Characteristics of the sap flow of Populus alba var. pyramidalis in typical forests in the northeastern part of the Mu Us Desert

doi:10.7522/j.issn.1000-694X.2024.00117

Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (2): 176-183.DOI: 10.7522/j.issn.1000-694X.2024.00117

Characteristics of the sap flow of Populus alba var. pyramidalis in typical forests in the northeastern part of the Mu Us Desert

Qimin Ma¹^,²(), Xuran Luo¹, Rengui Zhao¹, Zengyan Wang⁴, Wenli Yu¹, Xiaopeng Jia³()

^1.College of Resources and Environment，Chengdu University of Information Technology，Chengdu 610225，China
^2.National Cryosphere Desert Data Center /, Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730070，China
^3.Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730070，China
^4.The College of Geography and Environmental Science / MOE Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions，Henan University，Kaifeng 475004，Henan，China

Received:2024-09-08 Revised:2024-12-10 Online:2025-03-20 Published:2025-03-26
Contact: Xiaopeng Jia

Abstract

Abstract:

Understanding the water consumption characteristics of Populus alba var. pyramidalis is of great significance to the development of scientific water use and irrigation strategies for sand plantation forests as well as to the management and construction of forest farms. The study used the wrapped trunk stem flow meter to determine the sap flow of P. alba var. pyramidalis， and long-term monitoring of environmental factors in the Mu Us Desert. The results show that different meteorological conditions and environmental factors have different degrees of influence on the sap flow of P. alba var. pyramidalis， the maximum sap flow rate on sunny days， followed by cloudy days， and the minimum on rainy days， and the cumulative amount of daily sap flow was 16.38 L， 12.56 L， and 2.22 L， respectively， and the average sap flow rates of sunny and cloudy days were close to those of cloudy days. The average daily liquid flow rate of each month from May to October was 12.12， 14.07， 14.08， 11.60， 8.73 and 3.92 L， respectively， and May to August was the main water consumption period of P. alba var. pyramidalis， with a cumulative water consumption of 1 722.53 L. The sap flow of P. alba var. pyramidalis was significantly positively correlated with net radiation， saturated water vapor pressure difference， air temperature， solar radiation， soil heat flux and soil temperature， with correlation coefficients of 0.656， 0.641， 0.634， 0.625， 0.605， 0.467， respectively； and it was negatively correlated with soil moisture， relative humidity and precipitation， with correlation coefficients of -0.340， -0.233， -0.178， respectively； and it was irrelevant to the wind speed， of which the effect of net radiation was the most important for P. alba var. pyramidalis liquid flow. The effect of net radiation on the fluid flow of Populus alba var. pyramidalis was the largest.

Key words: Populus alba var. pyramidalis, heat balance method, trunk sap flow, Mu Us Desert, environmental factors

CLC Number:

Q945

Qimin Ma, Xuran Luo, Rengui Zhao, Zengyan Wang, Wenli Yu, Xiaopeng Jia. Characteristics of the sap flow of Populus alba var. pyramidalis in typical forests in the northeastern part of the Mu Us Desert[J]. Journal of Desert Research, 2025, 45(2): 176-183.

Figures/Tables 5

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指标	液流速率	气温	太阳辐射	相对湿度	饱和水汽压差	土壤热通量	土壤湿度	土壤温度	风速	降雨	净辐射
液流速率	1
气温	0.634^**	1
太阳辐射	0.625^**	0.602^**	1
相对湿度	-0.233^**	-0.263^**	-0.650^**	1
饱和水汽压差	0.641^**	0.996^**	0.642^**	-0.306^**	1
土壤热通量	0.605^**	0.708^**	0.843^**	-0.573^**	0.734^**	1
土壤湿度	-0.340^**	-0.554^**	-0.221^**	0.007	-0.559^**	-0.243^**	1
土壤温度	0.467^**	0.765^**	0.262^**	0.130	0.747^**	0.270^**	-0.726^**	1
风速	-0.012	0.080	0.061	-0.129	0.071	0.105	0.146	-0.079	1
降雨	-0.178^*	0.143	-0.318^**	0.324^**	0.122	-0.155^*	-0.230^**	0.275^**	0.068	1
净辐射	0.656^**	0.658^**	0.891^**	-0.440^**	0.685^**	0.772^**	-0.321^**	0.424^**	0.058	-0.174^*	1

指标	液流速率	气温	太阳辐射	相对湿度	饱和水汽压差	土壤热通量	土壤湿度	土壤温度	风速	降雨	净辐射
液流速率	1
气温	0.634^**	1
太阳辐射	0.625^**	0.602^**	1
相对湿度	-0.233^**	-0.263^**	-0.650^**	1
饱和水汽压差	0.641^**	0.996^**	0.642^**	-0.306^**	1
土壤热通量	0.605^**	0.708^**	0.843^**	-0.573^**	0.734^**	1
土壤湿度	-0.340^**	-0.554^**	-0.221^**	0.007	-0.559^**	-0.243^**	1
土壤温度	0.467^**	0.765^**	0.262^**	0.130	0.747^**	0.270^**	-0.726^**	1
风速	-0.012	0.080	0.061	-0.129	0.071	0.105	0.146	-0.079	1
降雨	-0.178^*	0.143	-0.318^**	0.324^**	0.122	-0.155^*	-0.230^**	0.275^**	0.068	1
净辐射	0.656^**	0.658^**	0.891^**	-0.440^**	0.685^**	0.772^**	-0.321^**	0.424^**	0.058	-0.174^*	1

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Characteristics of the sap flow of Populus alba var. pyramidalis in typical forests in the northeastern part of the Mu Us Desert

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