干旱区生态环境知识资源中心(Arid): Deepening Rooting Depths Improve Plant Water and Carbon Status of a Xeric Tree during Summer Drought

Arid

DOI	10.3390/f10070592
	Deepening Rooting Depths Improve Plant Water and Carbon Status of a Xeric Tree during Summer Drought
	Zheng, Xin-Jun 1,2,3; Xu, Gui-Qing 1,2,3; Li, Yan4 ; Wu, Xue 2,3
通讯作者	Xu, Gui-Qing
来源期刊	FORESTS
EISSN	1999-4907
出版年	2019
卷号	10 期号:7
英文摘要	Exploring the e ff ects of drought on trees of di ff erent sizes is an important research topic because the size-dependent mortality pattern of the major dominant species significantly a ff ects the structure and function of plant communities. Here we studied the physiological performance and non-structural carbohydrates (NSCs) dynamics of a small xeric tree species, Haloxylon ammodendron (C. A. Mey.) of di ff erent tree size with varying rooting depth, during summer drought. We measured predawn (Y pd) and midday (Y m) leaf water potential, osmotic potential at saturated turgor ( 100), and turgor lost point (Y tlp), stomatal conductance (gs) at noon, maximum photochemical e ffi ciency of photosystem II (Fv /Fm) in the morning, and NSCs concentration, from June-September. Our results demonstrated that the summer drought reduces the overall performance of physiological traits of the small young trees more than the larger adult trees. Y pd, gs and Fv /Fm dropped larger in the small-diameter groups than the larger diameter groups. Substantial osmotic adjustments were observed in small size individuals (with lower 100 and Y tlp) to cope with summer drought. Furthermore, mean concentration of NSCs for the leaf and shoot were higher in September than in July in every basal stem diameter classes suggested the leaf and shoot acted as reserve for NSC. However the root NSCs concentrations within each basal stem diameter class exhibited less increase in September than in the July. At the same time, the small young tress had lower root NSCs concentrations than the larger adult tree in both July and September. The contrasting root NSC concentrations across the basal stem diameter classes indicated that the roots of smaller trees may be more vulnerable to carbon starvation under non-lethal summer drought. The significant positive relationship between rooting depth and physiological traits & root NSCs concentration emphasize the importance of rooting depth in determining the seasonal variation of water status, gas exchange and NSCs.
英文关键词	drought tree size leaf water potential root depth non-structural carbohydrates
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000482080800062
WOS关键词	AGE-RELATED-CHANGES ; CARBOHYDRATE DYNAMICS ; WOODY ANGIOSPERMS ; MORTALITY-RATES ; GROWTH ; SEEDLINGS ; RESPONSES ; DESERT ; ALLOCATION ; PHOTOSYNTHESIS
WOS类目	Forestry
WOS研究方向	Forestry
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/2XILL650/215702
作者单位	1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China; 2.Chinese Acad Sci, Fukang Stn Desert Ecol, Fukang 831505, Peoples R China; 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 4.Zhejiang A&F Univ, State Key Lab Subtrop Siviculture, 666 Wusu St, Hangzhou 311300, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Xin-Jun,Xu, Gui-Qing,Li, Yan,et al. Deepening Rooting Depths Improve Plant Water and Carbon Status of a Xeric Tree during Summer Drought[J]. 中国科学院新疆生态与地理研究所,2019,10(7).
APA	Zheng, Xin-Jun,Xu, Gui-Qing,Li, Yan,&Wu, Xue.(2019).Deepening Rooting Depths Improve Plant Water and Carbon Status of a Xeric Tree during Summer Drought.FORESTS,10(7).
MLA	Zheng, Xin-Jun,et al."Deepening Rooting Depths Improve Plant Water and Carbon Status of a Xeric Tree during Summer Drought".FORESTS 10.7(2019).