Azimuthal variation in nighttime sap flow and its mainly influence factors of Populus tomentosa

doi:10.17521/cjpe.2020.0089

Abstract

Abstract:

Aims To clarify the azimuthal regularity of nocturnal sap-flow activities of Populus tomentosa, which includes nocturnal transpiration (Nt) and stem water refilling (Sr), and explore the main impact factors of Nt and Sr in different orientations.
Methods The thermal dissipation method was used to monitor the nocturnal sap flow of P. tomentosa planted in wide and narrow rows patterns. The image method was used to distinguish Nt and Sr. An automatic weather station measured global solar radiation (R_s, kW·m^-2), air temperature (T_a, ℃), relative humidity (RH, %), wind speed (v, m·s^-1) and other environmental factors. Mechanical tensiometers measured soil water potential (ψ, kPa). The differences of nocturnal sap-flow among orientations and their main impact factors were determined by comparing the magnitudes of Nt and Sr and their correlations with the impact factors.
Important findings The results showed that, for trees on the east-wide-row, the west orientation has the largest Nt and Sr. The Sr in the west orientation was significantly larger than that in the other three orientations. In contrast, north oriented Nt was significantly smaller than that in the other three orientations. There was no significant difference in Nt and Sr among other orientations and the proportion of Sr accounted for the nighttime sap flow (Sr/Q) in all orientations. For trees on the west-wide-row, Nt and Sr in the west orientation were also the largest, and the Sr in the west orientation was significantly larger than that in the east and south. The Nt in the south orientation was the smallest and significantly smaller than that in the west and north. There was no significant difference in Nt and Sr among other orientations. The Sr/Q in the south orientation was significantly larger than that in the other three orientations. The Nt and Sr had significantly positive correlations with vapor pressure deficiency (VPD), and Nt and Sr in some orientations had significant correlations with T_a and RH, but Nt and Sr in all orientations had no significant correlation with v and ψ. The variation coefficient of Nt and Sr among the four orientations (Nt_CV and Sr_CV) had no significant correlation with VPD, T_a, RH, v and ψ. In addition, the Sr was significantly affected by the daytime sap flow. In conclusion, there were significant differences in nocturnal sap flow of P. tomentosa such as Nt and Sr, with west being the most dominant. VPD was the mainly meteorological impact factor of Nt and Sr in all orientations at night.

Key words: Populus tomentosa, orientation, nighttime transpiration, stem refilling

ZHAO Fei-Fei, MA Xu, DI Nan, WANG Ye, LIU Yang, LI Guang-De, JIA Li-Ming, XI Ben-Ye. Azimuthal variation in nighttime sap flow and its mainly influence factors of Populus tomentosa[J]. Chin J Plant Ecol, 2020, 44(8): 864-874.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2020.0089

https://www.plant-ecology.com/EN/Y2020/V44/I8/864

Figures/Tables 12

References 40

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编号 Number	胸径 Diameter at breast height (cm)	液流测量时期 Sap flow measured date	测量完整天数 Full measured days	宽行距位置 Wide row position
T₁	10.32	2011-05-16-05-19	4	W
T₂	10.56	2011-05-21-05-24	4	E
T₃	11.04	2011-05-26-05-29	4	W
T₄	9.80	2011-05-31-06-04	5	E
T₅	9.90	2011-06-06-06-12	7	E
T₆	10.65	2011-06-17-06-23	7	W
T₇	13.30	2011-06-25-07-03	9	W
T₈	12.72	2011-07-05-07-18	13	W
T₉	7.47	2011-07-19-07-29	11	W
T₁₀	8.35	2011-08-02-08-16	14	W

编号 Number	胸径 Diameter at breast height (cm)	液流测量时期 Sap flow measured date	测量完整天数 Full measured days	宽行距位置 Wide row position
T₁	10.32	2011-05-16-05-19	4	W
T₂	10.56	2011-05-21-05-24	4	E
T₃	11.04	2011-05-26-05-29	4	W
T₄	9.80	2011-05-31-06-04	5	E
T₅	9.90	2011-06-06-06-12	7	E
T₆	10.65	2011-06-17-06-23	7	W
T₇	13.30	2011-06-25-07-03	9	W
T₈	12.72	2011-07-05-07-18	13	W
T₉	7.47	2011-07-19-07-29	11	W
T₁₀	8.35	2011-08-02-08-16	14	W

	T_a (℃)	VPD (kPa)	RH (%)	v (m·s^-1)
白天-夜间 Daytime-nighttime	4.34^**	0.77^**	-12.08^**	0.73^**
相关系数 Correlation coefficient	0.812^**	0.879^**	0.849^**	0.533^**

	T_a (℃)	VPD (kPa)	RH (%)	v (m·s^-1)
白天-夜间 Daytime-nighttime	4.34^**	0.77^**	-12.08^**	0.73^**
相关系数 Correlation coefficient	0.812^**	0.879^**	0.849^**	0.533^**

方位 Orientation		E-S	E-W	E-N	S-W	S-N	W-N	n
宽行距位于东侧 Wide row in the east	平均差异 Average difference	-0.005	-0.027	0.021	-0.022	0.026	0.049^*	23
宽行距位于东侧 Wide row in the east	相关系数 Correlation coefficient	0.644^**	0.612^**	0.739^**	0.586^**	0.895^**	0.434^*	23
宽行距位于西侧 Wide row in the west	平均差异 Average difference	0.029	-0.11^**	-0.035	-0.14^**	-0.063^*	0.075^*	70
宽行距位于西侧 Wide row in the west	相关性 Correlation coefficient	0.621^**	0.471^**	0.675^**	0.609^**	0.445^**	0.344^*	70