RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2019, Vol. 28 >> Issue (08): 1977-1986.doi: 10.11870/cjlyzyyhj201908021

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Dynamics of Forest Ecosystem Services Before and After Dam Construction in the Three Gorges Reservoir Area

CHU Xin-lei, LI Le, ZENG Li-xiong, HUANG Zhi-lin, LIU Chang-fu, XIAO Wen-fa   

  1. (Key Laboratory of Forest Ecology and Environment, National Forestry and Grassland Administration, Research Institute 
    of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091)
  • Online:2019-08-20 Published:2019-08-19

Abstract: Based on the six issues of Landsat TM/ETM+/OLI image data, the dynamic variations of forestry ecosystem service values in Three Gorges Reservoir Area (TGRA) from 1990 to 2015 was analyzed by using the ecosystem service function evaluation specification and GIS spatial statistical method. The results showed that the forest area and forest coverage rate of the TGRA increased annually. The forest area growth rate was 71.04%, and the forest coverage rate increased from 31.27% to 53.48%. The structure of overall forest type was relatively stable, which was characterized by coniferous forest > mixed forest > shrub forest > broad-leaved forest. The value of forest ecosystem services in the TGRA showed an upward trend on a timescale, growth characterized by “quick, slow, quick”. The average forest ecosystem service value in the TRGA showed a local negative growth feature trend under the overall growth trend. Different types of forests had the value trend as that of the TRGA, which showed the variation characteristics of “increase, decrease, increase”. Contribution of different ecosystem service in the TGRA ranked as follows: water conservation> carbon fixation and oxygen released > biodiversity conservation > soil conservation> atmosphere environmental purification > nutrient accumulation > action of forest against natural calamities. From 1990 to 2015, the geographical distribution of forest ecosystem service of the TGRA was along the Wuxi - Wulong line in a spatial scale, which was higher in the southeast and lower in the northwest. From 1990 to 2015, the variation range of forest ecosystem service value of the TGRA had grown rapidly in west while slowly in east.

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