灌溉排水学报2024，Vol.43Issue(3)：1-10,10.DOI:10.13522/j.cnki.ggps.2023283
潮河山区人工林树干液流特征及其对气象因子响应
Sap flow in tree trunks within Chaohe mountain area and its variation with meteorological factors
摘要
Abstract
[Objective]Water ascent in plant is driven by water evaporation from leaves,influenced by meteorological factors.Understanding its variation with these factors is important to unveil the mechanisms underlying plant transpiration.This paper is to investigate the correlation between sap flow and meteorological factors in a plantation located in the Chaohe mountain area.[Method]The experimental site is at the Dadaigou Experimental Station in Fengning County.Sap flow from May to October in different tree species including Larix principis-rupprechtii,Pinus tabulaeformis and Hippophae rhamnoides,was measured using the Granier-type thermal dissipation probe.Meteorological data measured during the same period were used to analyze their impact on the sap flows.[Result]① In sunny days,sap flow measured in all species increased in daytime and decreased in evening;it was larger in sunny days than in rainy days.Sap flow in Hippophae rhamnoides was faster and more sensitive to rainfall than other two species.② Hourly sap flow in all species was positively correlated to atmospheric temperature(Ta),vapor pressure deficit(VPD),net radiation(Rn)and wind velocity(W),and negatively correlated to rainfall and relative humidity(Rh).Rn is the factor affecting sap flow most,followed by VPD,Ta and Rh.③ Daily sap flow in Larix principis-rupprechtii,Pinus tabulaeformis and Hippophae rhamnoides was 2.78,1.44 and 5.27 mL/(cm2·h)separately,affected significantly by Rn,VPD and Ta.④ There was a significant delay in the response of sap flow to changes in meteorological factors for all three species,with the response to changes in VPD and Rn delayed by 20 min and 60 min for Larix principis-rupprechtii,40 min and 50 min for Pinus tabulaeformis,and 20 min and 50 min for Hippophae rhamnoides,respectively.[Conclusion]The meteorological factors that affect sap flow in the three species in the Chaohe mountain area were net radiation(Rn)and vapor pressure deficit(VPD).There was a significant delay in the response of sap flow to changes in meteorological factors.Studying plant transpiration and its variation with meteorological factors should consider such a delay.关键词
液流特征/气象因子/尺度/时滞Key words
characteristics of sap flow/meteorological factors/scales/time lag分类
农业科技引用本文复制引用
王祥,韩淑颖,翟家齐,张金萍,王庆明..潮河山区人工林树干液流特征及其对气象因子响应[J].灌溉排水学报,2024,43(3):1-10,10.基金项目
国家自然科学基金(52025093) （52025093）
流域水循环模拟与调控国家重点实验室自由探索课题(SKL2022TS01) （SKL2022TS01）
河北省水利科研项目(冀水科研2022-01,2023-72) （冀水科研2022-01,2023-72）
