Biology and Pedology

Environmental response and modeling of stomatal conductance of apple trees on the Loess Plateau

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  • 1. College of Environment and Resource, Shanxi University, Taiyuan 030006, Shanxi,China
    2. Shaanxi Key Laboratory of Land Consolidation, Chang’an University, Xi’an 710064, Shaanxi,China
    3. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China

Received date: 2020-10-08

  Revised date: 2020-11-23

  Online published: 2021-04-14

Abstract

In this study, stomatal conductance (gs) was used to measure the exchange rate of water, CO2, and other substances between plants and the external environment. The observation and simulation of gs effectively indicated the exchange of substances and various physiological parameters. The Loess Plateau is typical of a temperate monsoon climatic zone in China and supports an agricultural area dominated by the cultivation of apple trees. In this study, an LI-6400 portable photosynthesis system was used to observe the physiological parameters of apple trees in situ on the Loess Plateau, the diurnal variation characteristics of their gs, and the relationships of these variables with environmental factors. The gs was simulated using the Jarvis model and the Ball-Woodrow-Berry (BWB) model. The results show that (1) the diurnal variation of gs in apple trees on the Loess Plateau showed a bimodal curve in August and September when temperatures were high and radiation was strong. The solar radiation increased gradually in the mornings (8:00—12:00), the stomata opened, and the first peak of gs appeared between 11:00 and 13:00. Around the noon hour (12:00—14:00), stimulated by the increase in temperature (Ta), the stomata of plants closed for a short period during the “midday depression of photosynthesis” to reduce water loss from plant cells. In the afternoon (14:00—18:00), as Ta and photosynthetically-active radiation (PAR) decreased, gs gradually increased, and a second peak appeared between 15:00 and 17:00. (2) Using the gray correlation degree, the correlation between gs and various environmental factors was as follows (in descending order): (PAR, 0.731)>CO2 concentration (Ca, 0.712)>vapor pressure deficit (VPD, 0.702)>Ta (0.689)>relative humidity (hs, 0.673). The response relationship between gs and the various environmental factors produced the following results: (1) it increased with increases in PAR, Ta, Ca, and hs and decreased with increases in VPD, and (2) The simulation of gs showed that the value of the determination coefficient (0.678), the modified coefficient of efficiency (0.335), and the modified index of agreement (0.803) were higher in the Jarvis model than in the BWB model (0.329, -1.630, 0.138), and the mean absolute error (0.103) was smaller than the error in the BWB model (0.143). Comparison of the simulation accuracy of multiple models showed that the Jarvis model had superior simulation accuracy. The results of the analysis of gs in response to environmental factors and its simulation in apple tree leaves on the Loess Plateau is important to understand how the demand for water by the leaves changes throughout the day. This knowledge can be used to improve the efficiency of water utilization and thus optimize the harvest. In the future, simulation studies of gs for a variety of crops grown in arid and semi-arid climatic conditions may benefit from the application of the Jarvis model in resource management.

Cite this article

MIAO Yu,GAO Guanlong,LI Wei . Environmental response and modeling of stomatal conductance of apple trees on the Loess Plateau[J]. Arid Land Geography, 2021 , 44(2) : 525 -533 . DOI: 10.12118/j.issn.1000–6060.2021.02.23

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