Riparian buffers serve as conduits through which carbon (C) cycles from terrestrial landscapes to aquatic systems and, ultimately, to oceanic or atmospheric sinks. Riparian areas have also been identified as zones of concentrated biogeochemical activity that often produce greater amounts of greenhouse gases than neighboring upland terrestrial and adjacent aquatic systems. Little work has explored how hydrologic classification of a stream may influence the magnitude of riparian soil processes. A three-way factorial field study examined soil carbon dioxide (CO₂) effluxes across flow regime (Groundwater and Runoff streams), season (autumn, winter, spring, and summer), and distance from stream edge (0, 10, and 20 m). Soil CO₂ efflux differed between flow regimes across seasons (P = 0.01), where Runoff sites had greater spring soil surface CO₂ efflux (i.e., soil respiration mean ± 1 SE = 2.98 ± 0.29 μmol CO₂ m⁻² s⁻¹) than Groundwater sites (1.40 ± 0.30 μmol CO₂ m⁻² s⁻¹). Soil CO₂ effluxes from Runoff sites were related to soil temperature (r_s value range = 0.58 to 0.82, all P < 0.0001) and soil moisture (r_s value range = −0.35 to 0.27, P = 0.02 to 0.03). However, effluxes were unrelated to soil moisture at Groundwater sites. Results of this study suggest that consideration of the riparian zone and demonstrated differences in flow regime are needed to understand forested stream C budgets. Anthropogenic landscape alteration and climate change can modify the natural flow regime which, in turn, may have consequences for aquatic C dynamics in streams draining altered riparian zones, particularly in forested settings.

河岸缓冲区是碳 (C) 从陆地景观到水生系统，并最终到海洋或大气汇的循环通道。河岸地区也被确定为生物地球化学活动集中的区域，通常比邻近的陆地陆地和邻近的水生系统产生更多的温室气体。很少有研究探讨河流的水文分类如何影响河岸土壤过程的大小。一项三向因子实地研究检查了土壤二氧化碳 (CO ₂ ) 跨流态（地下水和径流）、季节（秋季、冬季、春季和夏季）以及与河流边缘的距离（0、10 和 20米）。土壤 CO ₂不同季节流态之间的流出量不同（P  = 0.01），其中径流站点比地下水站点具有更大的春季土壤表面 CO ₂流出（即，土壤呼吸平均值 ± 1 SE = 2.98 ± 0.29 μmol CO ₂ m ^-2  s ^-1）(1.40 ± 0.30 μmol CO ₂ m ^-2  s ^-1 )。径流点土壤CO ₂流出量与土壤温度（r _s值范围= 0.58 至0.82，所有P  < 0.0001）和土壤水分（r _s值范围= -0.35 至0.27，P  = 0.02 到 0.03）。然而，外排与地下水位点的土壤水分无关。这项研究的结果表明，需要考虑河岸带和已证明的流态差异，以了解森林河流 C 预算。人为景观改变和气候变化可以改变自然流动状态，这反过来可能对排放改变的河岸带的溪流中的水生 C 动态产生影响，特别是在森林环境中。