PARTITIONING OF NIGHT SAP FLOW OF ACACIA MANGIUM AND ITS IMPLICATION FOR ESTIMATING WHOLE-TREE TRANSPIRATION

doi:10.17521/cjpe.2007.0099

Abstract

Abstract:

Aims This study was designed to analyze the partitioning of night sap flow in Acacia mangium and its implication for estimating whole-tree transpiration.

Methods Analyses were performed on the partitioning of night sap flow into refilling of internal water storage and transpiration in A. mangium. Sap flow of trees was monitored continuously with Granier's sensors for estimating whole-tree transpiration. Night sap flow data were used to calculate trunk water recharge. Possible night transpiration and stomatal conductance at leaf level in the canopy were measured with a Li-6400 photosynthesis measuring system.

Important findings Vapor pressure deficit (VPD) and wind speed (V) could not fully explain sap flow in A. mangium at night (night leaf transpiration and stomatal conductance were weak). Therefore, night sap flow of mature A. mangium trees was mainly associated with water recharge in the trunk. No significant change in night water recharge of the trunk was found at both seasonal and inter-annual scales. Morphological features of trees including diameter at the breast height (DBH), tree height, and canopy size could explain variances of night water recharge. Furthermore, the error caused by night water recharge on whole-tree transpiration was negligible. The mechanisms and ecological implications of night sap flow partitioning of A. mangium deserve further investigation.

Key words: Acacia mangium, Granier's thermal dissipation probe method, night sap flow, night transpiration

WANG Hua, ZHAO Ping, CAI Xi-An, WANG Quan, MA Ling, RAO Xing-Quan, ZENG Xiao-Ping. PARTITIONING OF NIGHT SAP FLOW OF ACACIA MANGIUM AND ITS IMPLICATION FOR ESTIMATING WHOLE-TREE TRANSPIRATION[J]. Chin J Plant Ecol, 2007, 31(5): 777-786.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2007.0099

https://www.plant-ecology.com/EN/Y2007/V31/I5/777

Figures/Tables 17

References 23

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夜间液流密度 Night sap flux density (g H₂O·m^-2·s^-1)		水汽压亏缺 Vapor pressure deficit (kPa)	风速 Wind speed (m·s^-1)
旱季 Dry season	泊松相关系数 Pearson correlation	0.237^**	0.118^**
	显著度Sig. (2-tailed)	0.000	0.000
	样本数n	2 015	1 961
湿季Wet season	泊松相关系数 Pearson correlation	0.236^**	0.101^**
	显著度Sig. (2-tailed)	0.000	0.000
	样本数n	2 196	1 300

夜间液流密度 Night sap flux density (g H₂O·m^-2·s^-1)		水汽压亏缺 Vapor pressure deficit (kPa)	风速 Wind speed (m·s^-1)
旱季 Dry season	泊松相关系数 Pearson correlation	0.237^**	0.118^**
	显著度Sig. (2-tailed)	0.000	0.000
	样本数n	2 015	1 961
湿季Wet season	泊松相关系数 Pearson correlation	0.236^**	0.101^**
	显著度Sig. (2-tailed)	0.000	0.000
	样本数n	2 196	1 300

因变量 Dependent	自变量 Independent	Model fit方程 Model fit equation	R²	p
夜间液流密度 Night sap flux density (g H₂O·m^-2·s^-1)	2月夜间水汽压亏缺 VPD at night in February (kPa)	y=0.376 9+0.111 9x	0.156	0.000
	2月夜间风速 Wind speed at night in February (m·s^-1)	y=0.762 8-0.029 3x	0.005	0.191
	8月夜间水汽压亏缺VPD at night in August (kPa)	y=3.411 9+0.561 5x	0.061	0.001
	8月夜间风速Wind speed at night in August (m·s^-1)	y=3.926 7+0.156 7x	0.001	0.699

因变量 Dependent	自变量 Independent	Model fit方程 Model fit equation	R²	p
夜间液流密度 Night sap flux density (g H₂O·m^-2·s^-1)	2月夜间水汽压亏缺 VPD at night in February (kPa)	y=0.376 9+0.111 9x	0.156	0.000
	2月夜间风速 Wind speed at night in February (m·s^-1)	y=0.762 8-0.029 3x	0.005	0.191
	8月夜间水汽压亏缺VPD at night in August (kPa)	y=3.411 9+0.561 5x	0.061	0.001
	8月夜间风速Wind speed at night in August (m·s^-1)	y=3.926 7+0.156 7x	0.001	0.699

年份 Year	夜间水分补充量 Night water recharge (kg·d^-1)	平方和 Sum of squares	自由度 df	方差 Mean square	F	显著度 Sig.
2004	组间 Between groups	54.171	11	4.925	1.961	0.036
	组内 Within groups	361.540	144	2.511	-	-
	总计 Total	415.711	155	-	-	-
2005	组间 Between groups	40.520	11	3.684	1.228	0.275
	组内 Within groups	396.054	132	3.000	-	-
	总计 Total	436.574	143	-	-	-