中国30米分辨率土壤可蚀性因子数据集

该数据集为2018年中国30米分辨率土壤可蚀性因子（K）栅格数据，数据是利用中国1979-1994年的全国第二次土壤普查的成果数据进行计算；再利用径流小区观测数据修正计算结果；将修订结果利用反距离权重插值法插值生成栅格数据。特殊地类河湖库塘、冰川及永久积雪、裸岩土地类型K因子值强制赋值为0。如果用户采用的土地利用精度较高，建议重新对以下土地类型的K因子强制赋值为0：河湖库塘、冰川及永久积雪、裸岩。如果有K值为0，但不属于上述类型的，K因子可按如下原则：取邻近相同土地类型图斑的K值，或取与该图斑邻近且不等于0的所有图斑K值的平均值。

This dataset is a 30-meter resolution raster dataset of soil erodibility factor (K) in China, 2018. The data was calculated using the results of the Second National Soil Survey of China conducted from 1979 to 1994, and then the calculation results were revised with observation data from runoff plots. The revised results were interpolated via the Inverse Distance Weighted (IDW) interpolation method to generate the final raster dataset. For special land types including rivers, lakes, reservoirs and ponds, glaciers and permanent snow cover, and bare rock, the K factor values were forcibly set to 0. If users employ land use data with higher accuracy, it is recommended to forcibly set the K factor values of the following land types to 0 again: rivers, lakes, reservoirs and ponds, glaciers and permanent snow cover, and bare rock. For any patches with a K value of 0 but not belonging to the above-mentioned land types, the K factor can be determined according to the following principles: take the K value of adjacent land patches of the same type, or calculate the average of the K values of all adjacent land patches with non-zero K values.

搜集汇总

背景与挑战

背景概述

该数据集是2018年中国30米分辨率的土壤可蚀性因子（K）栅格数据，用于评估土壤侵蚀和水土流失风险。数据基于1979-1994年全国第二次土壤普查成果计算，并利用径流小区观测数据修正，通过反距离权重插值法生成，确保了科学可靠性。数据集覆盖全国范围，特殊地类（如河湖、冰川）的K因子被赋值为0，适用于水土保持学研究和环境科学应用。