NDLI: Deepening Rooting Depths Improve Plant Water and Carbon Status of a Xeric Tree during Summer Drought

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Deepening Rooting Depths Improve Plant Water and Carbon Status of a Xeric Tree during Summer Drought

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Deepening Rooting Depths Improve Plant Water and Carbon Status of a Xeric Tree during Summer Drought

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Yan Li Xue Wu Xin-Jun Zheng Gui-Qing Xu
Abstract	Exploring the effects of drought on trees of different sizes is an important research topic because the size-dependent mortality pattern of the major dominant species significantly affects 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 different tree size with varying rooting depth, during summer drought. We measured predawn $(Ψ_{pd}$) and midday $(Ψ_{m}$) leaf water potential, osmotic potential at saturated turgor $(π_{100}$), and turgor lost point $(Ψ_{tlp}$), stomatal conductance $(g_{s}$) at noon, maximum photochemical efficiency 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. $Ψ_{pd}$, $g_{s}$ 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 $π_{100}$ and $Ψ_{tlp}$) 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.
e-ISSN	19994907
DOI	10.3390/f10070592
Journal	Forests
Issue Number	7
Volume Number	10
Language	English
Publisher	MDPI AG
Publisher Date	2019-01-01
Publisher Place	Switzerland
Access Restriction	Open
Subject Keyword	Plant Ecology Drought Tree Size Leaf Water Potential Root Depth Non-structural Carbohydrates
Content Type	Text
Resource Type	Article

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