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Safeguarding the rare woodland species Gagea spathacea : Understanding habitat requirements is not sufficient
Plant Species Biology ( IF 1.1 ) Pub Date : 2020-04-01 , DOI: 10.1111/1442-1984.12264 Andreas Fichtner 1 , Werner Härdtle 1 , Diethart Matthies 2 , Volker Arnold 3 , Alexandra Erfmeier 4, 5 , Tanja Hemke 6 , Doris Jansen 7 , Silke Lütt 8 , Marcus Schmidt 9 , Knut Sturm 10 , Goddert Oheimb 5, 11 , Bettina Ohse 1
Plant Species Biology ( IF 1.1 ) Pub Date : 2020-04-01 , DOI: 10.1111/1442-1984.12264 Andreas Fichtner 1 , Werner Härdtle 1 , Diethart Matthies 2 , Volker Arnold 3 , Alexandra Erfmeier 4, 5 , Tanja Hemke 6 , Doris Jansen 7 , Silke Lütt 8 , Marcus Schmidt 9 , Knut Sturm 10 , Goddert Oheimb 5, 11 , Bettina Ohse 1
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A large proportion of temperate forest plant diversity is found in the herb layer. However, for many of its species, little is known about their autecology, which makes it difficult to assess potential threats and efficiently safeguard the diversity of understorey herbaceous communities. This also applies to Gagea spathacea (Liliaceae), a globally rare spring geophyte, which mainly occurs in deciduous forests of northern Central Europe. We investigated the causal relationships between population characteristics of G. spathacea and abiotic site conditions across different forest communities in the center of its distributional range. Leaf length (a surrogate of the species' vegetative propagation) was positively related to soil moisture and soil nitrogen. Consequently, mean leaf length was highest in moist forest communities of the alliance Alno‐Ulmion. Moreover, mean variability in leaf length was lowest in those forests, indicating a higher and more stable vegetative propagation via bulbils. We found no support for a significant relationship between leaf length and leaf density or between leaf length and flower formation. Population density varied strongly among forest sites, but was not related to soil moisture and hardly influenced by soil nitrogen. Our results suggest that soil water and nutrient supply play a vital role in determining the species' vegetative propagation, whereas the duration of habitat continuity is most likely an important determinant of population size and density. Conservation strategies therefore require a better understanding of the complex interrelationships between abiotic site conditions and the historical context‐dependency of habitats.
中文翻译：
保护稀有林地物种 Gagea spathacea : 了解栖息地要求是不够的
在草本层中发现了很大比例的温带森林植物多样性。然而，对于它的许多物种，对其自身生态学知之甚少，这使得评估潜在威胁和有效保护林下草本群落的多样性变得困难。这也适用于Gagea spathacea（百合科），一种全球罕见的春季地质植物，主要生长在中欧北部的落叶林中。我们调查了 G. spathacea 种群特征与其分布范围中心不同森林群落的非生物立地条件之间的因果关系。叶长（该物种营养繁殖的替代物）与土壤水分和土壤氮呈正相关。最后，在 Alno-Ulmion 联盟的潮湿森林群落中，平均叶长最高。此外，这些森林中叶长的平均变异性最低，表明通过球茎进行的营养繁殖更高更稳定。我们发现没有支持叶长和叶密度之间或叶长和花形成之间的显着关系。不同林地的人口密度差异很大，但与土壤水分无关，几乎不受土壤氮的影响。我们的研究结果表明，土壤水分和养分供应在决定物种的营养繁殖方面起着至关重要的作用，而栖息地连续性的持续时间很可能是种群规模和密度的重要决定因素。
更新日期：2020-04-01
中文翻译：
保护稀有林地物种 Gagea spathacea : 了解栖息地要求是不够的
在草本层中发现了很大比例的温带森林植物多样性。然而，对于它的许多物种，对其自身生态学知之甚少，这使得评估潜在威胁和有效保护林下草本群落的多样性变得困难。这也适用于Gagea spathacea（百合科），一种全球罕见的春季地质植物，主要生长在中欧北部的落叶林中。我们调查了 G. spathacea 种群特征与其分布范围中心不同森林群落的非生物立地条件之间的因果关系。叶长（该物种营养繁殖的替代物）与土壤水分和土壤氮呈正相关。最后，在 Alno-Ulmion 联盟的潮湿森林群落中，平均叶长最高。此外，这些森林中叶长的平均变异性最低，表明通过球茎进行的营养繁殖更高更稳定。我们发现没有支持叶长和叶密度之间或叶长和花形成之间的显着关系。不同林地的人口密度差异很大，但与土壤水分无关，几乎不受土壤氮的影响。我们的研究结果表明，土壤水分和养分供应在决定物种的营养繁殖方面起着至关重要的作用，而栖息地连续性的持续时间很可能是种群规模和密度的重要决定因素。
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