AWC to 60cm DSM data of the Victoria catchment NT generated by the Victoria River Water Resource Assessment

AWC to 60cm is one of 18 attributes of soils chosen to underpin the land suitability assessment of the Victoria River Water Resource Assessment (VIWRA) through the digital soil mapping process (DSM). AWC (available water capacity) indicates the ability of a soil to retain and supply water for plant growth. This AWC raster data represents a modelled dataset of AWC to 60cm (mm of water to 60cm of soil depth) and is derived from analysed site data, spline calculations and environmental covariates. AWC is a parameter used in land suitability assessments for rainfed cropping and for water use efficiency in irrigated land uses. This raster data provides improved soil information used to underpin and identify opportunities and promote detailed investigation for a range of sustainable regional development options and was created within the ‘Land Suitability’ activity of the CSIRO VIWRA. A companion dataset and statistics reflecting reliability of this data are also provided and can be found described in the lineage section of this metadata record. Processing information is supplied in ranger R scripts and attributes were modelled using a Random Forest approach. The DSM process is described in the CSIRO VIWRA published report ‘Soils and land suitability for the Victoria catchment, Northern Territory’. A technical report from the CSIRO Victoria River Water Resource Assessment to the Government of Australia. The Victoria River Water Resource Assessment provides a comprehensive overview and integrated evaluation of the feasibility of aquaculture and agriculture development in the Victoria catchment NT as well as the ecological, social and cultural (indigenous water values, rights and aspirations) impacts of development.

0至60cm土层有效持水量（available water capacity, AWC）是为维多利亚河水资源评估（Victoria River Water Resource Assessment, VIWRA）的土地适宜性评估提供支撑的18项土壤属性之一，其通过数字土壤制图（Digital Soil Mapping, DSM）流程完成建模。有效持水量表征土壤留存并供给植物生长所需水分的能力。本次发布的AWC栅格数据为0至60cm土层有效持水量的建模数据集（单位：每60cm土层持水量毫米数），基于实地分析数据、样条插值计算与环境协变量生成。有效持水量是雨养作物土地适宜性评估以及灌溉用水效率评估的关键参数。该栅格数据提供了优化后的土壤信息，可为一系列可持续区域发展方案的论证、机遇识别与深入调研提供支撑，由澳大利亚联邦科学与工业研究组织（CSIRO）VIWRA项目组的“土地适宜性”专项研发。同步发布的配套数据集与反映该数据可靠性的统计信息可参见本元数据记录的谱系（lineage）章节。数据处理流程以R语言ranger包脚本实现，土壤属性建模采用随机森林（Random Forest）方法。数字土壤制图流程的详细说明可参见CSIRO VIWRA发布的公开报告《北领地维多利亚流域土壤与土地适宜性》，该报告为CSIRO提交给澳大利亚政府的维多利亚河水资源评估技术报告。维多利亚河水资源评估全面概述并综合评估了北领地维多利亚流域水产养殖与农业开发的可行性，同时评估了开发活动带来的生态、社会与文化（原住民水价值、权益与诉求）影响。