东北林业大学学报2026，Vol.54Issue(9)：19-29,11.
北方典型半干旱区不同林龄樟子松人工林蒸腾速率和气孔导度变化特征
Variation Characteristics of Transpiration Rate and Stomatal Conductance of Pinus sylvestris var.mongolica Plantations with Different Stand Ages in Typical Semi-Arid Regions of Northern China
摘要
Abstract
To explore the transpiration water consumption processes and the age-dependent differences in stomatal regulation of Pinus sylvestris var.mongolica plantations in semi-arid sandy areas,we selected 13-,32-and 41-year-old P.sylvestris var.mongolica plantations in Zhanggutai area at the southern edge of Horqin Sandy Land as research objects.Sap flow density was continuously monitored,and meteorological factors and soil volumetric water content were simultaneously meas-ured.On this basis,canopy stomatal conductance and dimensionless decoupling coefficient were inversely calculated.The results showed that the transpiration of P.sylvestris var.mongolica plantations at three stand ages was all affected by envi-ronmental conditions,while their adaptive ranges varied among different stand ages.Air temperature,vapor pressure defi-cit and photosynthetically active radiation were the key factors controlling transpiration per unit leaf area.The mean tran-spiration per unit leaf area during the growing season for young,middle-aged and mature stands was 0.44,0.75 and 1.35 mm·d-1,with cumulative values of 71.79,121.16 and 216.83 mm,respectively.Stomatal conductance exhibited slight fluctuations throughout the growing season,with average values of 67.82,83.55 and 109.04 mmol·m-2·s-1 in se-quence.The average dimensionless decoupling coefficient was 0.190,0.140 and 0.044,indicating that the canopy of P.sylvestris var.mongolica in the study area was strongly coupled with the ambient atmosphere,and transpiration variation was largely restricted by stomatal behavior.Stomatal conductance was negatively correlated with vapor pressure deficit.The fitted slopes of young,middle-aged and mature stands were-24.325,-32.893 and-10.362,respectively.This sugges-ted that stomata of young and middle-aged stands were more sensitive to atmospheric drought.Although mature stands maintained relatively high stomatal conductance,their response amplitude to changes in vapor pressure deficit was smaller.Overall,stand age altered the transpiration intensity,stomatal sensitivity and canopy-atmosphere coupling degree of P.syl-vestris var.mongolica plantations,thereby affecting their water regulation strategies under semi-arid environments.关键词
气孔导度/蒸腾/樟子松/科尔沁沙地Key words
Stomatal conductance/Transpiration/Pinus sylvestris var.mongolica/Horqin Sandy Land分类
农业科技引用本文复制引用
骆文军,杨育国,汪文俊,张思超,刘骐鸣,邓继峰..北方典型半干旱区不同林龄樟子松人工林蒸腾速率和气孔导度变化特征[J].东北林业大学学报,2026,54(9):19-29,11.基金项目
辽宁省科技计划联合计划项目(自然科学基金面上项目)(2025-MSLH-605) （自然科学基金面上项目）
国家自然科学基金面上项目(32572156). （32572156）
