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Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (3): 313-325.DOI: 10.7522/j.issn.1000-694X.2025.00046

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Effects of sand dune burial on the litter decomposition of desert plant branches

Yanyan Yang1(), Lianyou Liu2, Bo Wu1, Yingjun Pang1   

  1. 1.Key Laboratory of Desert Ecosystem and Global Change,National Forestry and Grassland Administration,Institute of Ecological Conservation and Restoration,Chinese Academy of Forestry,Beijing 100091,China
    2.Faculty of Geographic Science,Beijing Normal University,Beijing 100875,China
  • Received:2025-03-31 Revised:2025-05-11 Online:2025-05-20 Published:2025-06-30

Abstract:

Movement of sand dunes along wind directions can cause mortality of desert plants which are central to desert ecosystems. Currently, little is known about the decomposition of plant litter after death under dune burial conditions. In this paper, we investigated the relationship between the duration of dune burial on desert plants (Nitraria tangutorum and Caragana microphylla) and dune parameters of morphology and movement, as well as the decomposition characteristics of desert plants under dune burial by various methods, including remote sensing measurements, sample collection and experimental analysis. The results showed that: (1) The duration of sand dune burial on desert plants was positively and significantly correlated with its morphological parameters and negatively and obviously correlated with its movement speed in power functions, and the larger the dune volume or scale was, the longer the burial time of the plants was. (2) The mass loss rate of the buried desert plants was positively correlated with the duration of sand dune burial in a significant logarithmic function. In the first 25 years of dune compaction and burial, the decomposition rate was greater, and the annual average quality loss rate is 2.6%, after which the decomposition rate leveled off. The decomposition rate of Caragana microphylla branche litters was greater than that of Nitraria tangutorum during the period of dune compaction and burial. The decomposition rate of desert plant branch litters increased with the increase of diameter. (3) Dune burial could lead to the enrichment of organic C and N in the plant branch litters, and the enrichment degree increased with the increase of the duration of sand dune burial. And the enrichment degree of N was higher than that of organic C, but showed a decrease with the increase of the duration of sand dune burial. The results of this study will provide a scientific basis for the accurate prediction of the carbon turnover rate of desert plants in arid areas.

Key words: sand dune burial, desert plants, decomposition of plant litters, mass loss, nutrient release

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