Zha-xun is widely used in Tibetan medicine and is also an international traditional medicine. This study believes that the black organic matter constituting Zha-xun is mainly stored in the rocks. The exudation points of Zha-xun mostly distribute on the cliffs of high mountains, which makes it difficult to evaluate its resource distribution and storage area. This paper was aimed at the exudation environment of Tibetan medicine Zha-xun in Sichuan province and 6 ecological environmental factors of the Zha-xun were determined via the field investigation. Combining with these 6 factors as well as the GIS data of Sichuan province, ArcGIS software was used to extract ideal environmental factors which are suitable for exudation of Zha-xun, including geology types, geomorphological types, altitude, slope, vegetation types, and mean annual temperature. The spatial overlay analyses on the extracted environmental factors were carried out to predict the distribution area of Zha-xun in Sichuan province. Afterwards, field investigation was conducted to verify the prediction. The prediction showed that the exudation spots of Zha-xun in Sichuan province mainly located in 29 counties including 12 in Aba Prefecture, 15 in Ganzi Prefecture, and Muli County and Dechang County in Liangshan Prefecture. The deposit areas of Zha-xun were located in the Triassic, Devonian and Silurian strata and were basically distributed in 9 basins, including Dingqu River, Yalong River, Xianshui River, Dadu River, Suomo River, Minjiang River and Baishui River, characterized by a fragmented patch-like distribution along the mountain ranges, and the exudation spots of Zha-xun were mainly scattered among the rain-free cliffs' concavities of river valleys at a certain altitude. The prediction was consistent with the field investigation results, which suggested that it is possible and feasible to predict distribution of Zha-xun resources based on GIS-analysis. The study may provide a scientific basis for comprehensive investigations into Zha-xun's distribution and formation mechanism, thus promoting rational development and utilization of Zha-xun resources.

渣驯是常用大宗藏药和全世界广泛使用的国际传统药,该研究认为构成渣驯的黑色有机质主要储存于产地岩石中,由于渣驯出露点多在高山崖壁上,难于观测,导致难以评估其资源分布和蕴藏区域。该研究以四川省渣驯为研究对象,通过野外调查获得渣驯出露点的6个生态环境因子,结合四川省GIS数据,利用ArcGIS软件分别提取渣驯适宜的地质类型、地貌类型、高程、坡度、植被类型、平均温度因子,将各环境因子进行空间叠加分析,预测渣驯在四川省的空间分布范围,并结合野外调查数据进行验证。结果表明:①预测的四川省渣驯资源主要分布在阿坝藏族羌族自治州12个县,甘孜藏族自治州15个县,凉山彝族自治州2个县,共计29个县; ②渣驯出露点分布在一定海拔高度的河流沟谷的避雨悬崖上,蕴藏区主要位于在三叠纪、泥盆纪和志留纪地层中,呈破碎斑块状且沿山脉走势分布,主要分布在定曲河、雅砻江、鲜水河、大渡河、梭磨河、岷江及白水江等9个流域。通过GIS分析所得的渣驯分布预测范围与调查到的渣驯实际出露区基本吻合。说明采用GIS技术对渣驯进行环境因素分析以及空间分布预测是可行的,可为全面调查渣驯资源分布、形成机制分析以及对其进行合理开发利用提供科学依据。