期刊
AGRICULTURAL AND FOREST METEOROLOGY
卷 151, 期 12, 页码 1711-1722出版社
ELSEVIER
DOI: 10.1016/j.agrformet.2011.07.003
关键词
Alpine grassland; Climate change; NDVI; Qinghai-Tibetan Plateau; Land surface phenology
资金
- Japan Science and Technology Agency
- Ministry of Education, China
- Center for Global Environmental Research of the National Institute for Environmental Studies, Japan
Spatial variations in phenological responses to temperature have not been reported for grasslands of the Qinghai-Tibetan Plateau. Using satellite-derived normalized difference vegetation index and meteorological records from 1982 to 2006, we characterized the spatial patterns of grassland green-up onset in relation to air temperature and precipitation before the growing season (preseason henceforth) in the central and eastern plateau by combining linear programming with correlation analysis. Green-up onset near half of the meteorological stations was significantly correlated (p < 0.10) with precipitation and thermal spring onset (TSO) date based on the cumulative temperature less than 6 weeks before the onset. The green-up onset paralleled the advance in TSO in the southwestern, southeastern, eastern, and northeastern parts of the plateau. The TSO and preseason precipitation (PPT) explained part of the inter-annual phenological variations, with r(2) varying between 0.05 and 0.55 and averaging 0.28, and did not explain delay of green-up onset in some areas. Increasing preseason temperature tended to advance green-up onset in relatively moist areas. PPT exerted a stronger influence on green-up onset in drier areas. These results indicate spatial differences in the key environmental influences on spring phenology. To improve the ability to predict onset, ground-based community-level phenological studies and spatial scaling-up of the phenology-climate relationship will be necessary. (C) 2011 Elsevier B.V. All rights reserved.
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