Economics of Australian Soil Conditions 1996/97 – Relative Yield From Salinity in 2000 (%)

\n\nRelative Yield From Salinity in 2000 (%) dataset is one of 11 national\nsurfaces, represented by ~1km grids, relating to economic opportunities\nassociated with soil condition. All dollar values are given in 1996/97\nAustralian dollars. There are three sub-types of data in this dataset:\nrelative yields, gross benefits and impact costs. Each is described as\nfollows:1. Relative yield (RY): This is the yield of the crop or pasture,\nrelative to its full potential expressed as a percentage. It is equal to\nactual yield divided by potential yield. The relative yield surfaces, measured\nas a ratio (0 to 1) and represented with a 1km grid, include: * ry_salt2000;\nry_salt2020: The relative yield of salinity in the year 2000 and 2020*\nry_Acid; ry_Esp: The relative yield from soil acidity and soil sodicity*\nry_min: The limiting factor relative yield a minimum of ry_salt2000, ry_acid,\nry_esp and ry_min.* lim_fact:Factor most limiting yield a of acidity, sodicity\nand salinity 2. Gross benefit (GB): The gross benefit is the additional profit\nat full equity attainable through agricultural production if the yield-\nlimiting factor of salinity, acidity or sodicity were repaired without cost.\nAs such it can be considered an approximate investment ceiling on treating the\nsoil. The gross benefit grids are measured in $/ha/yr and include:* gb97a;\ngb97e; gb97s a for soil acidity; sodicity; salinity* gb97m a the combined\nlimiting factor gross benefit. 3. Impact cost (ic97s): This is the decline in\nagricultural profit at full equity due to worsening dryland salinity severity\nand extent over the time period 2000 to 2020. It is measured in $/ha/yr. It is\ndetermined only through changes in crop yield as a consequence of changes in\ndryland salinity. Impact cost can be considered the loss in profit at full\nequity due to worsening salinity over the 20yr time period. Keywords:\nEconomics, Natural Resources, Australia, Salinity, Sodicity, Acidity, Soil\nTreatmentData is in albers and unprojected, using WGS84 and GDA94.\n\nSee [further metadata](http://data.daff.gov.au/anrdl/metadata_files/pa_easc_r9cl\n__08312a10.xml) for more detail.\n\n

2000年盐渍化相对产量（Relative Yield From Salinity in 2000 (%)）数据集为11个国家级地表数据集之一，以约1公里分辨率的网格为数据载体，关联与土壤状况相关的经济价值。所有货币价值均以1996/1997年度澳大利亚元计价。

本数据集包含三类数据子类型：相对产量、总收益与影响成本，具体说明如下：
1. 相对产量（Relative Yield, RY）：指作物或牧草的实际产量相对于其潜在最高产量的百分比，计算公式为实际产量除以潜在产量。该类地表数据以比值（0至1）表示，采用1公里网格存储，包含以下数据集：
- ry_salt2000、ry_salt2020：分别代表2000年与2020年盐渍化影响下的相对产量；
- ry_Acid、ry_Esp：分别代表土壤酸性与土壤碱化影响下的相对产量；
- ry_min：以ry_salt2000、ry_acid、ry_esp三者中的最小值计算得到的限制因子相对产量；
- lim_fact：表征酸度、碱度与盐渍化中对产量限制最为显著的因子。
2. 总收益（Gross Benefit, GB）：指在无需成本修复盐渍化、酸性或碱化等产量限制因子的前提下，通过农业生产可获得的全权益额外利润，可近似视为土壤治理的最高投资上限。该类网格数据以美元/公顷/年为单位，包含以下数据集：
- gb97a、gb97e、gb97s：分别对应土壤酸性、碱化与盐渍化治理的总收益；
- gb97m：对应综合限制因子的总收益。
3. 影响成本（Impact Cost, ic97s）：指2000年至2020年间，旱地盐渍化程度加剧与范围扩张导致的全权益农业利润损失，单位为美元/公顷/年。该指标仅通过旱地盐渍化变化引发的作物产量变化计算得出，可视为20年周期内盐渍化恶化带来的全权益利润损失。

关键词：经济学、自然资源、澳大利亚、盐渍化、碱化、酸性、土壤治理。

本数据集采用阿尔伯斯投影（Albers）与无投影模式，坐标系使用WGS84与GDA94。

更多详细信息可参阅[补充元数据](http://data.daff.gov.au/anrdl/metadata_files/pa_easc_r9cl__08312a10.xml)。