Abstract This study compared the energy budget components of latent heat flux (LE), sensible heat flux (H), net radiation (Rn) and ground heat flux (G) between an undisturbed bog and an adjacent abandoned peatland pasture within the same peatland complex in western Newfoundland, Canada. The analysis was based on the period of April 2014 to August 2015 when measurements were concurrent at both sites, thus encompassing two growing seasons. The overall objective was to identify the impact of agricultural management and abandonment on peatland energy flux and partitioning. LE and H showed strong seasonal patterns for both sites. LE, which was higher at the pasture, peaked near the middle of the growing season. H at the bog was smaller than that at the pasture during the early growing season, but became larger during the middle and late growing seasons, with the maximum H occurring during the early growing season. G was the smallest flux in the energy budget at both sites, and it showed no obvious temporal pattern at either site. The variation in daytime average evapotranspiration (ET) was related to net radiation and vapor pressure deficit (VPD) at both sites. However, it was more strongly related to Rn. ET at the pasture site exhibited greater sensitivity to changes in Rn and VPD. Daytime ET increased and decreased with water table depth (WTD) when WTD was above and below a threshold of -0.24 m at the bog and -0.46 m at the pasture. The between-site differences in growing season H and LE (∆H and ∆LE) were mainly caused by their different vegetation conditions, and ∆H and ∆LE were negatively and positively related to ∆EVI (difference in enhanced vegetation index), respectively.

中文翻译：

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未受干扰的沼泽与相邻的废弃泥炭地牧场之间的能量通量比较

摘要 本研究比较了同一泥炭地复合体中未受干扰沼泽和相邻废弃泥炭地牧场之间的潜热通量 (LE)、感热通量 (H)、净辐射 (Rn) 和地热通量 (G) 的能量收支分量。在加拿大纽芬兰西部。该分析基于 2014 年 4 月至 2015 年 8 月期间在两个地点同时进行测量，因此包含两个生长季节。总体目标是确定农业管理和废弃对泥炭地能量通量和分区的影响。LE 和 H 两个站点都显示出强烈的季节性模式。LE 在牧场较高，在生长季节中期达到顶峰。沼泽H在生长初期比牧场小，但在生长中后期变大，最大 H 发生在早期生长季节。G 是两个站点能量收支中最小的通量，并且在任何一个站点都没有显示出明显的时间模式。白天平均蒸散量 (ET) 的变化与两个地点的净辐射和蒸汽压差 (VPD) 相关。然而，它与 Rn 的相关性更强。牧场的 ET 对 Rn 和 VPD 的变化表现出更大的敏感性。当 WTD 高于和低于沼泽处的阈值 -0.24 m 和牧场处的阈值 -0.46 m 时，白天 ET 随地下水位深度 (WTD) 增加和减少。生长季H和LE的点间差异（ΔH和ΔLE）主要是由其不同的植被条件引起的，ΔH和ΔLE分别与ΔEVI（增强植被指数的差异）呈负相关和正相关.