生态学杂志2025，Vol.44Issue(2)：383-388,6.DOI:10.13292/j.1000-4890.202502.022
华北落叶松光抑制的垂直空间异质性及其主要影响因素
Vertical spatial heterogeneity on photoinhibition of Larix principis-rupprechtii and the main influencing fac-tors
摘要
Abstract
To better understand the photosynthetic ecophysiological characteristics of Larix principis-rupprechtii and explore the mechanism of photoinhibition,we measured canopy photosynthetic indicators of Larix principis-ruppre-chtii plantation under intense irradiation using Li-6400 portable photosynthetic instrument,in Saihanba Mechanical Forest Farm of Hebei Province.We analyzed the main drivers of canopy photoinhibition and the relationships between net photosynthetic rate(Pn)and environmental factors.The results showed that under intense irradiation condition,photoinhibition occurred in the upper and middle layers of canopy.The change trend of stomatal limit values(La)was opposite to that of the intercellular CO2 concentration(Ci).The Pn in the upper and middle cano-py was positively correlated with relative humidity(RH)(with the correlation coefficients of 0.720 and 0.934,respectively),but negatively correlated with vapor pressure deficit(VPD)and temperature(T)(with the correla-tion coefficients of-0.850 and-0.820,respectively).The Pn in the lower canopy was significantly correlated with RH,VPD,and T,but their trends were opposite to upper and middle canopy.Our results indicated that the pho-toinhibition mainly occurred in the middle and upper canopy,with RH,VPD,and T as the main factors driving Pn.The response patterns of Pn to environmental factors were significantly different among upper,middle and lower can-opy.The results lay a foundation for regulating canopy structure,improving the microenvironment,and mitigating canopy photoinhibition.关键词
强光/气孔限制/非气孔限制/环境因子Key words
strong light/stomatal limitation/non-stomatal limitation/environmental factor引用本文复制引用
周颖,高媛,赵浩然,郭忠诚,籍翠莹,杨陈,刘强..华北落叶松光抑制的垂直空间异质性及其主要影响因素[J].生态学杂志,2025,44(2):383-388,6.基金项目
国家自然科学基金项目(32201556)和河北农业大学引进人才科研专项(YJ201942)资助. （32201556）
