Phenological characteristics of alpine arid region based on biome type and its responses to climate factors: A case study of Qaidam Basin from 2000 to 2019
FU Yang,1,2, CHEN Hui,1, ZHANG Siqi1,3, YANG Yi4,5, ZHAO Yuanjie11. College of Resources and Environment Sciences, Hebei Normal University, Hebei Key Laboratory of Environmental Change and Ecological Construction, Shijiazhuang 050024, China 2. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China 3. College of Resources Science & Technology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China 4. Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China 5. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract Vegetation phenology reflects the adaptation of vegetation to the comprehensive environment. Phenology research is of great significance to understand the growth mechanism of vegetation in the ecosystem and its response to ecological factors, especially climate factors. Based on the MODIS NDVI data and Double Logistic Function fitting method, the vegetation phenology in the typical alpine arid region of Qaidam Basin from 2000 to 2019 was selected as the object. The characteristics of static state (spatial heterogeneity) and dynamics (temporal and spatial change) of vegetation phenology and their responses to climate change were studied at the regional and biome levels. The results are as follows. First of all, in Qaidam Basin, the start of growth season (SOS) and the end of growth season (EOS) were mainly advanced. Specifically, the start of growth season was 0.13 days/yr in advance and the end of growth season was 0.23 days/yr in advance. With regard to the end of growth season, 57% of the vegetation areas had a significant advance level (P<0.01). The length of growth season (LOS) was mainly shortened. The trend of shortening was 0.09 days/yr. Secondly, there was a positive correlation between the start of growth season and the end of growth season in spatial distribution and variation trend. In the region where the start of growth season occurred earlier, the end of growth season occurred earlier, and vice versa. The region where the variation trends of the start of growth season and the end of growth season were both in advance showed an obvious overlapping. The last but not the least, the combination of water and heat has obvious restrictive effect on vegetation phenology. No matter in distribution or variation trend of phenology, the start of growth season and the end of growth season were affected more significantly by precipitation, and the response of variation trend to precipitation was faster. Under the alpine arid condition, there was more precipitation in warm steppe and shrub, resulting in the longest growth season, 131 days and 128 days respectively. And the shortest growth season occurred in the alpine meadow (113 days). Keywords:alpine arid region;Qaidam Basin;vegetation phenology;biome type;climate change
PDF (5215KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 付阳, 陈辉, 张斯琦, 杨祎, 赵元杰. 基于群落类型的寒区旱区物候特征及其对气候因子的响应——以2000—2019年柴达木盆地为例. 地理研究[J], 2021, 40(1): 52-66 doi:10.11821/dlyj020200327 FU Yang, CHEN Hui, ZHANG Siqi, YANG Yi, ZHAO Yuanjie. Phenological characteristics of alpine arid region based on biome type and its responses to climate factors: A case study of Qaidam Basin from 2000 to 2019. Geographical Research[J], 2021, 40(1): 52-66 doi:10.11821/dlyj020200327
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