Welcome to Journal of Agriculture,

Journal of Agriculture ›› 2023, Vol. 13 ›› Issue (8): 46-55.doi: 10.11923/j.issn.2095-4050.cjas2022-0112

Special Issue: 资源与环境 农业生态

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Impacts of Various Tree Species on Spatial Heterogeneity of Soil Dissolved Organic Carbon in Forest Ecosystems

KONG Lingqian1(), LIU Xianbin1,2(), LI Yun1   

  1. 1 School of Chemistry, Biology and Environment, Yuxi Normal University, Yuxi 653100, Yunnan, China
    2 Institute of Biology and Environmental Engineering, Yuxi Normal University, Yuxi 653100, Yunnan, China
  • Received:2022-08-09 Revised:2022-10-17 Online:2023-08-20 Published:2023-08-16

Abstract:

To investigate the contents of soil dissolved organic carbon and soil organic carbon in the rhizosphere of several tree species in different sampling places in a forest ecosystem, the factors affecting the spatial heterogeneity of soil dissolved organic carbon and soil organic carbon in forest ecosystem were analyzed. This project was carried out in the subtropical montane moist evergreen broad-leaved primary forest ecosystem in Ailao Mountains of Yunnan Province. Seven dominant tree species in the primary soil area of forest ecosystem with high altitude in three sampling watersheds were selected as the research objects to investigate the contents of soil dissolved organic carbon and soil organic carbon in the 0-10 cm topsoil. The results showed that the contents of soil dissolved organic carbon and soil organic carbon in the rhizosphere of 5 tree species, including Lithocarpus hancei (Bentham) Rehd., Castanopsis rufescens (Hook. f. et Thoms.) Huang et Y. T. Chang., Lithocarpus xylocarpus (Kurz) Markg., Symplocos ramosissima Wall. ex G. Don and Schima noronhae Reinw. ex Bl. Bijdr, were significantly higher than those in the rhizosphere of the other 2 shrub species, namely, Camellia forrestii (Diels) Coh. St. and Vaccinium duclouxii (Levl.) Hand.-Mazz.. Among the 5 tree species, the contents of soil dissolved organic carbon and soil organic carbon in the rhizosphere of L. hancei and S. noronhae were significantly higher than those of the other 3 species, indicating that different tree species could apparently affect the spatial heterogeneity of soil dissolved organic carbon and soil organic carbon. The contents of soil dissolved organic carbon and soil organic carbon as well as the proportion of soil dissolved organic carbon in soil organic carbon in the rhizosphere of the 7 sampling tree species respectively reached the maximum value in the Laojunshanshen watershed, and decreased to the corresponding lowest value in the Sankeshu watershed, indicating that the environmental factors in different sampling watersheds could also obviously affect the contents of soil dissolved organic carbon and soil organic carbon as well as the ratio between them. The research results of this project fully proved the complexity of the spatial distribution of soil dissolved organic carbon and soil organic carbon in forest ecosystems and the diversity of environmental controlling factors, and could provide new scopes for the research on soil organic carbon composition and carbon storage in various types of forest ecosystems in the world.

Key words: soil dissolved organic carbon, soil organic carbon, L. hancei, S. noronhae, C. rufescens, L. xylocarpus, S. ramosissima, subtropical montane moist evergreen broad-leaved forest in Ailao Mountains