干旱区研究

Arid Zone Research >

2021 , Vol. 38 >Issue 3: 794 - 801

DOI: https://doi.org/10.13866/j.azr.2021.03.21

Plant and Plant Physiology

Characteristics of Salix psammophila sap flow and its response to environmental factors in Mu Us Sandy Land

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  • 1. College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, Inner Mongolia, China
    2. Inner Mongolia Forestry Research Institute, Hohhot 010010, Inner Mongolia, China

Received date: 2020-12-09

  Revised date: 2021-02-26

  Online published: 2021-06-17

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Abstract

The sap flow pattern of Salix psammophila branches with different diameters was monitored long-term in the Mu Us Sand using a Flow32-1K wrapped heat balance sap flow meter. Additionally, the relationship between the sap flow of S. psammophila branches and the meteorological changes of the experimental plots was explored. With the increase in the diameter grade of branches, the diurnal variation of sap flow changed from a broad peak curve to an apparent single peak curve, and the sap flow rate showed an increasing trend. Weather conditions substantially influence sap flow, and the fluctuation of the sap flow rate on rainy days was severe, showing an obvious multi-peak curve. Otherwise, the change in the liquid flow rate on sunny days showed an evident bimodal curve. The mean sap flow rate on rainy days was lower than that on sunny days. With the increase in the diameter grade of branches, the difference of the cumulative sap flow rate between sunny days and rainy days gradually increased. Additionally, the sap flow rate showed a significant positive correlation with surface temperature, atmospheric temperature, saturated water vapor pressure, solar radiation, and wind speed, and it was negatively correlated with air relative humidity. On rainy days, saturated water vapor pressure and relative air humidity had a substantial influence on the sap flow rate. However, on sunny days, solar radiation was an important influence factor on sap flow rate. Based on the monitoring of the sap flow rate of branches and the transpiration consumption characteristics of the S. psammophila community, our study informs the rational utilization of water resources and the optimal control of community structure of S. psammophila.

Key words： Flow32-1K; Salix psammophila; sap flow; meteorological factors; Mu Us Sandy Land

Cite this article

HONG Guangyu,WANG Xiaojiang,LIU Guohou,ZHANG Lei,GAO Xiaowei,LI Zhuofan,LIU Tieshan,LIU Chenming,LI Zihao . Characteristics of Salix psammophila sap flow and its response to environmental factors in Mu Us Sandy Land[J]. Arid Zone Research, 2021 , 38(3) : 794 -801 . DOI: 10.13866/j.azr.2021.03.21

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