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FOREST RESOURCES WANAGEMENT ›› 2020›› Issue (6): 31-39.doi: 10.13466/j.cnki.lyzygl.2020.06.006

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Analysis of Forest Ecological Service Function Change and its Influencing Factors of the Three Gorges Reservoir Area in the Past 20 Years:a Case Study of Shizhu County

PU Ying1(), MU Yaojie2, SHAO Jing'an2   

  1. 1. Academy of Forest and Grassland Inventory and Planning,National Forestry and Grassland Administration,Beijing 100714,China
    2. Chongqing Normal University,Chongqing,400047,China
  • Received:2020-09-15 Revised:2020-11-03 Online:2020-12-28 Published:2021-01-26

Abstract:

Based on Shizhu County,located in the heart of the Three Gorges Reservoir Area,this paper uses the forest resources survey data in 2002,2012 and 2019 and the annual forest land change survey data,and uses the InVEST model to quantitatively evaluate and analyze the major service functions of forest ecosystem based on the evaluation results of using the gray correlation method to discuss the motivation factors that influence functional change of forest ecological service.The results show that:Between 2002 and 2019,the soil preservation,water conservation and water purification functions of the study area showed the higher of Fangdou Mountain and Qiyao Mountain,the lower spatial pattern of the river ridge flat dam area and the reservoir area of the Fangdou-Qiyao Mountain Range;Between 2002 and 2019,the function of forest ecological service changed significantly,the soil maintenance function increased by 155%,the water conservation function increased by 41%,and the water purification function increased by 47%;In the period 2002-2019,forest land took the lead in average soil retention,water conservation,N and P output,which played a decisive role in forest ecosystem services;Forest area is the main factor affecting soil retention,water conservation and water purification function.Natural forest protection projects and other forestry construction projects have made a great contribution to increase the forest area.Factors such as population growth,mobility and human activities can also have different effects on changes in service function.

Key words: forest ecosystem service function, forest land type, influencing factors, InVEST model, Three Gorges Reservoir Area

CLC Number: