WISE 在 30 x 30 弧秒全球网格上得出的土壤特性 这个世界衍生土壤特性的协调数据集 (WISE30sec).zip

上传者: 31988139 | 上传时间: 2021-08-10 14:04:52 | 文件大小: 89.32MB | 文件类型: ZIP
这个世界衍生土壤特性的协调数据集 (WISE30sec) 由土壤地理和土壤属性组件组成。 GIS 数据集是使用大尺度协调世界土壤数据库 1.21 版的土壤图单元划分创建的,并进行了小幅修正,叠加了气候区图 (Köppen-Geiger) 作为协变量,以及从分析得出的土壤特性估计ISRIC-WISE 土壤剖面数据库中对应的“土壤/气候”组合图。 该数据集考虑了全球农业生态分区、土地评估、作物生长模拟、土壤气体排放建模和全球环境变化分析通常需要的 20 种土壤特性。它提供了以下“最佳”估计值:有机碳含量、总氮、C/N 比、pH(H2O)、CECsoil、CECclay、有效 CEC、总可交换碱 (TEB)、碱饱和度、铝饱和度、碳酸钙含量、石膏含量、可交换钠百分比 (ESP)、电导率、粒度分布(沙子、淤泥和粘土的含量)、粗碎片的比例(小于 2 毫米)、堆积密度和可用水容量(-33 至 -1500 kPa );也是占主导地位的土壤排水类。 对于所谓的“合成”剖面(定义为它们的“土壤/气候”类)。各自的土壤特性估计值来自对 ISRIC-WISE 数据库工作副本中管理的大约 21,000 个土壤剖面数据的统计分析;这是使用基于分类法的复杂传输规则方案完成的,并辅以专家规则,这些规则考虑了预测的“in-pedon”一致性。使用的规则类型被标记以提供衍生数据中可能的置信度(即血统)的指示。 每个属性的最佳估计值以均值和标准差 (STD) 的形式给出,根据应用稳健数据异常值检测方案后剩余的样本总体计算得出。分析结果可以通过唯一的地图单元(网格单元)标识符与空间数据相关联,该标识符是土壤单元和气候类别代码的组合。大多数地图单元由多达十个不同的组件组成;其中每一个都有自己的衍生土壤特性范围和相关的统计不确定性。 技术文件中提供了对 200 厘米的全球土壤有机碳 (SOC) 储量的估计,作为可能应用的示例。

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