Jentsch, A; Friedrich, S; Beyschlag, W; Nezadal, W: Significance of ant and rabbit disturbances for seedling establishment in dry acidic grasslands dominates by Corynephorus canescens, Phytocoenologia, 32, 553-580 (2002)
Key words: bioturbation, patch dynamics, seedling establishment, succession
Abstract:
Seedling establishment is a crucial bottleneck for vegetation dynamics. However, little is known about the spatio-temporal patterns of small-scale disturbances offering bare substrate for germination, nor about the establishment rates of key pioneer species. This paper presents (i) temporal patterns of ant and rabbit disturbances in dry acidic grasslands dominated by Corynephorus canescens on inland sand dunes, and (ii) establishment rates of Corynephorus canescens, Spergula morisonii, Teesdalia nudicaulis and Rumex acetosella on disturbance patches versus undisturbed controls. Spatially explicit disturbance patterns of five sites – characterized by the associations Sper gulo morisoni i- Corynephoretum typicum and Spergulo mori soni i-Corynephore tum cl adonietosum – are recorded throughout 17 months at two scales (1 m ×1 m; 0.1 m ×0.1 m) in addition to plant establishment rates and cryptogam cover. A total of 1050 data records from 75 permanent plots is statistically analysed. Between 1% and 15% of the grasslands are covered by disturbance patches with a distinct seasonal pattern and limited longevity. For Corynephorus canescens, Spergula morisonii and Teesdalia nudicaulis, successful seedling establishment is significantly higher on small disturbed plots than on control plots, which are covered by cryptogams. Hence, these results provide evidence of the importance of small-scale disturbances as a window of opportunity for seedling establishment in dry acidic grassland. The findings are discussed with regard to the contribution of disturbance to the balance of grassland dynamics.
Upcoming ...


BayCEER Colloquium:
Th. 2021-01-14
Mineral surfaces and organic matter accrual in soils
Th. 2021-01-21
The impact of trees on soil organic carbon dynamics in the Subarctic - Priming effects and microbial N mining
Ecological-Botanical Garden:
Su. 2020-12-06
Entfällt: Führung nach Anmeldung: Zimt & Mandelkern: Pflanzen in der Weihnachtsbäckerei
Su. 2021-01-03
Führung nach Anmeldung: Mit kühlem Kopf ins Neue: Winterspaziergang
Geographisches Kolloquium:
Tu. 2020-12-08
People, pathogens, places: where medical geography meets disease ecology?
BayCEER Blog
13.01.2020
Why Science Communication?
24.05.2019
Stoichiometric controls of C and N cycling
07.05.2019
Flying halfway across the globe to dig in the dirt – a research stay in Bloomington, USA
16.04.2019
Picky carnivorous plants?
RSS Blog as RSS Feed
Weather research site
Luftdruck (356m): 949.8 hPa
Lufttemperatur: 0.9 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 5.9 km/h
Wind (Max.): 14.8 km/h
Windrichtung: SO

...more
Globalstrahlung: -2 W/m²
Lufttemperatur: -2.5 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 32m): 0.0 km/h

...more
This site makes use of cookies More information