干旱区生态环境知识资源中心(Arid): Estimating the peak of growing season (POS) of China's terrestrial ecosystems

Arid

DOI	10.1016/j.agrformet.2019.107639
	Estimating the peak of growing season (POS) of China's terrestrial ecosystems
	Wang, Xiaoyue 1; Wu, Chaoyang 1,2
通讯作者	Wu, Chaoyang
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2019
卷号	278
英文摘要	Vegetation phenology is a sensitive indicator of climate change and has substantial impacts on ecosystem carbon uptake. Previous studies have revealed the importance of the start and end of growing season and investigated their dynamics with climate change. However, the interannual variability of the peak of growing season (POS), which also plays a crucial role in carbon cycle of terrestrial ecosystems, has not been well documented. Here, we used field observations from regional flux measurements to evaluate four methods in POS extraction based on time series of satellite observed normalized difference vegetation index (NDVI). Results showed that the combination of Savitzky-Golay filter and cubic spline (SG-cubic spline) method had overall higher accuracy (R-2=0.77, RMSE=8.3 days) than current approaches for POS detection. We then analyzed the spatial and temporal patterns of POS in China during 1982-2015 and found an overall advanced trend of POS in most regions, but variations were also observed among biomes. Preseason temperature was the most important factor controlling POS for about 25.6% of all pixels, followed by radiation (19.7%) and precipitation (14.6%), respectively. A higher temperature overall advanced POS, while influences of precipitation and radiation were highly biome-dependent. We further investigated the impacts of POS on plant productivity and found that an advanced POS would increase annual GPP, but this relationship was opposite in arid regions, highlighting the role of soil moisture in dry areas. Our study is meaningful for deepening the understanding between phenology and carbon cycling with respect to future climate change.
英文关键词	Peak of growing season SG-cubic spline Climate control GPP
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000500196400004
WOS关键词	CLIMATE-CHANGE ; VEGETATION PHENOLOGY ; NORTHERN-HEMISPHERE ; AUTUMN PHENOLOGY ; TIBETAN PLATEAU ; GREEN-UP ; FEEDBACKS ; IMPACTS ; PRECIPITATION ; CO2
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
EI主题词	2019-11-15
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310899
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xiaoyue,Wu, Chaoyang. Estimating the peak of growing season (POS) of China's terrestrial ecosystems[J]. 中国科学院地理科学与资源研究所,2019,278.
APA	Wang, Xiaoyue,&Wu, Chaoyang.(2019).Estimating the peak of growing season (POS) of China's terrestrial ecosystems.AGRICULTURAL AND FOREST METEOROLOGY,278.
MLA	Wang, Xiaoyue,et al."Estimating the peak of growing season (POS) of China's terrestrial ecosystems".AGRICULTURAL AND FOREST METEOROLOGY 278(2019).