新华社银川7月28日电（记者马思嘉、艾福梅）在位于中国西北的宁夏贺兰山中部银川段的洪积扇戈壁滩上，36岁的徐小龙和伙伴们头顶烈日、深 一脚浅一脚地踩着荒草碎石，仔细在石头上寻找着岩画。 "快看，这块石头上有个动物图案！"发现岩画后，这支银川市贺兰山岩画管理处的普查小组随即拍照、定位记录，后期进行数字化存档。徐小龙 说，这次田野调查工作自2020年启动，是对2000年至2003年普查工作结果的复查，将持续至2025年底。 1996年，贺兰山岩画被国务院公布为第四批全国重点文物保护单位，从此拉开岩画保护工作序幕。2002年，银川市贺兰山岩画管理处（后称"管理 处"）成立，2003年又颁布《银川市贺兰山岩画保护条例》——这是中国最早关于岩画保护的条例。 张建国见证并参与了贺兰山岩画保护工作全过程——持续多年野外调查摸清资源底数；修筑堤坝防止洪水破坏岩画；安装围栏、监控等保护设 施，并设置提醒标识，让游客意识到岩画的价值；制定保护规划，以平衡旅游发展与文物保护的矛盾…… 在绵延250公里的贺兰山上，分布着2万余幅远古先民们用石器、金属器或矿物质颜料创作的岩画，题材涉及人面像、动物、植物、手印、符号等 上百种自然物象图 ...

Core Points - The Helan Mountain rock paintings date back 3,000 to 10,000 years, reflecting the lifestyle and cultural symbols of ancient humans in northern China [1] - The establishment of the Yinchuan Helan Mountain Rock Painting Management Office in 2002 has led to various protective measures to preserve the rock paintings [1] Group 1 - The management office has implemented rescue protection projects, digital preservation, and monitoring systems to extend the lifespan of the rock paintings [1] - The site features over 100 surveillance cameras to monitor the condition of the rock paintings [6] - The use of drones for annual inspections and documentation of the rock paintings enhances the preservation efforts [3][5] Group 2 - The creation of electronic line drawings aids in the digital documentation of the rock paintings, facilitating future research [7] - A multi-source data management platform has been developed for high-precision scanning and modeling of the rock paintings [7] - The Yinchuan World Rock Art Museum serves as a research hub for studying the digital replicas of the Helan Mountain rock paintings [8]