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	Modeling the water use efficiency of soybean and maize plants under environmental stresses: application of a synthetic model of photosynthesis-transpiration based on stomatal behavior
	Yu G. R. ; Wang Q. F. ; Zhuang J.
	2004
关键词	environmental stresses maize (Zea mays L.) soybean (Glycine max Merr.) water use efficiency (WUE) gas-exchange co2 leaves assimilation formulation temperature conductance light field
英文摘要	Understanding the variability of plant WUE and its control mechanism can promote the comprehension to the coupling relationship of water and carbon cycle in terrestrial ecosystem, which is the foundation for developing water-carbon coupling cycle model. In this paper, we made clear the differences of net assimilation rate, transpiration rate, and WUE between the two species by comparing the experiment data of soybean (Glycine max Merr.) and maize (Zea mays L.) plants under water and soil nutrient stresses, WUE of maize was about two and a half times more than that of soybean in the same weather conditions. Enhancement of water stresses led to the marked decrease of A(m) and E-m of two species, but water stresses of some degree could improve WUE, and this effect was more obvious for soybean. WUE of the two species changed with Psi(L) in a second-order curve relation, and the WUE at high fertilization was higher than that at low fertilization, this effect was especially obvious for maize. Moreover, according to the synthetic model of photosynthesis-transpiration based on stomatal behavior (SMPTSB) presented by Yu et al. (2001), the WUE model and its applicability were discussed with the data measured in this experiment. The WUE estimated by means of the model accorded well with the measured values. However, this model underestimated the WUE for maize slightly, thus further improvement on the original model was made in this study. Finally, by discussing some physiological factors controlling A(m) and WUE, we made clear the physiological explanation for differences of the relative contributions of stomata- and mesophyll processes to control of A(m) and WUE, and the applicability of WUE model between the two species. Because the requirement to stomatal conductance by unit change of net assimilation rate is different, the responses of opening-closing activity of stomata to environmental stresses are different between the two species. To obtain the same level of net assimilation rate, soybean has to open its stomata more widely to keep small stomatal resistance, as compared with maize.
出处	Journal of Plant Physiology
卷	161
期	3
页	303-318
收录类别	SCI
语种	英语
ISSN号	0176-1617
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22518]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Yu G. R.,Wang Q. F.,Zhuang J.. Modeling the water use efficiency of soybean and maize plants under environmental stresses: application of a synthetic model of photosynthesis-transpiration based on stomatal behavior. 2004.

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