Analyses of transpiration water consumption of Abies georgei var. smithii and its driving factors in southeastern Tibet

doi:10.12302/j.issn.1000-2006.202010049

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (6): 151-158.doi: 10.12302/j.issn.1000-2006.202010049

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Analyses of transpiration water consumption of Abies georgei var. smithii and its driving factors in southeastern Tibet

LI Jiangrong(), GUO Qiqiang, ZHENG Weilie^*()

Institute of Tibet Plateau Ecology, Tibet Agricultural & Animal Husbandry University, Key Laboratory of Forest Ecology in Tibet Plateau(Tibet Agricultural & Animal Husbandry University), Ministry of Education, National Forest Ecosystem Observation & Research Station of Nyingchi Tibet,Nyingchi 860000,China

Received:2020-10-30 Accepted:2021-04-23 Online:2021-11-30 Published:2021-12-02
Contact: ZHENG Weilie E-mail:ljrong06@126.com;zhengweilie@xza.edu.cn

Abstract

Abstract:

【Objective】 The transpiration water consumption of Abies georgei var. smithii individuals with different diameters at breast height (DBH) was studied, and its correlations with meteorological factors were analyzed. This information could provide an important reference for understanding the forest growth rule in the sub-high mountain area of Tibet Autonomous Region. 【Method】 A stem sap flow measurement system was used to measure the transpiration water consumption of A. georgei var. smithii in the Sejila Mountains of southeastern Tibet. Eight individuals of A. georgei var. smithii with different DBH were measured, as well as five meteorological factors. 【Result】 The diurnal variation of the sap flow displayed a single peaked curve on sunny days, and the average stem sap flow rates of the eight samples were 137.09, 142.71 and 184.43 g/h in July, August and September, respectively. The activity period of sap flow was from 10:00 to 22:00, and its peak value occurred at approximately 16:00. The transpiration water consumption per unit sapwood area was significantly positively correlated with air temperature and photosynthetic active radiation, and was positively correlated with saturated vapor pressure difference (VPD), but was negatively correlated with air relative humidity, and had no relation with wind speed. The ranking of correlation coefficients was air relative humidity > air temperature > photosynthetic active radiation > VPD. The DBH was significantly correlated with sapwood area (R ²=0.999) and transpirtation water consumption per day (R²=0.937). 【Conclusion】 The diurnal variation in the transpiration water consumption of A. georgei var. smithii was of “N” type, which was significantly affected by environmental factors, such as air temperature, humidity, and photosynthetic active radiation. The daily transpiration water consumption per plant increased rapidly with the increase in DBH.

Key words: Abies georgei var. smithii, transpiration water consumption, driving factor, southeastern Tibet

CLC Number:

S718.5

LI Jiangrong, GUO Qiqiang, ZHENG Weilie. Analyses of transpiration water consumption of Abies georgei var. smithii and its driving factors in southeastern Tibet[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2021, 45(6): 151-158.

Figures/Tables 7

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编号 No.	树高/ m height	胸径 (去皮)/ cm DBH	边材厚/ cm sapwood depth	边材面积/ cm² sapwood area	冠幅直径/ m canopy diameter	探针长度/ cm probe length
1	5.2	7.01	1.02	19.17	3.4	30
2	6.1	8.28	1.10	24.80	3.2	30
3	6.2	8.92	1.16	28.25	3.8	30
4	21.4	29.46	2.35	200.03	4.5	50
5	22.8	30.25	2.34	205.11	4.3	50
6	25.5	42.04	2.75	339.25	4.6	50
7	30.4	45.06	2.81	372.82	5.4	80
8	41.8	84.71	4.58	1 152.41	6.8	80

编号 No.	T_a/ ℃	H_R %	E_VPD/ kPa	R_PAR/ (μmol· m^-2·s^-1)	风速/ (m·s^-1) wind speed
1	0.637^**	-0.805^**	0.240^*	0.636^**	0.038
2	0.704^**	-0.771^**	0.218^*	0.703^**	0.151
3	0.730^**	-0.843^**	0.228^*	0.678^**	0.134
4	0.674^**	-0.780^**	0.260^*	0.486^**	0.132
5	0.660^**	-0.710^**	0.211^*	0.406^**	-0.185
6	0.699^**	-0.767^**	0.257^*	0.470^**	0.179
7	0.616^**	-0.635^**	0.255^*	0.303^**	0.202
8	0.519^**	-0.743^**	0.212^*	0.453^**	-0.047

编号 No.	回归方程regression equation	R²	df
1	Y=-59.26+22.19 T_a+2.29 H_R-326.67 E_VPD +0.004 R_PAR	0.847	73
2	Y=-104.98+1.78 T_a+2.4 H_R-253.61 E_VPD +0.01 R_PAR	0.866	73
3	Y=-25.38+37.17 T_a+2.44 H_R-490 E_VPD +0.01 R_PAR	0.789	73
4	Y= 575.23+119.84 T_a+1.27 H_R-1 369.53 E_VPD +0.15 R_PAR	0.827	73
5	Y= 106.37+18.91 T_a+0.69 H_R-182.6 E_VPD +0.03 R_PAR	0.786	73
6	Y= 641.11+114.73 T_a+3.79 H_R-1 157.31 E_VPD +0.27 R_PAR	0.831	73
7	Y= 198.21+23.12 T_a+1.81 H_R-181.24 E_VPD +0.06 R_PAR	0.732	73
8	Y= 402.81+173.88 T_a+9.48 H_R-2 591.78 E_VPD +0.12 R_PAR	0.767	73

Analyses of transpiration water consumption of Abies georgei var. smithii and its driving factors in southeastern Tibet

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