Der Begriff »Lernen« im Kontext des K.U.R-Konzepts

Peters, Bianca

doi:10.1007/978-3-662-55478-4_4

Cited by 2 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For each study site, we selected 12 to 23 ash trees of varying health status (Table 1), which were easy to reach with a lifting platform. The health status of the trees was classi ed according to a scoring system for ash trees affected by ash dieback (Peters et al 2021). Class 0 represents a healthy tree without any infection symptoms and no disease-associated leaf loss.…”

Section: Study Areasmentioning

confidence: 99%

Does the health condition of the common ash tree affect its pollen viability?

Kahlenberg,

Buchner,

Jochner-Oette

et al. 2024

Preprint

View full text Add to dashboard Cite

Pollen viability plays a crucial role in reproduction. Given the enormous threat posed to the common ash (Fraxinus excelsior L.) by ash dieback, it is important to investigate the disease's effects on pollen viability and germination. Thus, we conducted an analysis of these pollen characteristics across three distinct forest stands in southern Bavaria, with a maximum of 23 ash trees per study site. These ash trees exhibited varying degrees of ash dieback-related damage symptoms, enabling us to assess differences between mildly and severely affected trees (via Mann-Whitney-U/Wilcoxon test). Pollen viability was assessed using the TTC test, while pollen germination capacity was evaluated using a sucrose agar solution. Our findings revealed no significant differences in pollen viability between healthy and diseased trees, as indicated by both the TTC test and pollen germination assay. However, a tendency towards higher pollen viability was observed in healthier, more robust ash trees across both methods. Non-significant differences, however, suggest that ash trees can produce viable pollen necessary for successful fertilisation irrespective of their health status. Nonetheless, it was observed that severely diseased trees were linked to less inflorescences, as the severely diseased or dead shoots produced few to no flowers. Consequently, the likelihood of pollen from severely diseased trees fertilising other ash trees is substantially diminished. In conclusion, it is evident that flower and pollen production are most important in the reproductive ecology of ash trees.

show abstract

Section: Study Areasmentioning

confidence: 99%

Does the health condition of the common ash tree affect its pollen viability?

Kahlenberg,

Buchner,

Jochner-Oette

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Additionally, we assessed plot BB1 in Brandenburg in the winter of 2024. The basis for these scores was the assessment key for ash trees, which was developed at the beginning of the project (Peters et al 2021a;Peters et al 2021b). We analyzed winter assessments of the IBF with particular focus on stem collar necrosis.…”

Section: Optical and Acoustic Assessment (Scoring)mentioning

confidence: 99%

“…Each plot has a core area of one hectare and contains at least 30 adult ash trees with a wide range of vitality and regeneration (Langer et al 2022). The health of all ash trees at IBF is visually assessed twice a year from the ground, starting in 2021, using the developed ash dieback assessment key (Peters et al 2021b;Peters et al 2021a).…”

Section: Introductionmentioning

confidence: 99%

Comparative studies on the identification and assessment of basal stem necrosis in ash trees (Fraxinus excelsior) against the backdrop of the European ash dieback

Häuser,

Hauswald,

Kätzel

2024

Preprint

View full text Add to dashboard Cite

This study deals with ash monitoring data collected by the FraxForFuture research network on 14 intensive monitoring plots across Germany. It focuses on the phenomenon of ash dieback in Germany. As basal stem necrosis has been identified as the main cause of ash dieback and uprooting, early detection is essential. To this end, this study investigated three different methods for detecting stem collar necrosis, which we applied simultaneously and compared in the intensive monitoring plot in Brandenburg. We assessed a cohort of 1,572 ash trees distributed across the 14 plots six times over a three-year period using a nationally standardized ash dieback assessment key. In addition, we assessed 29 ash trees on the Brandenburg plot using a resistograph. Of these trees, we subjected 19 to intensive biochemical analysis. These methods were then evaluated and compared. Our analysis of the scores shows significant variation in the incidence and progression of basal stem necrosis across Germany. Comparison with the resistograph indicates limitations in the detection of severe necrosis by scoring alone. Biochemical analysis highlights the effect of necrosis on soluble carbohydrate and total phenolic content, with soluble amino acids also implicated. As ash dieback progresses, ash trees, which are often severely damaged in the canopy, need to be thoroughly assessed at the base of the trunk to limit damage and minimise loss of value.

show abstract

Der Begriff »Lernen« im Kontext des K.U.R-Konzepts

Cited by 2 publications

References 36 publications

Does the health condition of the common ash tree affect its pollen viability?

Does the health condition of the common ash tree affect its pollen viability?

Comparative studies on the identification and assessment of basal stem necrosis in ash trees (Fraxinus excelsior) against the backdrop of the European ash dieback

Contact Info

Product

Resources

About