华北土石山区油松生长季夜间液流分配特征

doi:10.11707/j.1001-7488.LYKX20220190

Abstract

Abstract:

Objective: By studying the characteristics of nocturnal sap flow and environmental driving factors in Pinus tabuliformis during the growing season, to reveal the characteristics of nocturnal sap flow component splitting, to discuss the correlation between components of nocturnal sap flow and meteorological factors, as well as the response of stem refilling to meteorological factors, and provide theoretical basis for the management decision of water resources and water-source conservation forests in rocky mountain area of North China. Method: Taking P. tabuliformis in rocky mountain area of North China as the research objection, 18 sample trees were selected according to the diameter size, using Granier Thermal Dispersion Probe (TDP) technique to continuously observe nocturnal sap flow during the growing season of 2014, combined with the weighing lysimeter meter and homemade micro-evapotranspiration meter to calculate the evapotranspiration and to resolve the destination of nocturnal sap flow; and to correlate nocturnal sap flow with meteorological factors such as soil water content, atmospheric temperature, humidity and photosynthetically active radiation to determine the main driving factors. Result: The results showed that: the nocturnal sap flow velocity gradually decreased on typical sunny days in June, July, August , and September, and was higher from 18:00 to 24:00 than from 00:00 to 05:00. The nocturnal sap flow was mainly used to refill the stem that had lost too much water during the day, so that the storage capacity of the stem of P. tabuliformis basically reached saturation by 24:00, so the nocturnal sap flow velocity tended to stabilize between 00:00 and 05:00. The proportion of nocturnal sap flow used for stem refilling (95.34%) was significantly higher than that used for nocturnal transpiration (4.66%), nocturnal stem refilling of P. tabuliformis was highly significantly positively correlated with vapor pressure deficit (R²=0.793, P < 0.01), while it was almost insensitive to soil water content (R²=0.105, P > 0.05), indicating that nocturnal sap flow was mainly influenced by vapor pressure deficit. Conclusion: Nocturnal sap flow during the growing season of P. tabuliformis in rocky mountain area of North China showed a gradual decrease over time. The vast majority of nocturnal sap flow was used for nocturnal stem refill, and among the meteorological factors, vapor pressure deficit was the main factor driving nocturnal stem refill and nocturnal sap flow(P < 0.01).

Key words: nocturnal sap flow, distribution characteristics, stem refilling, nocturnal transpiration, in rocky mountain area of North China

CLC Number:

Lei Hu,Jianbo Jia,Wende Yan,Yifan Wang,Ruiqiao Wu,Yu Chen. Nocturnal Sap Flow Distribution Characteristics During the Growing Season of Pinus tabuliformis in Rocky Mountain Area of North China[J]. Scientia Silvae Sinicae, 2024, 60(4): 91-98.

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径阶 Diameter class/cm	样木 Sample tree	DBH/cm	树高 Tree height/m	边材面积 Sapwood area/cm²
10~13	S₁	12.28	6.26	36.55
	S₂	10.73	5.67	21.83
	S₃	11.10	6.93	42.93
	S₄	10.83	5.83	32.12
	S₅	10.92	6.18	22.39
	S₆	12.26	7.11	46.49
14~17	S₇	15.68	6.03	37.87
	S₈	16.23	4.92	53.10
	S₉	16.54	4.89	40.92
	S₁₀	17.84	8.61	45.67
	S₁₁	15.88	4.85	38.57
	S₁₂	17.93	8.84	46.01
18~21	S₁₃	18.27	8.48	47.28
	S₁₄	19.02	7.47	50.12
	S₁₅	20.03	10.86	54.03
	S₁₆	18.40	8.34	47.77
	S₁₇	18.24	8.6	58.94
	S₁₈	18.35	8.1	47.58

月份 Month	温度 Atmospheric temperature/°C	土壤含水量 Soil water content（%）	饱和水汽压 Vapor pressure deficit/kPa
6月June	0.955**	?0.612*	0.935**
7月July	0.908**	0.059	0.935**
8月August	0.935**	?0.317	0.883**
9月September	0.966**	?0.646*	0.964**

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Nocturnal Sap Flow Distribution Characteristics During the Growing Season of Pinus tabuliformis in Rocky Mountain Area of North China

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