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Geoscience ›› 2024, Vol. 38 ›› Issue (03): 559-573.DOI: 10.19657/j.geoscience.1000-8527.2024.035

• Observation Simulation and Prediction Evaluation of Superbiotic Resources • Previous Articles     Next Articles

Spatial and Temporal Variability of Carbon Stocks in Different Land-use Types in the Yiluo River Basin in the Middle Section of the Yellow River from 1990 to 2050

YUAN Jianglong1,2,3(), LIU Xiaohuang1(), LI Hongyu1, XING Liyuan1, LUO Xinping1, WANG Ran1, WANG Chao1, ZHAO Honghui1   

  1. 1. Key Laboratory of Natural Resource Coupling Process and Effects, Beijing 100055, China
    2. College of Geography and Remote Sensing Science, Xinjiang University, Urumqi, Xinjiang 830017, China
    3. Urumqi Center of Natural Resources Comprehensive Survey, China Geological Survey, Urumqi, Xinjiang 830057, China
  • Online:2024-06-10 Published:2024-07-04

Abstract:

The change of land-use type is the key influence factor of regional carbon stocks, which significantly affects the whole terrestrial ecosystem. Taking the Yiluo River Basin in the middle section of the Yellow River as an study case, we assessed the spatial and temporal variations and influence factors of carbon stocks based on the Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) model during 1990—2020. We predicted the land-use types and carbon stock using the coupled PLUS model for the period of 2025-2050. A geoprobe was used to explore the regional carbon stock driving factor. The results show that (1) the land-use types in the Yiluo River Basin shifted to transferring-out with cropland and grassland, and transferring-in with forest land, water-body, and construction land. The regional carbon stock increased by 1.0×107 t from 1990 to 2020, with a continuous drop of carbon stock in the east and a continuous increase in the central and western areas. (2) The predicted overall regional carbon sequestration capacity decreases from 2025 to 2050. Comparing with the historical period, the carbon sequestration capacity in the east continues to decline and the carbon sequestration capacity in the central and western areas changes from a continuous increasing to a trend of overall increasing. the environmental restoration scenario is the most favorable to regional carbon sequestration, while the cultivated land protection scenario is the most unfavorable. (3) The geoprobe results indicate that the q-value (explanatory power) of Normalized Vegetation Index (NDVI) in the one-way analysis is 0.561, which has the strongest explanatory power. The q-value of Digital Elevation Model interacting with NDVI in the analysis is 0.592, showing a stronger explanatory power. It is recommended that the economic and agricultural development in the regions with a better economy and flat region (IV12-1) should emphasize the protection of nature. The regions with a better ecology and high altitude (VI22-1 and VI22-3) is recommended to mainly implement the ecological restoration strategy.

Key words: InVEST model, PLUS model, carbon stock, GeoDetector, Mann-Kendall’s test

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