Journal of Yangtze River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (7): 22-26.DOI: 10.11988/ckyyb.20220214

• Water Resources • Previous Articles     Next Articles

Simulation on the Impact of Large-scale Eucalyptus Plantation on Runoff in Watershed

HUANG Feng-hua1,2,3,4, HUANG Ben-sheng1,2,3,4, HONG Chang-hong1,2,3,4, QIU Jing1,2,3,4   

  1. 1. Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510610,China;
    2. National and Local United Engineering Laboratory of Estuarine Water Technology, Guangzhou 510610,China;
    3. Guangdong Provincial Key Laboratory of Hydrodynamics Application, Guangzhou 510610, China;
    4. Guangdong Provincial Key Laboratory of Water Environment Treatment and Water Ecological Restoration, Guangzhou 510610,China
  • Received:2022-03-08 Revised:2022-06-15 Online:2023-07-01 Published:2023-07-12

Abstract: Eucalyptus is widely planted as an economic forest in the humid regions of southern China due to its fast growth rate, adaptability, and high economic benefits. However, the impact of large-scale eucalyptus plantations on water resource amout and floods has become a major concern. To examine this issue, a distributed hydrological model with physical mechanisms was constructed for the Liuxihe reservoir watershed in Guangdong Province. Scenario analysis method was applied to simulate the impact of land surface pattern under different eucalyptus plantation scenes on water resource amout in the watershed. The study found that large-scale eucalyptus plantation reduces annual water resource amout compared to common tree species such as natural mixed forest. For every additional 10 000 hectares of eucalyptus plantation, the annual water resource amout can be reduced by approximately 22 million m3. Although the impact on floods is less pronounced and the flood process under different eucalyptus planting scenes are basically the same, the flood peak flow changes are relatively significant. For every 10 000 hectares of eucalyptus plantation, the flood peak flow can be increased by approximately 10 m3/s. Overall, the large-scale planting of eucalyptus aggravates the loss of water resources, increases the peak flow of floods, and raises the risk of flood and drought disaster prevention.

Key words: eucalyptus plantation, water resources amount, flood scenario analysis, distributed hydrological model, Liuxihe reservoir basin

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