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The effect of grazing intensity across spatial scales on plant species richness

Hofmann, M.; Sahin-Demirbag, N.; Isselstein, J. (2006)

Grassland Science in Europe 2006 (11), S. 495-497.


Monitoring grassland in Saxony – concept and first results

Franke, C.; Hofmann, M.; Riehl, G. (2006)

Verhandlungen der Gesellschaft für Ökologie, 2006.


Nährstoffbilanzen zur Prognose von Biodiversität auf beweidetem Grünland

Wrage, N.; Sahin-Demirbag, N.; Röver, K.; Hofmann, M.; Isselstein, J. (2006)

Mitteilungen der Gesellschaft für Pflanzenbauwissenschaften 18, 2006, S. 308–309.


Zeitliche Verteilung von Nährstoffen auf beweidetem Grünland: Nährstoffverarmung durch Weidehaltung?

Wrage, N.; Sahin-Demirbag, N.; Röver, K.; Hofmann, M.; Isselstein, J. (2006)

Mitteilungen der Arbeitsgemeinschaft für Grünland und Futterbau, Band 8, 2006, S. 221-224.


Grünland-Dauerbeobachtungsflächen in Sachsen – Ergebnisse aus 11 Jahren

Franke, C.; Hofmann, M.; Riehl, G. (2006)

Mitteilungen der Arbeitsgemeinschaft für Grünland und Futterbau, Band 8, 2006, S. 180-183.


Heterogenität des Futterangebotes auf extensiver Standweide

Sahin-Demirbag, N.; Röver, K.; Hofmann, M.; Isselstein, J. (2006)

Herausgeber: Walz, O.P., Deutsch-Türkische Agrarforschung | 8. Symposium vom 4. bis 8. Oktober 2005 an der Bundesforschungsanstalt für Landwirtschaft (FAL), Braunschweig, S. 431–434.


Grünland-Dauerbeobachtungsflächen in Sachsen – Ergebnisse aus 11 Jahren

Franke, C.; Hofmann, M.; Riehl, G. (2006)

Info-Dienst 12/2006, S. 68-73.


Was bedeutet die Managementplanung in einem FFH-Gebiet für die Landwirtschaft?

Hofmann, M. (2006)

Veranstaltungen für landwirtschaftliche Nutzer bzw. Öffentliche Informationsveranstaltung im Rahmen der FFH-Managementplanung. 43 Veranstaltungen an verschiedenen Orten in Sachsen, April 2006 – Dezember 2007.


Effects of livestock breed and grazing intensity on biodiversity and production in sustainable grazing systems

Hofmann, M.; Rook, A.; Dumont, B.; Isselstein, J.; Mills, J.; Osoro, K.; Scimone, M....

Vortrag, General Meeting of the European Grassland Federation, Badajoz/Spain.


Grünlandbewirtschaftung im Ökologischen Landbau − Aspekte und Visionen

Hofmann, M. (2006)

Probevorlesung an der FH Eberswalde im Rahmen des Berufungsverfahrens auf die Professur ´Grünlandsysteme und Futterbau´, 2006.


Species enrichment in an agriculturally improved grassland and its effects on botanical composition, yield and forage quality

Hofmann, M.; Isselstein, J. (2005)

Grass and Forage Science 60 (2), S. 136-145.
DOI: 10.1111/j.1365-2494.2005.00460.x

 

In a field experiment, the effects of different management treatments on the botanical development and productivity of a previously species‐poor, intensively managed, lowland permanent grass sward were investigated over a 4‐year period. Fertilizer inputs were stopped and nine main treatments, based on three pre‐sowing and three post‐sowing cutting regimes, were applied. Half of each treatment plot was oversown with a mixture of forb (wildflower) species and half left unsown. The aims were: (1) to investigate the effect of cutting regimes on the establishment of introduced forb species, (2) to assess the development and dry‐matter (DM) yield potential of these introduced species, and (3) to compare the DM yield and forage quality of swards with and without introduced species. Seedling establishment was recorded until the end of the second year. From the third year onwards, a common twice‐yearly cutting regime was imposed on all treatments, and the development of the introduced species was recorded. The DM yield of the nine oversown sub‐treatments was compared with the sub‐treatments not oversown. Frequent cutting after oversowing resulted in the greatest number of established plants and three times greater harvested DM yield of introduced species, compared with infrequent cutting. Plantago lanceolata and Trifolium pratense were the best performing introduced species. By years 3 and 4, there was proportionately 0·15 and 0·23, respectively, additional herbage DM yield harvested from the oversown treatments compared with unsown treatments, and up to 0·60 more in some treatments. The introduction of forbs increased the crude protein concentration, but decreased the digestibility of the forage.

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The effect of sheep grazing at two stocking rates on the seedling recruitment of grassland forbs

Isselstein, J.; Kowarsch, N.; Bonn, S.; Hofmann, M. (2005)

Herausgeber: O'Mara, F.P., Wilkins. R.J., ´t Mannetje, L., Rogers, RAM., Boland, T.M., XX International Grassland Congress. Wageningen Academic Press, Wageningen 2005 (625).


