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Image Credit: npj Heritage Science (2026)
Ancient Tomb Wood Study Reveals Hidden Patterns of Decay in Arid Environments
A new scientific study of wooden artefacts from a Tang Dynasty tomb in northwestern China is shedding light on how organic materials deteriorate in dry burial environments. By examining timber from the tomb of Murong Zhi in Gansu Province, researchers have identified clear patterns of decay that vary significantly from the outer surface to the interior of the wood.
The research focused on larch wood components used in the tomb’s structure, including door panels, coffin supports, and wooden figurines. Using a combination of physical, chemical, and microscopic analyses, the team investigated how environmental conditions influenced the preservation of these materials over time.
One of the study’s key findings is that deterioration is strongly concentrated near the surface of the wood. Outer layers show severe structural damage, including weakened cell walls, increased porosity, and deformation of microscopic features. In contrast, deeper layers remain relatively well preserved, retaining much of their original structure. This depth-dependent pattern of decay was consistently observed across multiple samples.
Measurements of density and moisture absorption further confirmed this gradient. Surface layers were found to be less dense and capable of absorbing more moisture, indicating greater degradation, while inner sections showed higher density and lower moisture uptake, reflecting better preservation.
Chemical analysis revealed additional changes associated with ageing. Outer layers exhibited significant loss of key wood components such as cellulose, alongside an increase in oxidation products. Meanwhile, the internal sections showed fewer chemical alterations, remaining closer in composition to fresh wood.
The study also highlights the role of environmental factors in shaping decay processes. In arid conditions, deterioration is driven mainly by non-biological mechanisms such as oxidation and the movement of soluble salts, rather than by microbial activity, which dominates in wetter environments.
By combining multiple analytical methods, the researchers were able to establish a clearer understanding of how degradation progresses within archaeological timber. These findings provide a valuable scientific basis for conservation strategies, particularly in determining how preservation treatments can effectively penetrate damaged wood and stabilize fragile artefacts.
Published on: 11-04-2026
Edited by: Abdulmnam Samakie
Source: npj Heritage Science