土壤含水量对苜蓿和沙棘气孔导度与叶水势的影响

doi:10.16843/j.sswc.2019.02.005

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Abstract [Background] Medicago sativa and Hippophae rhamnoides are two of most important plants in the arid desert areas of northwest China. However, the mechanisms of water-saving and drought resistance of M. sativa and H. rhamnoides remain poorly understood, and the corresponding techniques need to be further studied.[Methods] The potted trials of water stress were carried out to understand the response mechanisms of stomatal conductance (G_s) and leaf water potential (ψ_L) to water stress for M. sativa and H. rhamnoides at seedling stage. Sufficient water supply (CK), light water stress (LD), moderate water stress (MD), and severe water stress (HD) were set up according to the percentages of soil water contents in field moisture capacity.[Results] Under different stress gradients, the diurnal variation of G_s and ψ_L for H. rhamnoides was similar with M-shaped and V-shaped curve, respectively, while the counterparts of M. sativa was different. The daily average G_s of H. rhamnoides was higher than that of M. sativa. And the average of G_s and ψ_L of two plants decreased with the increase of water stress. The correlation between G_s, ψ_L, and relative humidity (RH_L) were significantly positively correlated for two plants. The G_s of H. rhamnoides increased at first and then decreased with the increase of photosynthetic active radiation (PAR). The G_s of M. sativa increased with the increase of PAR only when sufficient water was supplied. However, there was no correlation between G_s and PAR under stress. The ψ_L and leaf temperature (T_L) of H. rhamnoides were significantly correlated with different water stress treatments, but not for M. sativa. The G_s and ψ_L of H. rhamnoides were 87%~203% higher than that of M. sativa with the change of RH_L, T_L, and PAR. Therefore, the response of H. rhamnoides to meteorological factors was more sensitive than M. sativa.[Conclusions] It is more adaptable for H. rhamnoides to drought stress environment, while the response mechanism of M. sativa to water stress is more complicated. This study will help to understand the mechanism of H. rhamnoides and M. sativa adapting to drought stress environment at seedling stage and provide a theoretical support for vegetation restoration in desert areas.

Key words： Medicago sativa Hippophae rhamnoides stomatal conductance leaf water potential response mechanism

Received: 20 June 2018

PACS:

Q945.79

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	CHEN Zhen
	YUAN Mutian
	CAO Qiqi
	LIU Tao
	XIAO Huijie

Cite this article:

CHEN Zhen,YUAN Mutian,CAO Qiqi, et al. Effects of soil water content on stomatal conductance and leaf water potential of Medicago sativa and Hippophae rhamnoides[J]. SSWC, 2019, 17(2): 37-43.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.02.005 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I2/37

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