Spatial and temporal variation characteristics of vegetation greenness in rocky desertification and non-rocky desertification areas of Chongqing
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Affiliation:

College of Geography and Tourism,Chongqing Normal University

Clc Number:

S171.1

Fund Project:

Chongqing Natural Science(cstc2021jcyj-msxmX0616)

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    Abstract:

    The investigation of temporal and spatial variations in vegetation greenness and its response to different land use types in karst rocky desertification and non-rocky desertification areas in Chongqing is crucial for guiding ecological restoration efforts in karst regions. This study utilizes vegetation leaf area index (LAI) data and land use type information to conduct trend analysis and Hurest index calculations, aiming to analyze the temporal and spatial evolution characteristics of vegetation greenness in both rocky desertification and non-rocky desertification areas. Additionally, a land use transfer matrix is employed to quantitatively assess the impact of land use changes on vegetation greenness. The findings reveal that: (1) Vegetation greenness exhibits an increasing trend in both rocky desertification and non-rocky desertification areas, reaching maximum values of 1.36 and 1.69 respectively, with average annual growth rates of 0.014 and 0.012. (2) The dynamic changes observed in vegetation greenness within these areas demonstrate positive trends, with improvement trends accounting for 86.84% (rocky desertification)and87 .04%(non-rock ydesertificatio n). Furthermore, anti-continuous improvement trends are observed at rates of52 .82%(rock ydesertifi cation)a nd80 .29%(non-ro ckyde serti fication), indicating the primary change trajectory for future vegetation greenness. (3) The main land use types in both rocky and non-rocky desertification areas are woodland and cropland, and cropland converted from woodland is the main occurrence of degradation of vegetation greenness, while woodland converted from cropland, shrubs and grassland is the main occurrence of improvement of vegetation greenness. (4) The conversion of land use types with high Leaf Area Index (LAI) to those with low LAI resulted in a decrease in LAI and vegetation greenness, while the conversion from low LAI land use types to high LAI land use types led to an increase in LAI. In areas affected by stony desertification and non-stony desertification, the maximum reduction in total LAI transfer was 1.19×104 and 4,442.18 respectively, whereas the maximum increase was 1.50×104 and 1.71×104 respectively. The impact on total LAI from construction land, water area, and bare land area was minimal and not significant. These research findings contribute to understanding the change characteristics of vegetation greenness and its response mechanism towards land use changes in ecologically fragile areas. Furthermore, they provide a scientific basis for controlling rock desertification, ensuring ecological security, and promoting sustainable economic development in karst areas of Chongqing.

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History
  • Received:November 26,2023
  • Revised:January 23,2024
  • Adopted:January 24,2024
  • Online: April 29,2024
  • Published: