Sources of uncertainty in exploring rangeland phenology: A case study in an alpine meadow on the central Tibetan Plateau

CORC > 地理科学与资源研究所 > 中国科学院地理科学与资源研究所 > 生态系统研究网络观测与模拟重点实验室 > 生态网络实验室

	Sources of uncertainty in exploring rangeland phenology: A case study in an alpine meadow on the central Tibetan Plateau
	Zhao, GS; Shi, PL
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2017
卷号	14 期号:9 页码:1827-1838
关键词	Climate change Data quality NDVI Phenological exploration Northern Tibetan Plateau
ISSN号	1672-6316
英文摘要	Global climate change has been found to substantially influence the phenology of rangeland, especially on the Tibetan Plateau. However, there is considerable controversy about the trends and causes of rangeland phenology owing to different phenological exploration methods and lack of ground validation. Little is known about the uncertainty in the exploration accuracy of vegetation phenology. Therefore, in this study, we selected a typical alpine rangeland near Damxung national meteorological station as a case study on central Tibetan Plateau, and identified several important sources influencing phenology to better understand their effects on phenological exploration. We found man-made land use was not easily distinguished from natural rangelands, and therefore this may confound phenological response to climate change in the rangeland. Change trends of phenology explored by four methods were similar, but ratio threshold method (RTM) was more suitable for exploring vegetation phenology in terms of the beginning of growing season (BGS) and end of growing season (EGS). However, some adjustments are needed when RTM is used in extreme drought years. MODIS NDVI/EVI dataset was most suitable for exploring vegetation phenology of BGS and EGS. The discrimination capacities of vegetation phenology declined with decreasing resolution of remote sensing images from MODIS to GIMMS AVHRR datasets. Additionally, distinct trends of phenological change rates were indicated in different terrain conditions, with advance of growing season in high altitudes but delay of season in lower altitudes. Therefore, it was necessary to eliminate interference of complex terrain and man-made land use to ensure the representativeness of natural vegetation. Moreover, selecting the appropriate method to explore rangelands and fully considering the impact of topography are important to accurately analyze the effects of climate change on vegetation phenology.
学科主题	Environmental Sciences & Ecology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000409490000013
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/44013]
专题	生态系统网络观测与模拟院重点实验室_生态网络实验室
推荐引用方式 GB/T 7714	Zhao, GS,Shi, PL. Sources of uncertainty in exploring rangeland phenology: A case study in an alpine meadow on the central Tibetan Plateau[J]. JOURNAL OF MOUNTAIN SCIENCE,2017,14(9):1827-1838.
APA	Zhao, GS,&Shi, PL.(2017).Sources of uncertainty in exploring rangeland phenology: A case study in an alpine meadow on the central Tibetan Plateau.JOURNAL OF MOUNTAIN SCIENCE,14(9),1827-1838.
MLA	Zhao, GS,et al."Sources of uncertainty in exploring rangeland phenology: A case study in an alpine meadow on the central Tibetan Plateau".JOURNAL OF MOUNTAIN SCIENCE 14.9(2017):1827-1838.