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

摘要/Abstract

摘要：

目的: 在全球辐射总量及其组成显著变化的背景下，明确散射辐射比例（F_dif）对华北平原杨树人工林生态系统能量分配的影响，为准确评估杨树人工林的生态服务功能和进一步完善生态系统过程模型提供科学依据。方法: 利用涡度相关技术和小气候观测，对2019、2021年生长季（DOY 91~304）杨树人工林生态系统的能量通量和环境因子开展研究。结果: 华北平原杨树人工林生态系统能量分配在生长季中期（DOY 152~243）以潜热通量（LE）为主，在生长季初期（DOY 91~151）和末期（DOY 244~304）以显热通量（H）为主。F_dif与波文比（β）呈显著负相关（P<0.01），与冠层导度（G_s；P<0.01)、冠层分离指数（Ω；P<0.05)和Priestley-Taylor系数（α；P < 0.01）呈显著正相关。通径分析结果表明，G_s是调节华北平原杨树人工林生态系统能量分配的主要因子，F_dif下降时，G_s降低，饱和水汽压差（VPD）增大，生态系统的β显著增大，进而改变生态系统能量分配模式。结论: F_dif变化影响华北平原杨树人工林生态系统能量分配，F_dif下降会导致能量平衡中的LE所占比例增加、H所占比例相应减小。在气候变化背景下，本研究不仅可深入揭示华北平原杨树人工林生态系统能量分配机制，同时也对准确评估森林生态系统服务功能起到至关重要的作用。

关键词: 散射辐射, 杨树人工林, 能量分配, 通径分析, 华北平原

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

中图分类号:

S718.55

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.

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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