干旱区生态环境知识资源中心(Arid): Stable isotopes reveal varying water sources of Caragana microphylla in a desert-oasis ecotone near the Badain Jaran Desert

Arid

DOI	10.3724/SP.J.1226.2018.00458
	Stable isotopes reveal varying water sources of Caragana microphylla in a desert-oasis ecotone near the Badain Jaran Desert
	Zhou, Hai; Zhao, WenZhi; He, ZhiBin; Ren, Heng
通讯作者	Zhao, WZ
来源期刊	SCIENCES IN COLD AND ARID REGIONS
ISSN	1674-3822
出版年	2018
卷号	10 期号:6 页码:458-467
英文摘要	Understanding the variation in a plant's water sources is critical to understanding hydrological processes in water-limited environments. Here, we measured the stable-isotope ratios (delta O-18) of xylem water of Caragana microphylla, precipitation, soil water from different depths, and groundwater to quantitatively analyze the proportion of water sources for the shrub. We found that the water sources of C. microphylla differed with the plant's ages and the seasons. The main water source for young shrubs was upper-soil water, and it showed significant changes with seasonal precipitation inputs. In summer, the proportion contributed by shallow water was significantly increased with increased precipitation inputs. Then, the contribution from shallow-soil water decreased with the decline in precipitation input in spring and autumn. However, the adult shrubs resorted to deep-soil layers and groundwater as the main water sources during the whole growing season and showed much less seasonal variation. We conclude that the main water source of the young shrubs was upper-soil water and was controlled by precipitation inputs. However, once the shrub gradually grew up and the roots reached sufficient depth, the main water sources change from the upper-soil layer recharged by precipitation to deep-soil water and groundwater, which were relatively stable and abundant in the desert ecosystem. These results also suggest that desert shrubs may be able to switch their main water sources to deep and reliable water sources as their age increases, and this adjustment to water availability carries significant importance for their acclimation to the desert habitat.
英文关键词	water-use pattern oxygen stable isotope water sources Caragana microphylla
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000457535700002
WOS关键词	SOIL-WATER ; ROOT SYSTEMS ; PRECIPITATION ; PLANTS ; OXYGEN ; PATTERNS ; CHINA ; ECOSYSTEMS ; STRATEGIES ; RESPONSES
WOS类目	Geography, Physical
WOS研究方向	Physical Geography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/333277
作者单位	[Zhou, Hai; Zhao, WenZhi; He, ZhiBin; Ren, Heng] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Linze Inland River Basin Res Stn, Key Lab Ecohydrol Inland River Basin, 320 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China; [Ren, Heng] Chinese Acad Sci, Lanzhou Informat Ctr, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Hai,Zhao, WenZhi,He, ZhiBin,et al. Stable isotopes reveal varying water sources of Caragana microphylla in a desert-oasis ecotone near the Badain Jaran Desert[J],2018,10(6):458-467.
APA	Zhou, Hai,Zhao, WenZhi,He, ZhiBin,&Ren, Heng.(2018).Stable isotopes reveal varying water sources of Caragana microphylla in a desert-oasis ecotone near the Badain Jaran Desert.SCIENCES IN COLD AND ARID REGIONS,10(6),458-467.
MLA	Zhou, Hai,et al."Stable isotopes reveal varying water sources of Caragana microphylla in a desert-oasis ecotone near the Badain Jaran Desert".SCIENCES IN COLD AND ARID REGIONS 10.6(2018):458-467.