Comparative ecosystem–atmosphere exchange of energy and mass in a European Russian and a central Siberian bog II. Interseasonal and interannual variability of CO2 fluxes
Comparative ecosystem–atmosphere exchange of energy and mass in a European Russian and a central Siberian bog II. Interseasonal and interannual variability of CO2 fluxes
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俄罗斯欧洲沼泽和西伯利亚中部沼泽生态系统-大气能量和质量交换的比较 II。 CO2 通量的季节间和年际变化。
DOI：
10.3402/tellusb.v54i5.16684
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
E. Schulze
中科院分区：
文献类型：
--
作者：
A. Arneth;J. Kurbatova;O. Kolle;O. Shibistova;J. Lloyd;N. N. Vygodskaya;E. Schulze
摘要在1998年、1999年和2000年无雪期间，对两个北方沼泽的生态系统-大气CO2净交换（NEE）进行了测定。这两个地点分别位于俄罗斯欧洲部分（费奥多罗夫斯科耶）和西伯利亚中部（佐蒂诺）。这两个地点的气候一般都是大陆性的，但在更东部的佐蒂诺，夏季和冬季的温度梯度更大。费奥多罗夫斯科耶的无雪期比佐蒂诺的无雪期长了几个星期。在这两个地点，观察到显着的季节性和年际差异NEE，对比率和模式。其中最重要的对比是：（1）在参考土壤温度下的生态系统呼吸在Fyodorovskoye高于Zotino。(2)夏季NEE的日振幅在Fyodorovskoye比在Zotino大。(3)在平均降雨年，佐蒂诺的最大24小时NEE有一个适度的趋势，更负（-0.17对-0.15 mol m−2 d−1），这表明夏季的生产力更高。(4)在无雪期间的CO2累积净吸收量与年间气候差异密切相关。在佐蒂诺的气候年际变化，也在无雪期间的二氧化碳平衡，是小的。然而，在费奥多罗夫斯科耶沼泽是一个重要的碳汇在一个赛季和CO2-C的大量来源，这是低于平均干燥。总无雪吸收和净CO2-C吸收的年度估计进行了讨论，包括相关的不确定性。
Abstract Net ecosystem–atmosphere exchange of CO2 (NEE) was measured in two boreal bogs during the snow-free periods of 1998, 1999 and 2000. The two sites were located in European Russia (Fyodorovskoye), and in central Siberia (Zotino). Climate at both sites was generally continental but with more extreme summer–winter gradients in temperature at the more eastern site Zotino. The snow-free period in Fyodorovskoye exceeded the snow-free period at Zotino by several weeks. Marked seasonal and interannual differences in NEE were observed at both locations, with contrasting rates and patterns. Amongst the most important contrasts were: (1) Ecosystem respiration at a reference soil temperature was higher at Fyodorovskoye than at Zotino. (2) The diurnal amplitude of summer NEE was larger at Fyodorovskoye than at Zotino. (3) There was a modest tendency for maximum 24 h NEE during average rainfall years to be more negative at Zotino (−0.17 versus −0.15 mol m−2 d−1), suggesting a higher productivity during the summer months. (4) Cumulative net uptake of CO2 during the snow-free period was strongly related to climatic differences between years. In Zotino the interannual variability in climate, and also in the CO2 balance during the snow-free period, was small. However, at Fyodorovskoye the bog was a significant carbon sink in one season and a substantial source for CO2-C in the next, which was below-average dry. Total snow-free uptake and annual estimates of net CO2-C uptake are discussed, including associated uncertainties.