Sap Flow Characteristics of Different Diameter Classes of Salix psammophila and Its Response to Environmental Factors

doi:10.13304/j.nykjdb.2023.0818

Abstract

Abstract:

To explore the sap flow characteristics of Salix psammophila with different diameter classes and its relationship with environmental factors， the sap flow rate of Salix psammophila was continuously monitored by plant sap flow meter （EMS62）， and the meteorological factors and soil factors were monitored simultaneously by small weather station （HOBO U30） and water potential sensor （TEROS 21）. The results showed that the diurnal variation of sap flow rate at each diameter class showed a ‘single peak’ curve. With the change of time， the flow rate of >10 mm diameter class increased first and then decreased， while the flow rate of ≤10 mm diameter class decreased continuously， and the start-up and end time of flow were different. The sap flow rate of Salix psammophila in sunny day was higher than that in rainy day. The change of sap flow in sunny days showed ‘single peak’ curve， and the change of sap flow in rainy days showed ‘single peak’ or ‘double peak’. Solar radiation was the primary factor affecting the change of Salix psammophila sap flow. With the expansion of time scale， the interpretation rate of sap flow change decreases， while the number of affected factors increased. In conclusion， during the growing season， the sap flow of Salix psammophila increased with the increase of diameter class， but there were differences in the sap flow changes of different diameter classes.

Key words: Salix psammophila, environmental factor, different diameter classes, sap flow

摘要：

为探究不同径级沙柳（Salix psammophila）的液流特征及其与环境因子的关系，采用植物液流仪（EMS62）对沙柳液流速率进行持续监测，同步采用小型气象站（HOBO U30）和水势传感器（TEROS 21）监测气象因子及土壤因子。结果表明，各径级沙柳液流速率的日变化均呈“单峰”型曲线。随着时间变化，>10 mm径级沙柳的液流速率呈先升后降趋势，≤10 mm径级沙柳的液流速率呈下降趋势，且液流启动与结束时间存在差异。晴天时沙柳的液流速率大于阴天，其中晴天液流的变化呈“单峰”型曲线；而雨天液流变化呈“单峰”或“双峰”型曲线。太阳辐射是影响沙柳液流变化的首要因子，且随着时间尺度的扩大，液流变化的解释率降低，影响因子的数量增多。综上，在生长季内，沙柳液流量随径级增大而增大，但不同径级液流变化存在差异。

关键词: 沙柳, 环境因子, 不同径级, 液流

CLC Number:

S718

Wenjuan LIU, Shiji ZHANG, Hongwei CHEN, Jianjun YANG, Zhaomin HAN, Zhiyong PEI. Sap Flow Characteristics of Different Diameter Classes of Salix psammophila and Its Response to Environmental Factors[J]. Journal of Agricultural Science and Technology, 2025, 27(4): 239-249.

刘文娟, 张世纪, 陈宏伟, 杨建军, 韩兆敏, 裴志永. 不同径级沙柳液流特征及其对环境因子的响应[J]. 中国农业科技导报, 2025, 27(4): 239-249.

Figures/Tables 10

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天气 Weather	径级 Diameter class/mm	回归方程Regression equation	决定系数R²
晴天 Sunny day	6<SD≤8	Y=5.996+0.012R+1.148Vw-0.354Ta+0.794Ts+2.091VPD+0.057RH+0.365SWP	0.793
	8<SD≤10	Y=11.647+0.022R+2.053Vw+2.264VPD+0.076RH	0.888
	10<SD≤12	Y=24.653+0.025R+0.49SWP	0.884
	SD>12	Y=22.4+0.041R+4.898Vw-0.609Ta+1.186Ts+0.842SWP	0.868
雨天 Rainy day	6<SD≤8	Y=-6.452+0.006R-0.246SWP+0.278RH+7.816VPD-0.3Ta-0.231Vw+0.222Ts	0.710
	8<SD≤10	Y=2.308+0.012R+6.522VPD+0.187RH-0.583Vw-0.237SWP	0.814
	10<SD≤12	Y=-8.19+0.012R+16.092VPD+0.386RH-0.495Ta	0.888
	SD>12	Y=-20.393+0.018R+30.075VPD+0.812RH-1.284Ta	0.761

天气 Weather	径级 Diameter class/mm	回归方程Regression equation	决定系数R²
晴天 Sunny day	6<SD≤8	Y=5.996+0.012R+1.148Vw-0.354Ta+0.794Ts+2.091VPD+0.057RH+0.365SWP	0.793
	8<SD≤10	Y=11.647+0.022R+2.053Vw+2.264VPD+0.076RH	0.888
	10<SD≤12	Y=24.653+0.025R+0.49SWP	0.884
	SD>12	Y=22.4+0.041R+4.898Vw-0.609Ta+1.186Ts+0.842SWP	0.868
雨天 Rainy day	6<SD≤8	Y=-6.452+0.006R-0.246SWP+0.278RH+7.816VPD-0.3Ta-0.231Vw+0.222Ts	0.710
	8<SD≤10	Y=2.308+0.012R+6.522VPD+0.187RH-0.583Vw-0.237SWP	0.814
	10<SD≤12	Y=-8.19+0.012R+16.092VPD+0.386RH-0.495Ta	0.888
	SD>12	Y=-20.393+0.018R+30.075VPD+0.812RH-1.284Ta	0.761

径级 Diameter class/mm	风速 Vw/（m·s^-1）	空气温度 Ta/℃	相对湿度 RH/%	饱和水汽压差VPD	太阳辐射 R/（W·m^-2）	土壤水势 SWP/KPa	土壤温度 Ts/℃
6<SD≤8	0.801^**	0.785^**	-0.632^**	0.748^**	0.917^**	0.110	-0.200
8<SD≤10	0.807^**	0.806^**	-0.623^**	0.743^**	0.931^**	0121	-0.191
10<SD≤12	0.840^**	0.812^**	-0.653^**	0.776^**	0.945^**	0.120	-0.199
SD>12	0.809^**	0.796^**	-0.604^**	0.736^**	0.931^**	0.105	-0.181

径级 Diameter class/mm	风速 Vw/（m·s^-1）	空气温度 Ta/℃	相对湿度 RH/%	饱和水汽压差VPD	太阳辐射 R/（W·m^-2）	土壤水势 SWP/KPa	土壤温度 Ts/℃
6<SD≤8	0.801^**	0.785^**	-0.632^**	0.748^**	0.917^**	0.110	-0.200
8<SD≤10	0.807^**	0.806^**	-0.623^**	0.743^**	0.931^**	0121	-0.191
10<SD≤12	0.840^**	0.812^**	-0.653^**	0.776^**	0.945^**	0.120	-0.199
SD>12	0.809^**	0.796^**	-0.604^**	0.736^**	0.931^**	0.105	-0.181

径级 Diameter class/mm	风速 Vw/（m·s^-1）	空气温度 Ta/℃	相对湿度 RH/%	饱和水汽压差VPD	太阳辐射 R/（W·m^-2）	土壤水势 SWP/KPa	土壤温度 Ts/℃
6<SD≤8	0.504^**	0.142	-0.822^**	0.742^**	0.558^**	0.303^**	-0.409^**
8<SD≤10	0.455^**	0.343^**	-0.795^**	0.778^**	0.689^**	0.210^*	-0.224^*
10<SD≤12	0.237^**	0.548^**	-0.340^**	0.521^**	0.457^**	0.220^*	0.129
SD>12	0.358^**	0.555^**	-0.480^**	0.638^**	0.518^**	0.260^*	0.051