Predicting soil cadmium spatial distribution with HDXRF coupling to multi-model machine learning in the karst area. - Gu, Zichen; Liu, Hongyan; Mei, Xue; Wu, Longhua; Rasool, Ghulam; Li, Xuexian; Chen, Yonglin; Zhang, Hai; Li, Chunyan; Song, Wei (Environmental Monitoring & Assessment, 2026)