Original ResearchPublished 8 September 2026Accounting for terrain in neighborhood competition: fused UAV and backpack LiDAR for fine-scale volume estimation in Chinese fir (Cunninghamia lanceolata) plantationsTianhui Xu · Dandan Li · Fan Wang · Yuman Sun · Honggang SunFrontiers in Forests and Global Changedoi 10.3389/ffgc.2026.1894535