Spatial and temporal dimensions of plant species diversity on cattle grazed pasture

Hofmann, M.; Sahin-Demirbag, N.; Isselstein, J. (2005)

Mitteilungen der Arbeitsgemeinschaft für Grünland und Futterbau, Band 7, 2005, S. 22-25.


Graseverhalten und Selektivität weidender Ochsen auf extensiver Standweide

Röver, K.; Sahin-Demirbag, N.; Hofmann, M. (2005)

Mitteilungen der Arbeitsgemeinschaft für Grünland und Futterbau, Band 7, 2005, S. 49-52.


Untersuchungen zur Pflanzenartenvielfalt auf extensiver Standweide mit Fleischrindern

Sahin-Demirbag, N.; Hofmann, M.; Röver, K.; Isselstein, J. (2005)

Mitteilungen der Arbeits-gemeinschaft für Grünland und Futterbau, Band 7, 2005, S. 259-262.


Räumliche und zeitliche Aspekte der pflanzlichen Artenvielfalt auf einer Standweide mit Rindern

Hofmann, M. (2005)

Vortrag, Jahrestagung der Arbeitsgemeinschaft für Grünland und Futterbau, Bad Elster/Deutschland, 2005.


Erhöhung der Artenvielfalt im Wirtschaftsgrünland – botanische und agronomische Aspekte

Hofmann, M. (2004)

Vortrag im Rahmen des Kolloquiums Pflanzenproduktion, Universität Kiel, 3. November 2004.


Effects of drought and competition by a ryegrass sward on the seedling growth of a range of grassland species

Hofmann, M.; Isselstein, J. (2004)

Journal of Agronomy and Crop Science 190 (4), S. 277-286.
DOI: 10.1111/j.1439-037X.2004.00117.x

 

In de‐intensified grassland where an increased seedling recruitment is seen as a prerequisite to enhance plant species diversity, establishment success of introduced seeds of wildflower species is often poor. Outshading by the existing sward and dry weather spells when seedlings are at an early stage of development are major reasons for a low seedling establishment. The effects of drought and competition by an existing Lolium perenne sward on the growth of seedlings of seven wildflower species were investigated under standardized environmental conditions. Without competition (control), the relative growth rate of the wildflower seedlings varied between 103 (Tragopogon pratensis) and 184 mg g−1 day−1 (Leontodon autumnalis). Species differed in the extent of growth reduction by competition. Compared with the control, reduction of seedling dry weight ranged from 45 % (Trifolium pratense) up to 88 % (Daucus carota). The time range between onset of desiccation and first effects on growth varied between species, with T. pratense showing early and strong growth reduction in contrast to D. carota being least affected. It can be concluded, that those species which maintain a comparatively high growth rate supported by adapted shoot‐root allocation are most promising for establishment in grassland as they can exploit profiles of higher resource availability.


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Seedling recruitment on agriculturally improved mesic grassland: The influence of disturbance and management schemes

Hofmann, M.; Isselstein, J. (2004)

Applied Vegetation Science 7 (2), S. 193-200.
DOI: 10.1111/j.1654-109X.2004.tb00610.x

 

Question: Are the recruitment patterns of deliberately introduced wildflower species influenced by cutting frequencies and disturbance treatments? To what extent do these different treatments affect productivity and sward structure of an agriculturally improved grassland? Location: A mesic lowland grassland near Göttingen, Lower Saxony, Germany. Methods: Recruitment success of eight sown wildflower species was studied in a permanent grassland treated by a factorial combination of different pre-sowing cutting intervals (1, 3 or 9 wk), post-sowing cutting intervals (1,3 or 9 wk) and disturbance (control, harrowing, removal of sward). Seedling emergence and survival, biomass production and sward structure were followed over two years. Results: For most species seedling emergence was highest in the harrowing treatment. The complete sward removal did not further increase seedling emergence. Seedling survival was strongly influenced by the post-sowing cutting frequency with highest mortality in the 9 wk cutting interval compared to one and 3 wk cutting intervals. Annual dry matter yield varied between 4.4, 5.9 and 9.4 t.ha-1 in the 1,3 and 9 wk pre-sowing cutting treatment, respectively. In June, when the seeds were sown, the tiller number of the 1 wk cut plots was twice as high as for the 9 wk cut plots and five times higher than in the harrowing treatment. Conclusions: Disturbance by harrowing provided the optimal environmental cues to trigger germination, whereas seedling survival was facilitated by increased light penetration due to frequent cutting. The investigation revealed the overriding importance of frequent standing crop removal in the early phase of seedling establishment on agriculturally improved grassland.

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Spatial and temporal aspects of sward structure on a continuously stocked, botanically diverse pasture

Hofmann, M.; Tallowin, J. (2004)

Grassland Science in Europe 2004 (9), S. 235-238.


Prof. Dr. Martina Hofmann


Hochschule Weihenstephan-Triesdorf

Fakultät Nachhaltige Agrar- und Energiesysteme
Am Staudengarten 1
85354 Freising

T +49 8161 71-4340
martina.hofmann[at]hswt.de