林业科学2024，Vol.60Issue(3)：100-110,11.DOI:10.11707/j.1001-7488.LYKX20230249
散射辐射比例对华北平原杨树人工林生态系统能量分配的影响
Impacts of Diffuse Radiation Fraction on Energy Partitioning in a Poplar Plantation in the North China Plain
摘要
Abstract
[Objective]Under the background of obvious shifts in the amount and component of global radiation,this study aims to elucidate the impact of variations in the fraction of diffuse radiation(Fdif)on energy partitioning of a poplar plantation in the North China Plain.[Method]The eddy covariance techniques and microclimate observations were used to investigate energy fluxes and environmental variables in a poplar plantation during the growing seasons of 2019 and 2021(DOY 91-304).[Result]The energy distribution of the ecosystem primarily consisted of latent heat flux(LE)during the mid-growing season(DOY 152-243),whereas of sensible heat flux(H)during early(DOY 91-151)and late(DOY 244-304)growing seasons.There was a significant negative correlation between Fdif and Bowen ratio(β),and a significant positive correlation between Fdif and Gs,Ω,and α.Path analysis revealed that Gs was the crucial factor regulating the ecosystem's energy distribution.When Fdif decreased,Gs decreased,saturated water vapor pressure difference(VPD)increased,and the ecosystem's β significantly increased,which in turn altered ecosystem energy partition patterns.[Conclusion]The change of Fdif will affect the energy distribution of the poplar plantation ecosystem in the North China Plain.A decrease in Fdif results in a higher proportion of LE and a lower proportion of H,significantly affecting energy partitioning in poplar plantation ecosystems.In the context of climate change,this study not only provides a deep insight into the energy allocation mechanisms of poplar plantation ecosystems in the North China Plain,but also plays a crucial role in accurately assessing the ecological service functions of these forests.关键词
散射辐射/杨树人工林/能量分配/通径分析/华北平原Key words
diffuse radiation/poplar plantation/energy partition/path analysis/North China Plain分类
农业科技引用本文复制引用
徐磊,吴小云,律江,石云,朱梦洵,许行,张志强..散射辐射比例对华北平原杨树人工林生态系统能量分配的影响[J].林业科学,2024,60(3):100-110,11.基金项目
中国科协青年人才托举工程项目(YESS20230091) （YESS20230091）
国家自然科学基金项目(32301664) （32301664）
中央高校基本科研业务费专项资金(QNTD202303) （QNTD202303）
中国博士后科学基金特别资助和面上项目(2023T160055,2022M10407) （2023T160055,2022M10407）
国家重点研发计划(2022YFF1302501). （2022YFF1302501）
