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

doi:10.11707/j.1001-7488.LYKX20230249

Abstract

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 (F_dif) 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 F_dif and Bowen ratio (β), and a significant positive correlation between F_dif and G_s, Ω, and α. Path analysis revealed that G_s was the crucial factor regulating the ecosystem's energy distribution. When F_dif decreased, G_s 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 F_dif will affect the energy distribution of the poplar plantation ecosystem in the North China Plain. A decrease in F_dif 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.

Key words: diffuse radiation, poplar plantation, energy partition, path analysis, North China Plain

CLC Number:

S718.55

Lei Xu,Xiaoyun Wu,Jiang Lü,Yun Shi,Mengxun Zhu,Hang Xu,Zhiqiang Zhang. Impacts of Diffuse Radiation Fraction on Energy Partitioning in a Poplar Plantation in the North China Plain[J]. Scientia Silvae Sinicae, 2024, 60(3): 100-110.

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生物物理参数 Biophysical parameters	生长季Growing season
生物物理参数 Biophysical parameters	初期Early growing season	中期Mid-growing season	末期Last growing season
β	0.81 ± 0.03b	0.25 ± 0.01c	1.24 ± 0.08a
G_s	375.12 ± 10.04b	443.76 ± 9.79a	317.03 ± 10.36c
Ω	0.41 ± 0.01b	0.49 ± 0.01a	0.38 ± 0.01c
α	0.87 ± 0.01b	1.08 ± 0.01a	0.88 ± 0.01b

项目Item	2019	2021	2019—2021
斜率Slope	0.62	0.87	0.76
截距Intercept	11.79	2.38	5.87
R²	0.45	0.70	0.60

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Impacts of Diffuse Radiation Fraction on Energy Partitioning in a Poplar Plantation in the North China Plain

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