干旱区生态环境知识资源中心(Arid): Response of water-use efficiency to phenology in the natural forest and grassland of the Loess Plateau in China

Arid

DOI	10.1007/s11430-022-1124-0
	Response of water-use efficiency to phenology in the natural forest and grassland of the Loess Plateau in China
	Tan, Xingyan; Jia, Yangwen; Niu, Cunwen; Yang, Dawen; Lu, Wen; Hao, Chunfeng
通讯作者	Jia, YW
来源期刊	SCIENCE CHINA-EARTH SCIENCES
ISSN	1674-7313
EISSN	1869-1897
出版年	2023
卷号	66 期号:9 页码:2081-2096
英文摘要	Ecosystem water use efficiency (WUE) is an integrated physiological metric for the coupling cycle between terrestrial carbon, water, and energy. How WUE responds to vegetation phenology (e.g., SOS, EOS-start, end of growing season, and GSL-growing season length) shifting in temperate semi-arid regions is a hot spot in relative research fields. Based on remote-sensing products and in-situ measured climate data, this study discussed how gross primary productivity (GPP), evapotranspiration (ET), and WUE (quantified by GPP/ET) would change with the altering vegetation phenology and climate in the untouched semi-arid forests and grasslands of the Chinese Loess Plateau during 2001-2020. Our results show that vegetation tended to green-up earlier and brown-down later from 2001 to 2020, causing an extended GSL. The forests had an earlier SOS, later EOS, and longer GSL than the grasslands, but the latter had a bigger variation amplitude. The WUE in the study area decreased significantly during spring and summer, while the grassland WUE increased in autumn; the annual mean reduction rate in grassland WUE was approximately twice that of woodland. Earlier SOS could increase forest WUE but reduce grassland WUE in spring, mainly because leaf unfolding has a more pronounced limitation on soil evaporation beneath the forest canopy. EOS had less impact on WUE, and no apparent difference existed between these two ecosystems. Climate change could affect WUE directly by changing GPP and ET and indirectly by regulating vegetation phenology. Warming can increase GPP and ET, causing an earlier SOS, further promoting GPP and ET (except forest ET). Precipitation significantly affected forest GPP and ET in spring, grassland GPP and ET in summer, and grassland ET in autumn; precipitation affects spring grassland WUE mainly via regulating SOS. Enhanced solar radiation could suppress grassland GPP in spring, promote forest ET in autumn, and regulate grassland WUE by affecting phenology. This study is meaningful for improving the process-based vegetation model and studying arid and semi-arid ecosystems' responses to a changing climate.
英文关键词	Water use efficiency Vegetation phenology Climate change Remote sensing The Loess Plateau
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001050006800002
WOS关键词	CLIMATE-CHANGE ; ECOSYSTEM PRODUCTIVITY ; TERRESTRIAL ECOSYSTEMS ; SPRING PHENOLOGY ; CARBON-DIOXIDE ; TIME-SERIES ; VEGETATION ; EVAPOTRANSPIRATION ; PHOTOSYNTHESIS ; REDUCTION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398465
推荐引用方式 GB/T 7714	Tan, Xingyan,Jia, Yangwen,Niu, Cunwen,et al. Response of water-use efficiency to phenology in the natural forest and grassland of the Loess Plateau in China[J],2023,66(9):2081-2096.
APA	Tan, Xingyan,Jia, Yangwen,Niu, Cunwen,Yang, Dawen,Lu, Wen,&Hao, Chunfeng.(2023).Response of water-use efficiency to phenology in the natural forest and grassland of the Loess Plateau in China.SCIENCE CHINA-EARTH SCIENCES,66(9),2081-2096.
MLA	Tan, Xingyan,et al."Response of water-use efficiency to phenology in the natural forest and grassland of the Loess Plateau in China".SCIENCE CHINA-EARTH SCIENCES 66.9(2023):2081-2096.