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Atmospheric and geogenic CO2 within the crown and root of spruce (Picea abies L. Karst.) growing in a mofette area
Atmospheric Environment ( IF 4.2 ) Pub Date : 2018-03-21
D. Vodnik, A. Thomalla, M. Ferlan, T. Levanič, K. Eler, N. Ogrinc, C. Wittmann, H. Pfanz

Mofettes are often investigated in ecology, either as extreme sites, natural analogues to future conditions under climate change, or model ecosystems for environmental impact assessments of carbon capture and storage systems. Much of this research, however, inadequately addresses the complexity of the gas environment at these sites, mainly focusing on aboveground CO2-enrichment. In the current research, the gaseous environment of Norway spruce (Picea abies (L) Karst.) trees growing at the Stavešinske slepice mofette (NE Slovenia) were studied by measuring both soil ([CO2]soil) and atmospheric CO2 concentrations ([CO2]air). Within the studied site (800 m2), soil CO2 enrichment was spatially heterogeneous; about 25% of the area was characterized by very high [CO2]soil (>40%) and hypoxic conditions. Aboveground gas measurements along vertical profiles not only revealed substantially elevated [CO2]air close to the ground (height up to 1.5 m), but also in the upper heights (20–25 m; crown layer). On the basis δ13C of CO2, it was shown that elevated CO2 relates to a geogenic source. Trees grown in high [CO2]soil were characterized by decreased radial growth; the δ13C of their wood was less negative than in trees growing in normal soil. Unfavorable gaseous soil conditions should generally be accepted as being by far the most important factor affecting (i.e. disturbing) the growth of mofette trees.



中文翻译:

云纹(云杉(Picea abies L.Karst。))的冠和根中生长的大气和地质CO 2

f鱼通常在生态学上进行研究,它们既可以作为极端场所,也可以作为气候变化下未来条件的自然类似物,也可以作为生态系统的模型来评估碳捕获和储存系统的环境影响。然而,许多研究并未充分解决这些地点的气体环境的复杂性,主要集中在地上CO 2的富集上。在目前的研究,挪威云杉的气体环境(云杉(L)卡斯特。)树木在Stavešinskeslepice mofette生长(NE斯洛文尼亚)通过测量两个土壤([CO研究2 ])和大气CO 2浓度( [CO 2 ]空气)。在研究地点内(800 m2),土壤CO 2富集在空间上是非均质的;大约25%的区域以[CO 2 ]高土壤(> 40%)和低氧条件为特征。沿垂直剖面进行的地上气体测量不仅显示出接近地面(高度高达1.5 m)的[CO 2 ]空气显着升高,而且还显示出较高高度(20–25 m;冠层)的空气。在此基础上δ 13 CO的Ç 2,它表明升高的CO 2涉及一种环境地球化学源。在高[CO 2 ]土壤中生长的树木的特征是径向生长减少;该δ 13与正常土壤中生长的树木相比,它们的木材中的C负值要小。到目前为止,通常认为不利的气态土壤条件是影响(即干扰)mo果树生长的最重要因素。

更新日期:2018-03-22
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