中国1公里土壤砂粒含量数据（2010-2018，0-5cm）

自然土壤的矿物质都是由大小不同的土粒组成的，各个粒级在土壤中所占的相对比例或质量分数，称为土壤机械组成。土壤机械组成不仅是土壤分类的重要诊断指标，也是影响土壤水、肥、气、热状况，物质迁移转化及土壤退化过程研究的重要因素，还是土壤地理研究、与农业生产相关的土壤改良、土建工程和区域水分循环过程等研究的重要内容。本数据集是基于2010-2018全国土系调查数据，采用地理加权回归、随机森林等数字土壤制图方法生成的中国1公里分辨率0-5cm的土壤砂粒含量数据，机械组成划分使用美国制标准（黏粒<0.002mm；粉粒0.05-0.002mm；砂粒0.05-2mm）；

The mineral constituents of natural soils are composed of soil particles of varying sizes. The relative proportion or mass fraction of each soil particle size class in the soil is defined as soil mechanical composition. Soil mechanical composition is not only an important diagnostic indicator for soil classification, but also a key factor influencing soil water, nutrient, gas and thermal regimes, as well as processes of material migration and transformation and soil degradation. Additionally, it is a core research topic for studies in soil geography, agricultural production-related soil improvement, civil engineering, and regional water cycle dynamics. This dataset provides 1-kilometer resolution soil sand content data at the 0-5 cm depth across China, generated using digital soil mapping methods such as geographically weighted regression (GWR) and random forest based on national soil series survey data collected from 2010 to 2018. The particle-size classification follows the U.S. system standards: clay (<0.002 mm); silt (0.05–0.002 mm); sand (0.05–2 mm).