Analysis on diurnal variation of sap flow in Pinus massoniana and its influencing factors in Luoyang, Henan Province, China

doi:10.12302/j.issn.1000-2006.202106005

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1): 92-100.doi: 10.12302/j.issn.1000-2006.202106005

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Analysis on diurnal variation of sap flow in Pinus massoniana and its influencing factors in Luoyang, Henan Province, China

ZHU Lei(), XU Junliang, ZHANG Yiping(), LUO Pengfei, SHI Zhiqiang, HOU Jiayu, ZHAI Lexin

College of Horticulture and Plant Protertion, Henan University of Science and Technology, Luoyang 471023, China

Received:2021-06-03 Accepted:2021-09-30 Online:2023-01-30 Published:2023-02-01
Contact: ZHANG Yiping E-mail:1046884687@qq.com;zhang_yiping@haust.edu.cn

Abstract

Abstract:

【Objective】 The aims of this study are to understand the daily sap flow dynamics and the transpiration water consumption pattern of Pinus massoniana distributed in the northern boundary of China. The results from this study could provide a scientific basis for understanding of tree water use mechanisms. 【Method】 From June to October 2019, thermal diffusion probes (TDP) and automatic weather stations were used to monitor the trunk sap flow of P. massoniana and the surrounding environmental factors, respectively. This monitoring was conducted on the campus of Henan University of Science and Technology. 【Result】 (1) The sap flow rate of P. massoniana in the study area showed a single peak curve, which was higher in the day and lower in the night. The P. massoniana had nighttime sap flow, and the sap flow was more active before 0:00 than after 0:00. (2) From June to October, the average daily whole tree sap flow of P. massoniana was 36.08 kg, the average nighttime whole tree sap flow was 2.55 kg; The nighttime sap flow accounted for 4.87%-9.27% of the daily total sap flow, and the sap flow before midnight accounted for 83.42%-95.54% of the nighttime total sap flow. (3) The sap flow rate had a linear relationship with solar radiation, vapor pressure deficit (VPD), temperature, humidity, wind speed and precipitation (P < 0.05); solar radiation and VPD were the main factors affecting sap flow during the daytime and nighttime, respectively. 【Conclusion】 In relatively drier habitats of the central and western regions in China, the sap flow of P. massoniana showed an obvious diurnal variation pattern. Solar radiation and VPD were the main factors influencing the diurnal stem sap flow of P. massoniana in the research area. At the same time, the effect of nighttime sap flow on the transpiration water consumption of individual trees should be considered in the transpiration calculation.

Key words: Pinus massoniana, sap flow, environmental factor, Luoyang, Henan Province

CLC Number:

S718

ZHU Lei, XU Junliang, ZHANG Yiping, LUO Pengfei, SHI Zhiqiang, HOU Jiayu, ZHAI Lexin. Analysis on diurnal variation of sap flow in Pinus massoniana and its influencing factors in Luoyang, Henan Province, China[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(1): 92-100.

Figures/Tables 7

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References 38

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样树编号 No.	胸径/ cm DBH	树高/m tree height	冠幅/m crown width	边材厚度/cm sapwood thickness	边材面积/cm² sapwood area
1	20.2	12.0	5.4×5.1	7.4	214.0
2	25.3	14.0	7.7×8.1	9.5	333.8
3	21.8	12.4	5.8×6.2	8.1	246.6

月份 month	液流量/(kg·d^-1) sap flow				贡献率/% proportion			夜间液流时长/h duration of nocturnal sap flow
月份 month	整日均 diurnal average	夜均 nocturnat average	零点前 before midnight	零点后 after midnight	夜间占整日 nocturnat to the whole day	零点前 before midnight	零点后 after midnight	夜间液流时长/h duration of nocturnal sap flow
6	34.72	2.30	2.03	0.27	6.62	88.26	11.74	10.0
7	40.89	1.99	1.66	0.33	4.87	83.42	16.58	9.5
8	39.00	2.82	2.47	0.35	7.23	87.59	12.41	11.0
9	33.85	2.69	2.57	0.12	7.94	95.54	4.46	12.0
10	31.96	2.96	2.77	0.19	9.26	93.58	6.42	13.0

时间段 time	土壤含水量SWC			空气温度 air temperature		相对湿度 relative humidity		降水量 precipitation		饱和水汽压差 VPD		太阳辐射 solar radiation		风速 wind speed
时间段 time	10 cm	20 cm		空气温度 air temperature		相对湿度 relative humidity		降水量 precipitation		饱和水汽压差 VPD		太阳辐射 solar radiation		风速 wind speed
全天diurnal	-0.018	0.029	0.403^**		-0.483^**		-0.520^**		0.453^**		0.753^**		-0.205^*
白天daily	-0.004	0.027	0.469^**		-0.569^**		-0.521^**		0.489^**		0.738^**		-0.212^**
夜间night	-0.167^*	-0.170^*	0.485^**		-0.466^**		-0.284^**		0.529^**		0.097		-0.029

Analysis on diurnal variation of sap flow in Pinus massoniana and its influencing factors in Luoyang, Henan Province, China

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