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首页> 外文期刊>Plant and Soil >Root trait responses of six temperate grassland species to intensive mowing and NPK fertilisation: a field study in a temperate grassland
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Root trait responses of six temperate grassland species to intensive mowing and NPK fertilisation: a field study in a temperate grassland

机译：六种温带草原物种对密集割草和NPK施肥的根系性状响应：在温带草原的田间研究

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摘要

Plant traits may characterize functional ecosystem properties and help to predict community responses to environmental change. Since most traits used relate to aboveground plant organs we aim to explore the indicative value of root traits. We examined the response of root traits (specific root length [SRL], specific root surface area [SRA], root diameter [RD], root tissue mass density [TMD], root N concentration) in six grassland species (3 grasses, 3 herbs) to four management regimes (low vs. high mowing frequency; no fertilization vs. high NPK fertilization). The replicated experiment in temperate grassland with long continuity simulated the increase in grassland management intensity in the past 50 years in Central Europe. Increasing mowing frequency (one vs. three cuts per year) led to no significant root trait changes. NPK fertilization resulted in considerable trait shifts with all species responding in the same direction (higher SRL, SRA and N concentration, lower TMD) but at different magnitude. Fertilization-driven increases in SRA were mainly caused by lowered tissue density while root diameter reduction was the main driver of SRL increases. We conclude that root morphological traits may be used as valuable indicators of environmental change and increasing fertilization in grasslands.
机译：植物性状可以表征生态系统的功能特性，并有助于预测社区对环境变化的反应。由于大多数使用的性状与地上植物器官有关，因此我们旨在探索根性状的指示性价值。我们研究了6种草地物种（3种草，3种草）的根系性状（比根长[SRL]，比根比表面积[SRA]，根直径[RD]，根组织质量密度[TMD]，根N浓度）的响应。草药）分为四个管理方案（低割草频率与高割草频率;不施肥与高NPK施肥）。在长期连续的温带草原上进行的重复实验模拟了中欧过去50年草地管理强度的增加。割草频率的增加（每年一割与三割）不会导致明显的根部性状变化。氮磷钾施肥导致相当大的性状变化，所有物种的响应方向相同（SRL，SRA和N浓度较高，TMD较低），但幅度不同。受精驱动的SRA增加主要是由于组织密度降低，而根径减小是SRL增加的主要驱动力。我们得出的结论是，根系形态特征可作为环境变化和增加草地施肥的有价值指标。

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