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首页> 外文学位 >Spatial relationships of carbon dioxide exchange in an upland forested wetland complex in the Western Boreal Plain, Alberta, Canada.
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Spatial relationships of carbon dioxide exchange in an upland forested wetland complex in the Western Boreal Plain, Alberta, Canada.

机译：加拿大艾伯塔省西部北方平原上的高地森林湿地综合体中二氧化碳交换的空间关系。

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摘要

This study examined the midday (10:00--16:00) growing season (April--October) surface cover CO2 relationships with different canopy closures and microtopography (lawn and depression) in a forested upland-peatland-pond complex in the Western Boreal Plain, north-central Alberta, Canada. A dynamic-closed chamber technique was used to: evaluate the relative contributions of heterotrophic and autotrophic respiration and photosynthesis and assess the relative roles of substrate, plant communities, hydrology, and microclimates on CO2 exchange.; Large differences were observed among the forest floors of landscape units with different canopy covers with respect to midday total respiration (Rtot= vegetation respiration (Rveg) + soil respiration (Rsoil)) and gross ecosystem production (GEP), and the seasonal pattern of GEP and Rtot. Highest rates of Rtot followed the general progression of riparian > upland > open peatland > covered peatland, with high Rsoil contributions. Strong correlations were observed between C:N, soil temperature, moisture and Rtot. Photosynthetic Active Radiation (PAR) controlled GEP, which was highest in the open and covered peatland. GEP and Rtot were highest in the middle of the growing season when soil and air temperatures were warmest, in addition Rveg contributed more to Rtot during this time, however R soil dominated the flux.; Small differences were observed between lawn and depression sites in terms of net ecosystem CO2 exchange (NEE). The general trend was for warmer, drier lawn sites to have higher GEP and Rtot than the topographically lower, cooler and wetter depressions. The moisture and temperature differences between microtopography drove differences in the productivity of species but did not drive differences in vegetation distribution.; This study demonstrated that degrees of spatial and seasonal temporal variability as well as controlling environmental factors on CO2 exchange cannot necessarily be extrapolated to a sub-humid region, such as Canada's Western Boreal Plain. In addition, forest floors of different land cover units, and microtopography should be taken into account when discussing understory contributions to CO2 exchange.
机译：这项研究研究了西部山区森林-高原-池塘-池塘复合体中生长季节的中午（10：00--16：00）生长季节（四月至十月）与不同冠层关闭和微观地形（草坪和洼地）的表层CO2关系加拿大艾伯塔省中北部的北方平原。动态封闭室技术用于：评估异养和自养呼吸作用和光合作用的相对贡献，以及评估底物，植物群落，水文学和微气候对CO2交换的相对作用；在中午总呼吸（Rtot =植被呼吸（Rveg）+土壤呼吸（Rsoil））和生态系统总产量（GEP）以及GEP的季节性模式方面，观察到具有不同冠层的景观单元的森林地板之间存在很大差异。和Rtot。 Rtot的最高发生率沿河岸>高地>开阔的泥炭地>覆盖的泥炭地的一般进展，具有较高的Rsoil贡献。在C：N，土壤温度，湿度和Rtot之间观察到强烈的相关性。光合作用主动辐射（PAR）控制的GEP，在开放和覆盖的泥炭地中最高。 GEP和Rtot在生长季节的中期最高，此时土壤和空气温度最高，此外，Rveg在此期间对Rtot的贡献更大，但R土壤主导了通量。就净生态系统二氧化碳交换量（NEE）而言，在草坪和洼地之间观察到很小的差异。总的趋势是，温暖，干燥的草坪地带的GEP和Rtot高于地形上较低，凉爽和湿润的洼地。微观形貌之间的水分和温度差异推动了物种生产力的差异，但并未驱动植被分布的差异。这项研究表明，空间和季节时变的程度以及控制CO2交换的环境因素不一定能推断到亚湿润地区，例如加拿大的西部北方平原。此外，在讨论林下对二氧化碳交换的贡献时，应考虑不同土地覆盖单位的森林地面和微观地形。

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  • 作者

    Solondz, Danielle M.;

  • 作者单位

    Wilfrid Laurier University (Canada).;

  • 授予单位 Wilfrid Laurier University (Canada).;
  • 学科 Physical Geography.; Atmospheric Sciences.
  • 学位 M.E.S.
  • 年度 2008
  • 页码 119 p.
  • 总页数 119
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然地理学;
  • 关键词

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