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首页> 外文期刊>Environmental Pollution >The effect of nitrogen addition on biomass production and competition in three expansive tall grasses
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The effect of nitrogen addition on biomass production and competition in three expansive tall grasses

机译：氮肥对三种膨胀高草的生物量生产和竞争的影响

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摘要

A large increase of grasses Calamagrostis epigejos, Bromus inermis and Brachypodium pinnatum has often been observed in many regions enriched by higher nitrogen (N) wet deposition inputs. Competitive relationships between these grasses under enhanced N loads have not yet been studied. Therefore an outdoor experiment was established which involved monocultures of Calamagrostis, Bromus and Bra chypodium and their 1:1 mixtures in containers under two N treatments, i.e., unfertilized and fertilized (+50 kg N ha~(-1)). In monocultures, the total aboveground biomass of Calamagrostis, Bromus and Br chypodium were 1.1, 3.6 and 2.5 times higher respectively due to enhanced N fertilization. Relative crowding and aggressivity coefficients indicate that Calamagrostis and Bromus dominate when mixed with Brachypodium at both levels of N availability. When mixed with Bromus, Calamagrostis is the poorer competitor at lower N loads, however, it can be dominating in N fertilized treatments.
机译：在许多富含高氮（N）湿沉降输入的地区，经常观察到大量的禾本科香茅，无花布鲁姆草和短叶草。在增强的氮负荷下这些草之间的竞争关系尚未进行研究。因此，建立了一个室外实验，涉及在两个N处理（即未施肥和施肥（+50 kg N ha〜（-1）））下，在容器中对Cal蒲，布鲁莫斯和乳糜乳及其混合物的1：1混合物进行单一培养。在单一栽培中，由于提高了氮肥的施用，卡拉麦草，布鲁姆斯和胸腺乳杆菌的地上总生物量分别提高了1.1倍，3.6倍和2.5倍。相对拥挤系数和侵略性系数表明，在两个氮素有效利用水平上，与腕足动物混合时，鳞翅目和布鲁姆斯占主导地位。当与Bromus混合使用时，低氮负荷下的Calamagrostis是较差的竞争者，但是，在氮肥处理中它可能占主导地位。

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  • 来源
    《Environmental Pollution》 |2012年第11期|p.211-216|共6页
  • 作者

    Petr Holub; IvanTuma; Karel Fiala;

  • 作者单位

    Global Change Research Centre, Academy of Sciences of the Czech Republic, Belidla 4a, CZ-603 00 Brno, Czech Republic;

    Department of Agrochemistry, Soil Science, Microbiology and Plant Nutrition, Faculty of Agronomy, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czech Republic;

    Department of Vegetation Ecology, Institute of Botany, Academy of Sciences of the Czech Republic, Lidicka 25, CZ-602 00 Brno, Czech Republic;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    aboveground biomass; aggressivity; crowding coefficient; nitrogen; tall grasses;

    机译：地上生物量;侵略性拥挤系数氮;高高的草丛;

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