The Dynamic Simulation of Water Use Efficiency in Apple Tree Canopy

Chinese Agricultural Science Bulletin ›› 2014, Vol. 30 ›› Issue (22) : 135-139. DOI: 10.11924/j.issn.1000-6850.2014-0368
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The Dynamic Simulation of Water Use Efficiency in Apple Tree Canopy

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Abstract

A coupled model of photosynthetic rate (Pn) and transpiration rate (Tr) was developed to simulate the three-dimensional distribution of leaf instantaneous water use efficiency (WUEI) in apple canopy. For convenience, WUEI was expressed as the ratio of net Pn to Tr. The experiment was conducted in a ‘Fuji’ apple (Malus domestica Borkh. cv. ‘Fuji’) orchard during the 2011~2012 growing seasons. The simulation was shown that WUEI increased rapidly with increasing CO2 concentration and relative humidity (RH); but decreased with increasing temperature and leaf water potential (Ψl). The diurnal course of WUEI in the canopy showed a double-peak curve on clear day. The average WUEI on clear days was 2.98 mmol?mol-1 which was about 42% higher than cloudy days. The study indicated that the sensitivity of WUEI to microclimatic factors and Ψl can be systemically assessed by the coupled model.

Key words

apple; water use efficiency; 3-dimensional canopy; simulation; photosynthesis; transpiration

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The Dynamic Simulation of Water Use Efficiency in Apple Tree Canopy. Chinese Agricultural Science Bulletin. 2014, 30(22): 135-139 https://doi.org/10.11924/j.issn.1000-6850.2014-0368

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