Responses of Leaf Stomatal Conductance and Gas Exchange of Haloxylon ammodendron to Typical Precipitation Event in the Hexi Corridor

Yang Qiyue; Zhao Wenzhi

doi:10.7522/j.issn.1000-694X.2013.00333

2014 , Vol. 34 >Issue 2: 419 - 425

DOI: https://doi.org/10.7522/j.issn.1000-694X.2013.00333

Responses of Leaf Stomatal Conductance and Gas Exchange of Haloxylon ammodendron to Typical Precipitation Event in the Hexi Corridor

Yang Qiyue ,
Zhao Wenzhi

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1. Linze Inland River Basin Research Station/Key Laboratory of Inland River Ecohydrology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2013-11-13

Revised date: 2014-02-24

Online published: 2014-03-20

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Abstract

C₄ plants have strong ability to use limited precipitation in desert environment due to higher water use efficiency, but it is not understanding of stomatal behavior and gas exchange response to precipitation thoroughly. Here the responses of leaf stomatal conductance (G_s) and gas exchange (P_n) of 6-7 year-old Haloxylon ammodendron in desert-sand to seven rainfall treatments (±30%, ±20%, ±10%, CK) which were applied by rainfall manipulative experiments were evaluated. The results showed that the supply of 6-12 mm rainfalls to soil moisture concentrated within 50 cm soil depths. G_s and P_n increased by 9.17% and 4.17% with the increase of precipitation by 10%, respectively. G_s and P_n showed a trend of unimodality which increased to a peak value at 1d after precipitation and then decreases. Both were correlated significantly to Soil moisture content (SVWC), Air relative humidity (RH) and Vapor pressure deficit (VPD). Leaf gas exchange was mainly affected by stomatal factors when predawn leaf water potential of H. ammodendron between -2.08 MPa and -2.74 MPa after precipitation, while by non- stomatal factors when predawn leaf water potential dropped to below -3.16 MPa.

Key words： Hexi Corridor; Haloxylon ammodendron; C₄ plants; stomatal conductance; net photosynthetic rate

Cite this article

Yang Qiyue , Zhao Wenzhi . Responses of Leaf Stomatal Conductance and Gas Exchange of Haloxylon ammodendron to Typical Precipitation Event in the Hexi Corridor[J]. Journal of Desert Research, 2014 , 34(2) : 419 -425 . DOI: 10.7522/j.issn.1000-694X.2013.00333

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