干旱区生态环境知识资源中心(Arid): Variation of water use efficiency across seasons and years: Different role of herbaceous plants in desert ecosystem

Arid

DOI	10.1016/j.scitotenv.2018.08.035
	Variation of water use efficiency across seasons and years: Different role of herbaceous plants in desert ecosystem
	Liu, Ran 1; Li, Yan1 ; Wang, Yugang 1; Ma, Jie 1; Cieraad, Ellen 2
通讯作者	Liu, Ran
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	647 页码:827-835
英文摘要	Desert ecosystems often structured in two distinct layers of woody and herbaceous plants. Changes in community composition alter the fractional coverage by bare soil, woody and herbaceous plants, with potential effects on water and carbon fluxes. We used eddy covariance measurements and chamber method in two similar shrub-dominated desert communities (Tamarix community and Haloxylon community) to assess inter-and intra-annual variations of ecosystem water use efficiency (EWUE) (where we distinguished whole ecosystem EWUE as EWUEE, and EWUE of shrub and herbaceous layers as EWUEShrub and EWUEHerb) in central Asia. In the Tamarix community, 11 years of carbon and water fluxes showed that years with larger herbaceous cover (referred to as shrub-herb years) had significant higher EWUEE than years with lower herbaceous cover (referred to as shrub years), with the values of 1.07 +/- 0.11 vs. 0.68 +/- 0.03 g C/kg H2O. There was a significant positive correlation between EWUEE and the maximum herbaceous plants cover. In the Haloxylon community, chamber measurements during a shrub year demonstrated that the shrub layer contributed most to the gross ecosystem productivity (GEP) and evapotranspiration (ET) of the system, with the herbaceous layer contributing around 30% at the beginning of the growing season, and decreasing to nearly zero during the middle and at the end of the growing season. The shrub layer EWUEShrub was significant higher than that in the herbaceous layer (EWUEHerb) throughout the growing season (1.82 +/- 0.11 vs. 1.06 +/- 0.32 g C/kg H2O). EWUEShrub was positively correlated with EWUEE, but there was no relationship between EWUEHerb and EWUEE in a shrub year. This study shows that the variability of the herbaceous layer across seasons and years in these desert ecosystems is crucial for predicting water and carbon cycling under ongoing and projected climatic change scenarios in shrub dominated desert ecosystems. (C) 2018 Elsevier B.V. All rights reserved.
英文关键词	Desert ecosystem Gross ecosystem productivity Evapotranspiration Ecosystem water use efficiency Vegetation components
类型	Article
语种	英语
国家	Peoples R China ; Netherlands
收录类别	SCI-E
WOS记录号	WOS:000447090400084
WOS关键词	NET ECOSYSTEM ; INTERANNUAL VARIABILITY ; SAVANNA ECOSYSTEM ; TROPICAL SAVANNA ; GAS-EXCHANGE ; CO2 EXCHANGE ; GRASSLAND ; VEGETATION ; WOODY ; PRODUCTIVITY
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218579
作者单位	1.Chinese Acad Sci, State Key Lab Desert & Oasis Ecol, Xinjiang Inst Ecol & Geog, 818 South Beijing Rd, Urumqi 830011, Xinjiang, Peoples R China; 2.Leiden Univ, Inst Environm Sci CML, Einsteinweg 2, NL-2333 CC Leiden, Netherlands
推荐引用方式 GB/T 7714	Liu, Ran,Li, Yan,Wang, Yugang,et al. Variation of water use efficiency across seasons and years: Different role of herbaceous plants in desert ecosystem[J]. 中国科学院新疆生态与地理研究所,2019,647:827-835.
APA	Liu, Ran,Li, Yan,Wang, Yugang,Ma, Jie,&Cieraad, Ellen.(2019).Variation of water use efficiency across seasons and years: Different role of herbaceous plants in desert ecosystem.SCIENCE OF THE TOTAL ENVIRONMENT,647,827-835.
MLA	Liu, Ran,et al."Variation of water use efficiency across seasons and years: Different role of herbaceous plants in desert ecosystem".SCIENCE OF THE TOTAL ENVIRONMENT 647(2019):827-835.