Transpiration of Reaumuria soongorica and Salsola passerine at Different Scales

doi:10.7522/j.issn.1000-694X.2017.00071

JOURNAL OF DESERT RESEARCH ›› 2018, Vol. 38 ›› Issue (2): 286-293.DOI: 10.7522/j.issn.1000-694X.2017.00071

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Transpiration of Reaumuria soongorica and Salsola passerine at Different Scales

Jin Yanxia^1,2, Wang Xinping¹, Zhang Yafeng¹, Pan Yanxia¹, Hu Rui¹, Xu Haojie^1,2, Shi Wei^1,2

1. Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-04-19 Revised:2017-08-28 Online:2018-03-20 Published:2018-03-20

Abstract

Abstract: The transpiration (T) characteristics of Reaumuria soongorica and Salsola passerine under drought and wet conditions were studied by LI-6400XT portable photosynthesis system combined with large lysimeter. The reliable determination method of leaf area of plant during switching of transpiration from leaf scale to shrub scale under non-destructive state was discussed in the study. The results showed that:it is feasible to obtain the leaf area of plant by image method under the condition of ensuring the normal growth of them. The transpiration obtained by switching from leaf scale to shrub scale based on the leaf area was higher consistency with lysimeter measurement (r=0.9752,P<0.01). Under the drought condition, transpiration rate diurnal changes of R. soongorica was unimodal and the main influencing factor was stomatal conductance (P<0.01). Under the wet condition, transpiration rate diurnal changes of R. soongorica and S. passerine were all unimodal and the main influencing factors were stomatal conductance, relative humidity, vapor pressure deficit and Photosynthetic radiation (P<0.01). In addittion, the water use efficiency and stomatic limitation of S. passerine were higher than that of R. soongorica. Moreover, the water use efficiency and stomatic limitation of R. soongorica under the drought condition were higher than those under the wet condition. The amount of shrub level transpiration measured by scale conversion and by weighing lysimeter were all indicated that the transpiration of R. soongorica was always greater than that of S. passerine at the leaf or shrub scale, and increased with the improvement of soil wetness. Under the drought condition, the ratio of transpiration to evapotranspiration (T/ET=21%) of R. soongorica was higher about 2% than that under the wet condition. Therefore, the leaf area parameters obtained by the image method can be used to study the conversion of plant transpiration from leaf (portable photosynthesis method) to plant and shrub level (lysimeter method).

Key words: Reaumuria soongorica, Salsola passerine, transpiration

CLC Number:

Q945.79

Jin Yanxia, Wang Xinping, Zhang Yafeng, Pan Yanxia, Hu Rui, Xu Haojie, Shi Wei. Transpiration of Reaumuria soongorica and Salsola passerine at Different Scales[J]. JOURNAL OF DESERT RESEARCH, 2018, 38(2): 286-293.

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Transpiration of Reaumuria soongorica and Salsola passerine at Different Scales

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