干旱区生态环境知识资源中心(Arid): Root distribution of three dominant desert shrubs and their water uptake dynamics

Arid

	Root distribution of three dominant desert shrubs and their water uptake dynamics
	Xu Shiqin; Ji Xibin; Jin Bowen; Zhang Jinglin
来源期刊	Journal of Plant Ecology
ISSN	1752-9921
出版年	2017
卷号	10 期号:5 页码:780-790
英文摘要	Aims Root architecture is a crucial determinant in the water use of desert shrubs. However, lack of integrated research on the root functional type and water uptake dynamic hinders our current understanding of the water-use strategies of desert species. Methods A field experiment was conducted to investigate the root functional type of three dominant desert species, Haloxylon ammodendron, Nitraria tangutorum and Calligonum mongolicum, and the dynamics of their root water uptake. The stem sap flow and microclimate were monitored, and the intact root systems of these shrubs were excavated in their native habitats on the oasis-desert ecotone of northwestern China during the summer of 2014. Important Findings Based on root functional type, H. ammodendron is phreatophytic, while N. tangutorum and C. mongolicum are non-phreatophytic species, which means H. ammodendron can utilize multiple potential water sources, N. tangutorum and C. mongolicum mainly utilize shallow and middle soil water. The average root water uptake rates (RWU) of H. ammodendron, N. tangutorum and C. mongolicum were 0.56 (0.12), 1.18 (0.19) and 1.31 (0.30) kg m~(-2) h~(-1), respectively, during the experimental period; the contributions of night-time RWU to total water uptake amount for the corresponding species were 12.7, 2.9 and 10.6%, respectively. The diurnal and seasonal dynamics of RWU in the three species were significantly different (P < 0.05), and closely related to environmental variables, especially to photosynthetically active radiation and vapor pressure deficit. Our results suggested that the three species have distinct water-use patterns in combination with the patterns of root distribution, which may alleviate water competition during long-term water shortages. H. ammodendron appears to be more drought tolerant than the other species due to its use of multiple water sources and stable water uptake rates during growing season.
英文关键词	root architecture stem sap flow water-use strategy arid region desert shrub
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:6099221
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335867
作者单位	Xu Shiqin, College of Hydrology and Water Resources, Hohai University, State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing, Jiangsu 210098, China.; Ji Xibin, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Linze Inland River Basin Research Station, Key Laboratory of Inland River Ecohydrology, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Jin Bowen, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Linze Inland River Basin Research Station, Key Laboratory of Inland River Ecohydrology, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Zhang Jinglin, University of Chinese Academy of Sciences, Beijing 100049, China.
推荐引用方式 GB/T 7714	Xu Shiqin,Ji Xibin,Jin Bowen,et al. Root distribution of three dominant desert shrubs and their water uptake dynamics[J],2017,10(5):780-790.
APA	Xu Shiqin,Ji Xibin,Jin Bowen,&Zhang Jinglin.(2017).Root distribution of three dominant desert shrubs and their water uptake dynamics.Journal of Plant Ecology,10(5),780-790.
MLA	Xu Shiqin,et al."Root distribution of three dominant desert shrubs and their water uptake dynamics".Journal of Plant Ecology 10.5(2017):780-790.