Milberg Per, Törnqvist Lina, Westerberg Lars M, Bastviken David
Department of Physics, Chemistry and Biology, Conservation Ecology Group, Linköping University, SE 581 83, Linköping, Sweden.
Department of Thematic Studies - Environmental Change, Linköping University, SE 581 83, Linköping, Sweden.
AoB Plants. 2017 Jul 4;9(4):plx029. doi: 10.1093/aobpla/plx029. eCollection 2017 Jul.
Methane (CH) emissions via emergent aquatic macrophytes can contribute substantially to the global CH balance. We addressed temporal variability in CH flux by using the static chamber approach to quantify fluxes from plots dominated by two species considered to differ in flux transport mechanisms (, ). Temporal variability in daily mean emissions from early June to early October was substantial. The variable that best explained this variation was air temperature. Regular and consistent diel changes were absent and therefore less relevant to include when estimating or modelling CH emissions. Methane emissions per m from nearby plots were similar for and indicating that CH production in the system influenced emissions more than the species identity. This study indicates that previously observed diel patterns and species-effects on emissions require further evaluation to support improved local and regional CH flux assessments.
通过挺水水生植物排放的甲烷（CH）对全球CH平衡有很大贡献。我们采用静态箱法来量化来自以两种通量传输机制不同的物种为主的样地的通量，以此研究CH通量的时间变异性（，）。6月初至10月初每日平均排放的时间变异性很大。最能解释这种变化的变量是气温。不存在规律且一致的昼夜变化，因此在估算或模拟CH排放时纳入这些变化的相关性较小。附近样地每平方米的甲烷排放量对于和来说是相似的，这表明系统中的CH产生对排放的影响大于物种特性。本研究表明，先前观察到的昼夜模式和物种对排放的影响需要进一步评估，以支持改进局部和区域CH通量评估。
