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Volume 42 Issue 4
Nov.  2023
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ZHU Bailu, DENG Yan, XIE Yunqiu, KE Jing, WU Song, HUANG Jing, HOU Mengmeng. Service assessment of carbon storage of typical karst peak-cluster depressions in Guilin[J]. CARSOLOGICA SINICA, 2023, 42(4): 785-794. doi: 10.11932/karst20230413
Citation: ZHU Bailu, DENG Yan, XIE Yunqiu, KE Jing, WU Song, HUANG Jing, HOU Mengmeng. Service assessment of carbon storage of typical karst peak-cluster depressions in Guilin[J]. CARSOLOGICA SINICA, 2023, 42(4): 785-794. doi: 10.11932/karst20230413

Service assessment of carbon storage of typical karst peak-cluster depressions in Guilin

doi: 10.11932/karst20230413
  • Received Date: 2021-10-20
  • To reveal the impact of land use change on carbon storage under different development modes, this study took the karst peak-cluster depression in Xitang village, Xingping town, Yangshuo county, Guilin City as an example. Based on the field survey data in 2020, the study used InVEST model to evaluate the carbon storage of karst peak-cluster depression, and simulated the impact of vegetation types on carbon storage under two development scenarios (ecological protection model and economic development model).The study showed the following results, (1) The total carbon storage of the study area was 16,641.68 t with the carbon density of 221.30 t·hm−2. Its total economic value was 19.97 million yuan, and the economic value per unit area was 265,600 yuan·hm−2. The low value area was mainly concentrated in the north side of the hill slope, while the high value area was mainly distributed in the west and south side of the hill slope. (2) The proportions of the steep slope of natural forest, the gentle slope of natural forest and the gentle slope of economic forest to the total carbon storage of ecosystem were 51.96%, 16.04% and 10.44%, respectively. These three land types were the main sources of carbon storage. The carbon storage capacity per unit area of steep slopes of plantation and gentle slopes of natural forest was the strongest. (3) The amounts of carbon storage of artificial forest, natural forest and economic forest were 244.35 t, 12,215.17 t and 4,182.36 t, accounting for 1.47%, 73.40% and 25.13% of the total carbon storage of the ecosystem, respectively. Natural forest is the main carbon sink of the ecosystem. The carbon densities of artificial forest, natural forest and economic forest were 339.38 t·hm−2, 261.79 t/ha and 150.34 t·hm2, and the economic value per unit area was 407,200 yuan·hm−2, 314,200 yuan·hm−2, and 180,400 yuan·hm−2, respectively. Not only soil in natural forest and economic forest but also soil and above-ground vegetation in artificial forest are the largest carbon sink. (4) The carbon densities of soil, above-ground vegetation, underground vegetation and litter were 184.24 t·hm−2, 29.94 t·hm−2, 7.05 t·hm−2 and 0.06 t·hm−2, respectively. The proportion of soil carbon sink to ecosystem carbon sink was 83.25%, and soil carbon storage was the largest carbon pool in the ecosystem. Soil in both natural forest and economic forest is the largest carbon sink, and soil and above-ground vegetation in artificial forest have the largest carbon sink. (5) The carbon reserves of current situation, ecological protection mode and economic development mode were 19.9725 million yuan, 22.5214 million yuan and 15.9530 million yuan, respectively. Under the ecological protection mode, the natural forest and artificial forest increased by 8.74 hm2 and 4.78 hm2, respectively; the economic value of carbon storage increased by 2.5489 million yuan. Under the economic development mode, the area of economic forest increased by 45.99 hm2, and the economic value of carbon storage lost 4.0195 million yuan. The study indicates the impacts of different development modes on land use and carbon storage service function of karst ecosystem, which can provide reference for determining the future development mode of the core scenic area of Lijiang River Scenic Area in Guilin and the Karst World Natural Heritage Site in Guilin and the control of rocky desertification.

     

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