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首页> 外文期刊>Lesnicky casopis >Substitution of Norway spruce for Douglas-fir: changes of soil microbial activities as climate change induced shift in species composition a?? a case study
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Substitution of Norway spruce for Douglas-fir: changes of soil microbial activities as climate change induced shift in species composition a?? a case study

机译：Douglas-FIR的替代挪威云杉：土壤微生物活动的变化作为气候变化诱导物种组成的变化a ??案例研究

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Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) is the most common utilized introduced tree species in the tem-is the most common utilized introduced tree species in the temperate zone, planted in many European countries. Also, in the Czech Republic it represents the most planted exotic species as well. Its planted area exceeds 6,000 ha and represents 0.25% of the forest area of the country. In the last years, this species is supposed as convenient substitution for declining Norway spruce (Picea abies [L.] Karst.) stands under current climatic change (extreme drought, bark beetle outbreak). The changed species composition affects also soil dynamic processes, including litter decomposition and transformation. In the presented study, the respiration rate and nitrification intensity were compared in the stand parts dominated by Norway spruce and Douglas-fir in comparable site conditions (410 m a.s.l., 650 mm, 8 ?oC, gleyic Luvisol, fresh oak-fir site with Oxalis acetosella, age 97 years). Analyses were performed in laboratory conditions by standard methods determining actual (basal) and potential respiration activity and intensity of ammonia and nitrate ion production. Admixture of Douglas-fir considerably intensified decomposition activities (soil respiration) and profoundly increased the nitrification rate in the surface humus and uppermost mineral soil layer a?? Ah horizon. Increased interest in the Douglas-fir silviculture needs increased care for forest soil dynamics with respect of nitrogen balance.
机译：Douglas-FIR（Pseudotousuga menziesii [MiRB。] Franco）是TEM中最常见的介绍的树种 - 是在许多欧洲国家种植的温带区中最常见的利用树种。此外，在捷克共和国，它也代表了最多种植的异国情调。其种植面积超过6000公顷，占该国森林面积的0.25％。在过去的几年中，该物种被认为是挪威云杉拒绝的方便替代（Picea Abies [L.]喀斯特。）受当前气候变化（极端干旱，树皮甲虫爆发）。改变的物种组成也会影响土壤动态过程，包括凋落物分解和转化。在提出的研究中，将呼吸速率和硝化强度进行比较，在可比较的位点（410米ASL，650毫米，8Ωoc，Greyic Luvisol，新鲜的橡树 - FIR网站中，呼吸零件oxalis acetosella，年龄97岁）。通过标准方法在实验室条件下进行分析，所述标准方法测定实际（基础）和潜在的呼吸活性和氨和硝酸根离子产生的强度。道格拉斯·雷的混合物显着加剧了分解活动（土壤呼吸），深刻增加了表面腐殖质和最上面的矿物土层A的硝化率啊Horizo​​ n。增加道格拉斯 - 冷杉造林的兴趣需要增加对氮气平衡的森林土壤动力学的影响。

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