干旱区生态环境知识资源中心(Arid): Vulnerability to drought-induced cavitation in shoots of two typical shrubs in the southern Mu Us Sandy Land, China

Arid

	Vulnerability to drought-induced cavitation in shoots of two typical shrubs in the southern Mu Us Sandy Land, China
	Li Yangyang; Chen Weiyue; Chen Jiacun; Shi Hui
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2016
卷号	8 期号:1 页码:125-137
英文摘要	Salix psammophila and Caragana korshinskii are two typical shrubs in the southern Mu Us Sandy Land of China which are threatened by increasing water deficits related to climate change and large-scale human activities (e.g. coal mining and oil exploitation). In this study, we assessed their vulnerability to xylem embolism and the related anatomical traits in two-year-old regenerated shoots of these two shrubs to understand how they cope with drought environment. We also evaluated the in situ hydraulic safety margins to hydraulic failure from measurements of annual predawn and midday leaf water potentials. The results showed that S. psammophila stems had a higher water transport capacity than C. korshinskii stems. The stem xylem water potentials at 12%, 50% and 88% loss of conductivity were -1.11, -1.63 and -2.15 MPa in S. psammophila, respectively, and -1.37, -2.64 and -3.91 MPa in C. korshinskii, respectively. This suggested that C. korshinskii was more resistant to cavitation than S. psammophila. Compared with S. psammophila, C. korshinskii had shorter maximum vessel length, lower vessel density, smaller conductive area and higher wood density, which may contribute to its more resistant xylem. The in situ hydraulic safety margins indicated that even during the driest periods, both shrubs lived well above the most critical embolism thresholds, and the hydraulic safety margin was wider in C. korshinskii than in S. psammophila, suggesting that the regenerated shoots of both shrubs could function normally and C. korshinskii had greater hydraulic protection. These results provide the basis for an in-depth understanding of the survival, growth and functional behavior of these two shrubs under harsh and dry desert environments.
英文关键词	Salix psammophila Caragana korshinskii hydraulic vulnerability xylem anatomy hydraulic safety margin
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Forestry
CSCD记录号	CSCD:5614060
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335597
作者单位	Li Yangyang, Northwest A&F University, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, Shanxi 712100, China.; Chen Weiyue, College of Forestry, Northwest A&F University, Yangling, Shanxi 712100, China.; Chen Jiacun, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shanxi 712100, China.; Shi Hui, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China.
推荐引用方式 GB/T 7714	Li Yangyang,Chen Weiyue,Chen Jiacun,et al. Vulnerability to drought-induced cavitation in shoots of two typical shrubs in the southern Mu Us Sandy Land, China[J],2016,8(1):125-137.
APA	Li Yangyang,Chen Weiyue,Chen Jiacun,&Shi Hui.(2016).Vulnerability to drought-induced cavitation in shoots of two typical shrubs in the southern Mu Us Sandy Land, China.Journal of Arid Land,8(1),125-137.
MLA	Li Yangyang,et al."Vulnerability to drought-induced cavitation in shoots of two typical shrubs in the southern Mu Us Sandy Land, China".Journal of Arid Land 8.1(2016):125-137.