Bortoluzzi Estelle, Epron Daniel, Siegenthaler Andy, Gilbert Daniel, Buttler Alexandre
Université de Franche-Comté, UMR 6565 CNRS, Laboratoire de Chrono-Ecologie, La Bouloie, F-25030 Besançon, France.
New Phytol. 2006;172(4):708-18. doi: 10.1111/j.1469-8137.2006.01859.x.
Carbon dioxide and methane (CH4) fluxes were measured in a cutover bog of the Jura Mountains (France) together with biotic and abiotic variables for two entire vegetation periods in order to compare the carbon balance of the bog at three stages of regeneration. Among all factors, air temperature and vegetation index (including leaf area of vascular plants, bryophyte density and bryophyte desiccation) were the two main determinants of ecosystem respiration and gross photosynthesis at light saturation. During 2004 and 2005, the vegetated plots acted as carbon sinks. Net carbon exchange ranged between 67 and 166 g C m(-2) yr(-1) for the Eriophorum-dominated plots and between 93 and 183 g C m(-2) yr(-1) for the Sphagnum-dominated plots. The bare peat plots represented a net carbon source (between -19 and -32 g C m(-2) yr(-1)). Methane fluxes accounted for a very small part of the total carbon efflux (< 2%). The recovery of vegetation in our naturally regenerating bog was beneficial for the carbon sequestration after the relatively short period of 20 yr.
在法国汝拉山脉一片皆伐沼泽地中，对二氧化碳和甲烷（CH₄）通量以及生物和非生物变量进行了两个完整植被期的测量，以便比较该沼泽地在三个恢复阶段的碳平衡。在所有因素中，气温和植被指数（包括维管植物叶面积、苔藓植物密度和苔藓植物干燥程度）是光饱和时生态系统呼吸和总光合作用的两个主要决定因素。在2004年和2005年期间，植被覆盖地块起到了碳汇的作用。以羊胡子草为主的地块净碳交换量在67至166克碳/平方米·年之间，以泥炭藓为主的地块净碳交换量在93至183克碳/平方米·年之间。裸露泥炭地块是净碳源（在-19至-32克碳/平方米·年之间）。甲烷通量在总碳流出量中所占比例非常小（<2%）。在我们这片自然恢复的沼泽地中，经过相对较短的20年时间，植被的恢复有利于碳固存。
