Changes in vegetation phenology and its responses to climatic factors in the Mu Us Desert

Wang Xin; Liu Xinyue; Mu Yanmei; Liu Peng; Jia Xin

doi:10.12171/j.1000-1522.20220443

Journal of Beijing Forestry University > 2023 > 45(7): 61-75. > DOI: 10.12171/j.1000-1522.20220443

Wang Xin, Liu Xinyue, Mu Yanmei, Liu Peng, Jia Xin. Changes in vegetation phenology and its responses to climatic factors in the Mu Us Desert[J]. Journal of Beijing Forestry University, 2023, 45(7): 61-75. DOI: 10.12171/j.1000-1522.20220443

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Changes in vegetation phenology and its responses to climatic factors in the Mu Us Desert

Wang Xin^1,,
Liu Xinyue¹,
Mu Yanmei¹,
Liu Peng^{1, 2, 3},
Jia Xin^{1, 2, 3, ,}

1.
School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
2.
Yanchi Ecology Research Station of Mu Us Desert, Beijing 100083, China
3.
Key Laboratory for Soil and Water Conservation, National Forestry and Grassland Administration,Beijing Forestry University, Beijing 100083, China

More Information

Received Date: November 02, 2022
Revised Date: December 04, 2022
Available Online: June 19, 2023
Published Date: July 24, 2023

Graphical Abstract

Abstract

Abstract

Objective This study aimed to quantify the long-term trends and interannual variability (IAV) of vegetation phenology in the Mu Us Desert during 2001−2020, and to examine the phenological responses to climatic factors.
Method We extracted vegetation phenology from the normalized difference vegetation index (NDVI) timeseries, which was calculated from the MODIS MOD13Q1 product, using the dynamic threshold method in TIMESAT3.3. Extracted phenological indices included the start of growing season (SOS), the end of growing season (EOS), and the length of growing season (LOS). Partial correlation analysis was used to examine the relationships between phenological indices and climatic factors.
Result Multi-year mean phenological indices showed distinct spatial variations: average SOS was the (140 ± 15)th day of year (Julian day), displaying an advancing pattern from west to east and from north to south; average EOS was the (291 ± 6)th day of year, displaying a delaying pattern from north to south; and LOS averaged (151 ± 18) d, displaying an extending pattern from west to east and north to south. All phenological indices showed long-term trends during the study period: mean regional SOS across the Mu Us Desert showed an advancing trend (0.58 d/year); mean regional EOS showed a delaying trend (0.25 d/year); and LOS showed an extending trend (0.83 d/year). Temporal trends in phenological indices also showed significant spatial variations, weakening from west to east. The decadal trends and interannual variability of vegetation phenology (SOS and EOS) were influenced by the same set of climate factors: SOS was negatively correlated with the previous-month temperature and precipitation; while EOS was positively correlated with the temperature in the previous month and cumulative precipitation over the previous months.
Conclusion Significant longitudinal and latitudinal patterns are observed for SOS and LOS in the Mu Us Desert, and the temporal phenological trends are strengthened from east to west. The temporal trends of phenological indices are mainly reflected by advancing SOS and extending LOS. Advances in SOS and delays in EOS are mainly attributable to rising temperature in central and eastern Mu Us Desert, but are mainly explained by precipitation in the western regions with less precipitation.
- Mu Us Desert,
- vegetation phenology,
- long-term trend,
- interannual variability

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References (70)

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Changes in vegetation phenology and its responses to climatic factors in the Mu Us Desert