安塞纸坊沟流域1:1土壤有机质含量分级图（1995年）

数据为安塞纸坊沟流域1:1土壤有机质含量分级图，是用土壤类型图为底图，在采样分析基础上，对土壤有机质含量的制图，比例尺为1:1万，时间为1995年。有机质含量分四级：<0.6%极少量，0.6%-1%少量，1%-2%偏少量，2%-3%中量。

The dataset is a soil organic matter content classification map of the Zhifanggou Watershed in Ansai County. It was developed using soil type maps as the base map, based on field sampling and laboratory analysis, with a scale of 1:10000 and completed in 1995. Soil organic matter content is categorized into four grades: <0.6% for extremely low content, 0.6%–1% for low content, 1%–2% for moderately low content, and 2%–3% for moderate content.