气候变化领域集成服务门户(CCPortal): Vegetation Phenological Differences Between Polar- and Equatorial-Facing Slopes in the Three Rivers Source Region, Tibetan Plateau

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DOI	10.1029/2023GL107316
	Vegetation Phenological Differences Between Polar- and Equatorial-Facing Slopes in the Three Rivers Source Region, Tibetan Plateau
	Ma, Dujuan; Xie, Jiangliu; Wang, Changjing; Chen, Rui; Wu, Xiaodan; Wang, Cong; Xie, Qiaoyun; Yin, Gaofei
发表日期	2024
ISSN	0094-8276
EISSN	1944-8007
起始页码	51
结束页码	5
卷号	51 期号:5
英文摘要	Vegetation growth is influenced by the microclimate driven by aspects, as evident in the asymmetric vegetation greenness on polar-facing slopes (PFS) and equatorial-facing slopes (EFS). However, it remains uncertain whether aspects influence vegetation phenology. To address this question, we defined the aspect-induced phenological differences between PFS and EFS from 2019 to 2022 within each 3 x 3 km2 grid, using average phenological metrics extracted from Sentinel-2 data. We found that the start of the growing season (SOS) occurs earlier on EFS in cold and humid regions, but in arid areas, PFS has an earlier SOS. The end of the growing season (EOS) consistently occurred later on EFS due to radiation limitations in autumn phenology. Employing the space-for-time approach, the observed distribution of phenological differences within the climate space could potentially indicate the phenological trends of different slope orientations in the future. Our study provides valuable insights into topographic regulation on vegetation phenology. Equatorial-facing slopes (EFS) receive more solar radiation than polar-facing slopes (PFS), resulting in contrasting microclimate conditions. Specifically, EFS are warmer and drier, while PFS are colder and wetter. These microclimate differences contribute to variations in vegetation greenness between PFS and EFS. Based on this, we hypothesized that the phenology of grassland in the Three Rivers Source Region on the Tibetan Plateau is influenced by aspects. To test this hypothesis, we calculated the phenological differences between PFS and EFS within each 3 x 3 km2 grid using average phenological metrics derived from Sentinel-2. Our findings reveal that, for the start of the growing season (SOS), EFS exhibited an earlier onset in regions with low temperature and high precipitation, whereas for regions with high temperature, the growing season starts earlier on PFS. In contrast, over 70% of the grassland area on EFS experiences a later end of the growing season (EOS) due to radiation being a major limiting factor of autumn phenology. In addition, we utilized the space-for-time approach to project potential future phenological changes on PFS and EFS. Our study enhances comprehension of vegetation ecological management and carbon sequestration in mountainous areas. There are significant phenological differences between polar-facing slopes and equatorial-facing slopes Phenological differences vary under different background climatic conditions Using the space-for-time approach, the phenological differences in climate space suggest future phenological shifts
英文关键词	microclimate; phenology; aspects; climate
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001175157100001
来源期刊	GEOPHYSICAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306067
作者单位	Southwest Jiaotong University; Central China Normal University; University of Western Australia
推荐引用方式 GB/T 7714	Ma, Dujuan,Xie, Jiangliu,Wang, Changjing,et al. Vegetation Phenological Differences Between Polar- and Equatorial-Facing Slopes in the Three Rivers Source Region, Tibetan Plateau[J],2024,51(5).
APA	Ma, Dujuan.,Xie, Jiangliu.,Wang, Changjing.,Chen, Rui.,Wu, Xiaodan.,...&Yin, Gaofei.(2024).Vegetation Phenological Differences Between Polar- and Equatorial-Facing Slopes in the Three Rivers Source Region, Tibetan Plateau.GEOPHYSICAL RESEARCH LETTERS,51(5).
MLA	Ma, Dujuan,et al."Vegetation Phenological Differences Between Polar- and Equatorial-Facing Slopes in the Three Rivers Source Region, Tibetan Plateau".GEOPHYSICAL RESEARCH LETTERS 51.5(2024).