干旱区生态环境知识资源中心(Arid): Dew formation characteristics in the gravel desert ecosystem and its ecological roles on Reaumuria soongorica

Arid

DOI	10.1016/j.jhydrol.2021.126932
	Dew formation characteristics in the gravel desert ecosystem and its ecological roles on Reaumuria soongorica
	Zhuang, Yanli; Zhao, Wenzhi; Luo, Lihui; Wang, Lixin
通讯作者	Zhao, WZ (corresponding author), Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Linze Inland River Basin Res Stn, Lanzhou 730000, Peoples R China. ; Wang, LX (corresponding author), Indiana Univ Purdue Univ, Dept Earth Sci, Indianapolis, IN 46202 USA.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	603
英文摘要	As an additional source of water to plants besides rainfall, dew may have a positive impact on vegetation in the arid ecosystems. Knowledge regarding dew formation characteristics and its ecological effects on vegetation water status and photosynthetic performance in the gravel desert ecosystem is still lacking. In this study, the dew variability and formation frequency on a gravel desert were measured by microlysimeters. We quantified dew formation characteristics, investigated vegetation water response to dew events in the gravel desert ecosystem at the edge of a desert oasis, Northwestern China. The results showed water adsorption was a primary pathway of dew formation in such system, and the average daily amount of dew is 0.06 mm. Dew occurred on 36% of growing season days, the number of days with dew amounts >0.03 mm accounted for 82% of the total dew events, and the cumulative amount of dew for those days was 3.41 mm. Relative humidity, air temperature, wind speed, the difference between air temperature and soil surface temperature had significant effects on dew formation. A threshold of RH >= 30% is taken to mark possible condensation in the gravel desert ecosystem. A significant positive correlation between dew amounts and the relative moisture in the near-surface air was found when RH >= 30%. The moderate wind velocity (1-1.8 m/s) was favorable to dew formation, and when wind speed >5.47 m/s, there was no dew formation. Because of the water-absorbing scales on the leaves of Reaumuria soongorica, dew events significantly improved their relative water content, water potential, and photosynthetic performance in the early morning and ameliorating the adverse effects of plants exposed to prolonged drought. The study highlights dew is an important supplementary source of water in the gravel desert ecosystem. Although the absolute dew amounts were found not high, it can be a frequent and stable water resource. Furthermore, this study provides a comprehensive understanding of the effects of dew on plant water status in the gravel desert ecosystem.
英文关键词	Dew Ecohydrology Plant water status Super-xerophytic shrub Gravel desert ecosystem
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000706318300013
WOS关键词	NEGEV DESERT ; SEMIARID REGION ; WATER ; ABSORPTION ; URBAN ; PLANT ; PHOTOSYNTHESIS ; SIMULATION ; DEPOSITION ; DEWFALL
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363929
作者单位	[Zhuang, Yanli; Zhao, Wenzhi; Luo, Lihui] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Linze Inland River Basin Res Stn, Lanzhou 730000, Peoples R China; [Wang, Lixin] Indiana Univ Purdue Univ, Dept Earth Sci, Indianapolis, IN 46202 USA
推荐引用方式 GB/T 7714	Zhuang, Yanli,Zhao, Wenzhi,Luo, Lihui,et al. Dew formation characteristics in the gravel desert ecosystem and its ecological roles on Reaumuria soongorica[J],2021,603.
APA	Zhuang, Yanli,Zhao, Wenzhi,Luo, Lihui,&Wang, Lixin.(2021).Dew formation characteristics in the gravel desert ecosystem and its ecological roles on Reaumuria soongorica.JOURNAL OF HYDROLOGY,603.
MLA	Zhuang, Yanli,et al."Dew formation characteristics in the gravel desert ecosystem and its ecological roles on Reaumuria soongorica".JOURNAL OF HYDROLOGY 603(2021).