Simulating responses of leaf stomatal conductance to environmental factors for Tamarix ramosissma in an extreme arid region of China

doi:10.3724/SP.J.1258.2012.00483

Abstract

Abstract:

AimsStomata play a key role in plant adaptation to changing environmental conditions and environmental stress because they control both water losses and CO₂ uptake.
Methods Based on observation of leaf gas exchange parameters of Tamarix ramosissma in an extreme arid region in northwest of China, the relative humidity (h_s) (or vapor pressure deficit (D_s)) of the BWB and BBL model were evaluated by introducing diagnosis function f(H). After that, the results were imported into the Ye and Yu mechanism model for simulation of stomatal conductance (g_s) of T. ramosissma.
Important findings A significant difference was found for h_s (or D_s) of the BWB and BBL model with R² of 0.5354 and 0.1103, respectively, and the g_s is significantly related to h_s and D_s with a Gauss model with R² of 0.593 and 0.258, respectively. It suggests that the relationship between g_s and h_s is closer than D_s. Both the simplified model (referred to Simple model) proposed by Ye and Yu and its correction (referred to Gauss-h model) behaved well with R² of 0.8707 and 0.8286 and η of 0.1245 and 0.0171 (range from 0 to 1), respectively. The model validation shows that the Gauss-h model clearly underestimated the observations more than the Simple model, and the performance of the Simple model was significantly improved (R² of 0.9606) when the observed condition was close to the hypothesis of model infinitely.

Key words: BBL model, BWB model, mechanism model, stomatal conductance, Tamarix ramosissma

YU Teng-Fei, FENG Qi, SI Jian-Hua. Simulating responses of leaf stomatal conductance to environmental factors for Tamarix ramosissma in an extreme arid region of China[J]. Chin J Plant Ecol, 2012, 36(6): 483-490.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2012.00483

https://www.plant-ecology.com/EN/Y2012/V36/I6/483

Figures/Tables 5

Table 1 Model parameters and test results of the response of stomatal conductance to relative humidity (hs) and vapor pressure deficit (Ds)

模型 Model	气孔导度响应函数 f (H)	参数 Parameter			检验值 Test value
模型 Model	气孔导度响应函数 f (H)	α	β	n	r²	F	Sig.
BWB	f(H)=αh_s	0.26	--	81	0.535 4	517.16	0.000
BBL	f(H)= α/(1+D_s/β)	10.12	1.2	81	0.110 3	248.87	0.000

Fig. 1 Modelling results of the response function of stomatal conductance (f(H)) to relative humidity (hs) (A) and vapor pressure deficit (Ds) (B).

Fig. 2 Relationships between stomatic conductance (gs) and relative humidity (hs) (A) and vapor pressure deficit (Ds) (B) for Tamarix ramosissma.

Fig. 3 Comparison of Ball-Berry model and the amendments form of mechanism model. Ci, intercellular CO2 concentration; Cs, foliar CO2 concentration; f (H), response function of stomatal conductance; gs, stomatal conductance; hs, relative humidity; Pn, net photosynthetic rate。

Fig. 4 Validation and comparison of Simple model (A) and Gauss-h model (B).

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