Thünen Institute of Climate-Smart Agriculture, Bundesallee 65, 38116, Braunschweig, Germany.
Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalder Straße 84, 15374, Müncheberg, Germany.
Sci Rep. 2024 Jan 30;14(1):2533. doi: 10.1038/s41598-024-52349-0.
This study investigated the influence of vegetation and microforms on methane (CH) balances of a rewetted bog in north-west Germany. The two study sites are in close proximity on the same former peat extraction area, one dominated by Sphagnum-mosses and the other one by a dense Betula pubescens stand with a high Eriophorum vaginatum cover. The contribution of microforms (hummocks/hollows) to CH emissions and the effect of Betula encroachment has been studied. Transparent and opaque chambers were used to measure CH fluxes every 3-4 weeks during daytime for one year. For the estimation of annual balances, three methods were compared and the method using water level and soil temperature as explanatory variables was selected. Fluxes were scaled to the site level. The annual emissions per site are and 7.1 ± 1.5 g CH-C m year at the treed site and 36.1 ± 3.5 g CH-C m year at the open site, mainly controlled by higher water levels. Highest annual emissions originated from hollows at the open site, but in the vegetation period, hummock emissions tend to be higher. At the tree site, emission differences between the microforms were less pronounced. There were no differences between fluxes from transparent and opaque chambers.
本研究调查了植被和微地形对德国西北部再湿沼泽甲烷（CH）平衡的影响。这两个研究地点位于同一前泥炭开采区，彼此相邻，一个以泥炭藓为主，另一个以密叶桦林为主，并有较高的薹草属植物覆盖。研究了微地形（丘状地形/洼地地形）对 CH 排放的贡献以及桦木入侵的影响。在一年中白天每 3-4 周使用透明和不透明室测量 CH 通量。为了估算年际平衡，比较了三种方法，选择了使用水位和土壤温度作为解释变量的方法。通量被缩放至站点水平。每个站点的年排放量分别为 7.1±1.5 g CH-C·m-2·year-1 （有树站点）和 36.1±3.5 g CH-C·m-2·year-1 （开阔站点），主要由较高的水位控制。最高的年排放量来自开阔地的洼地，但在植被期，丘状地形的排放量往往更高。在树木生长的区域，微地形之间的排放差异不明显。透明和不透明室之间的通量没有差异。
