Carbon gas exchange at a southern Rocky Mountain wetland, 1996–1998
Carbon gas exchange at a southern Rocky Mountain wetland, 1996–1998
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DOI：
10.1029/2000gb001325
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发表时间：
2001-06
影响因子：
5.2
通讯作者：
K. Wickland;R. Striegl;M. Mast;D. Clow
中科院分区：
文献类型：
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作者：
K. Wickland;R. Striegl;M. Mast;D. Clow
1996-1998年对位于科罗拉多落基山国家公园海拔3200 m的亚高山湿地与大气之间的CO2和CH 4交换进行了观测。在无雪期间使用封闭室方法测量呼吸、净CO2通量和CH 4通量，在积雪期间使用气体扩散计算。测量的通量范围为1.2 - 526 mmol CO2 m−2 d−1（呼吸）、−1056 - 100 mmol CO2 m −2 d−1（净CO2交换）和0.1-36.8 mmol CH 4 m −2 d−1（正值表示向大气的排放）。呼吸速率和CH 4排放量与5cm土壤温度呈显著正相关。年呼吸和CH 4排放量的模拟是通过将通量-温度关系应用于1996-1998年的连续土壤温度记录。总光合作用，光子通量密度和土壤温度相关的双曲线方程建模。模拟的年通量估计表明，湿地是三年中每年向大气排放碳气体的净来源：1996年为8.9 mol C m−2 yr−1，1997年为9.5 mol C m−2 yr−1，1998年为9.6 mol C m−2 yr−1。这与从湿地收集的泥炭芯的14 C分析确定的0.7 mol m−2 yr−1的长期碳积累形成对比。
Carbon dioxide (CO2) and methane (CH4) exchange between the atmosphere and a subalpine wetland located in Rocky Mountain National Park, Colorado, at 3200 m elevation were measured during 1996–1998. Respiration, net CO2 flux, and CH4 flux were measured using the closed chamber method during snow‐free periods and using gas diffusion calculations during snow‐covered periods. The ranges of measured flux were 1.2‐526 mmol CO2 m−2 d−1 (respiration), −1056−100 mmol CO2m−2 d−1 (net CO2exchange), and 0.1–36.8 mmol CH4m−2 d−1 (a positive value represents efflux to the atmosphere). Respiration and CH4 emission were significantly correlated with 5 cm soil temperature. Annual respiration and CH4 emission were modeled by applying the flux‐temperature relationships to a continuous soil temperature record during 1996–1998. Gross photosynthesis was modeled using a hyperbolic equation relating gross photosynthesis, photon flux density, and soil temperature. Modeled annual flux estimates indicate that the wetland was a net source of carbon gas to the atmosphere each of the three years: 8.9 mol C m−2 yr−1 in 1996, 9.5 mol C m−2 yr−1 in 1997, and 9.6 mol C m−2 yr−1 in 1998. This contrasts with the long‐term carbon accumulation of ∼0.7 mol m−2 yr−1 determined from 14C analyses of a peat core collected from the wetland.