Growing season sap-flow dynamics of Robinia pseudoacacia plantation in the semi-arid region of Loess Plateau, China

doi:10.3773/j.issn.1005-264x.2010.04.013

Abstract

Abstract:

Aim We studied the relationship between sap-flow velocity and meteorological factors to quantitatively correlate tree growth and transpirational water-consumption, determine the dynamic change of water use of Robinia pseudoacacia in a semi-arid region, reveal its mechanism to adapt to environmental factors and provide the theoretical basis for local ecological reconstruction of the environment.

Methods A thermal dissipation probe (TDP) was used to measure the sap-flow dynamics of R. pseudoacacia in Ansai County in the semi-arid region of the Loess Plateau of China during July 1-26, 2008. Soil water content, photosynthetic active radiation (PAR), air temperature, relative humidity, water vapor pressure deficit (VPD) and wind speed were measured at the same time.

Important findings Diurnal variation of sap flow displayed a broadly peaked curve during the season of rapid growth. The average value was 0.001 33 cm·s^-1. Sap-flow velocity per unit sapwood area was significantly correlated with PAR, air temperature and VPD and was negatively correlated with atmospheric relative humidity. The ranking of correlation coefficients was PAR > air temperature > VPD > relative humidity > wind speed. Sapwood area and diameter at breast height (DBH) were significantly correlated (r = 0.878), and sap-flow velocity per unit sapwood area decreased with increased stem diameter.

Key words: climatic factors, Loess Plateau, Robinia pseudoacacia, sap flow, thermal dissipation probe

WU Fang, CHEN Yun-Ming, YU Zhan-Hui. Growing season sap-flow dynamics of Robinia pseudoacacia plantation in the semi-arid region of Loess Plateau, China[J]. Chin J Plant Ecol, 2010, 34(4): 469-476.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2010.04.013

https://www.plant-ecology.com/EN/Y2010/V34/I4/469

Figures/Tables 8

References 20

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样木序号 Sample tree No.	林龄 Tree age (a)	树高 The height (m)	胸径(去皮) DBH (without bark) (cm)	边材厚度 Sapwood width (cm)	边材面积 Sapwood area (cm²)
1	40	13.5	20.5	1.2	72.76
2	40	13.0	17.3	1.0	51.21
3	40	13.0	18.0	1.1	58.40
4	40	14.0	24.0	1.3	93.27

样木序号 Sample tree No.	林龄 Tree age (a)	树高 The height (m)	胸径(去皮) DBH (without bark) (cm)	边材厚度 Sapwood width (cm)	边材面积 Sapwood area (cm²)
1	40	13.5	20.5	1.2	72.76
2	40	13.0	17.3	1.0	51.21
3	40	13.0	18.0	1.1	58.40
4	40	14.0	24.0	1.3	93.27

样木序号 Sample tree No.	光合有效辐射 PAR (MJ·m^-2)	大气温度 Air temperature (°C)	水汽压差 VPD (Pa)	相对湿度 Relative humidity (%)	风速 Wind speed (m·s^-1)
1	0.86^**	0.67^**	0.57^**	-0.54^**	0.43^*
2	0.87^**	0.74^**	0.64^**	-0.61^**	0.46^*
3	0.80^**	0.69^**	0.57^**	-0.55^**	0.37^*
4	0.86^**	0.72^**	0.60^**	-0.57^**	0.42^*

样木序号 Sample tree No.	光合有效辐射 PAR (MJ·m^-2)	大气温度 Air temperature (°C)	水汽压差 VPD (Pa)	相对湿度 Relative humidity (%)	风速 Wind speed (m·s^-1)
1	0.86^**	0.67^**	0.57^**	-0.54^**	0.43^*
2	0.87^**	0.74^**	0.64^**	-0.61^**	0.46^*
3	0.80^**	0.69^**	0.57^**	-0.55^**	0.37^*
4	0.86^**	0.72^**	0.60^**	-0.57^**	0.42^*

样木序号 Sample tree No.	回归方程 Regression equation	R²	自由度 df
1	V_s1 = 1.96 × 10^-6PAR - 1.06 × 10^-6VPD - 2.35 × 10^-5H	0.80	623
2	V_s2 = 1.24 × 10^-6PAR - 5.81 × 10^-7VPD - 1.24 × 10^-5H+7.52 × 10^-5v_w - 0.001	0.84	623
3	V_s3 = 2.21 × 10^-6PAR - 2.11 × 10^-7VPD - 4.51 × 10^-5H - 0.001	0.75	623
4	V_s4 = 1.66 × 10^-6PAR - 1.38 × 10^-7VPD - 3.33 × 10^-5H	0.84	623