey for 1991 carried out by Bob Wilson as a contract for NSW NPWS. All surveys provide a detailed map of upper canopy vegetation that has been interpreted from aerial photography. Mapping shows major vegetation associations and dominant flora. The complete set of maps and surveys is referenced as 'Macquarie Marshes Vegetation Surveys' in the Status Report, Vegetation Mapping in the Central West Region, Department of Land and Water Conservation 1998. pp73-75.\r\n\r\n\r\n\r\nHistorical Vegetation Mapping in the Macquarie Marshes 1949-1991.\r\n\r\nThis study aimed to quantify changes in the distribution of nine tree species in the Macquarie Marshes from 1949 to 1991. Aerial photography was digitised to produce GIS maps from both years, which were then compared to determine the changes in distribution over the 42 year period. Changes in distribution did not follow the same pattern for all tree species over the mapped period. While the River Red Gum community was found to be stable in its distribution, Black Box recorded a 38% decline in distribution over the same period. Land clearing represented the single greatest impact upon eucalypt distribution between the years 1949-1991. By contrast the acacias and dryland species expanded in ditribution over the same period, often exploiting areas from which eucalypts had been cleared. VIS_ID 794

麦夸里沼泽植被地图集——本图集包含鲍勃·威尔逊（Bob Wilson）于1991年受新南威尔士州国家公园与野生动物服务局（NSW NPWS）委托开展的植被调查成果。所有调查成果均基于航空摄影影像解译得到的上层冠层植被详细分布图，标注了主要植被群系与优势植物类群。整套地图与调查内容在1998年由土地与水资源保护部发布的《中西部地区植被测绘现状报告》中以“麦夸里沼泽植被调查”为名被引用，具体页码为第73-75页。

1949-1991年麦夸里沼泽历史植被测绘

本研究旨在量化1949年至1991年间麦夸里沼泽内9种树木的分布变化。研究人员对两个年份的航空摄影影像进行数字化处理，生成地理信息系统（GIS）地图，并通过对比分析这42年间的分布变化情况。在此测绘周期内，不同树种的分布变化模式并不统一：其中赤桉（River Red Gum）群落的分布范围保持稳定，而黑盒桉（Black Box）的分布范围在此期间下降了38%。1949年至1991年间，土地开垦是影响桉属植物分布的最主要因素。与之相反，金合欢属（Acacia）植物与旱地物种的分布范围在此期间出现扩张，往往会占据桉属植物被开垦后的区域。
VIS_ID 794