青藏高原农业适宜性与分级图

本研究以青藏高原范围内土地资源为评价对象，阐明区域内适宜于农、林、牧业生产的现状及其后备土地资源数量、质量及其分布情况。通过实地调查，收集整理研究区域的相关数据，结合相关文献和专家经验确定评价因子（海拔、坡度、年降水量、积温、日照时数、土壤有效深度、质地、侵蚀强度、植被类型、NDVI）并对其分等定级和标准化，通过主成分分析法确定各评价因子的权重，采用加权指数和模型确定评价单元总分值，最后用ArcGis自然间断点分级法得出青藏高原宜农、宜林以及宜牧用地的适宜等级，输出90m分辨率的青藏高原农业适宜性图纸，并对结果校验分析。

This study takes land resources within the Qinghai-Tibet Plateau as the evaluation subject, aiming to clarify the current status of land suitable for agricultural, forestry and pastoral production, as well as the quantity, quality and spatial distribution of reserve land resources in the region. Relevant data of the study area were collected and compiled through field investigations. Combined with existing literature and expert experience, the evaluation factors including elevation, slope, annual precipitation, accumulated temperature, sunshine duration, soil effective depth, texture, erosion intensity, vegetation type and NDVI were identified, graded and standardized. The weights of each evaluation factor were determined via principal component analysis (PCA), and the total score of each evaluation unit was calculated using the weighted index sum model. Finally, the Jenks natural breaks classification method in ArcGIS was employed to derive the suitability grades of land suitable for agriculture, forestry and pastoral production on the Qinghai-Tibet Plateau. A 90-meter-resolution agricultural suitability map of the Qinghai-Tibet Plateau was generated, and the results were verified and analyzed.