Theme 1-2: Rangeland/Grassland Ecology--Poster Sessions

Description

Orchardgrass is a high productive, highly nutritive grass, but its persistence is low under acid soil condition. Therefore, to obtain the information on the effect of soil acidity on the persistence of orchardgrass in acid soil grasslands, we investigated the relationship between exchangeable acidity (y1) and orchardgrass in sown pastures. Eight temperate pastures (four cutting meadows [CMs] and four cattle grazing pastures [GPs]) were used for vegetation survey and soil samplings. Six or three line transects (50 m each) were fixed in each meadow or pasture, and measurement location (three quadrats 20 cm×20 cm in size and 50 cm apart from each other) was set along the transect at a 10 m interval. The most dominant plant species was recorded after first cut of the meadows in 2018. Soil samples were collected in the area around quadrats, at depth of 0–5 cm for measurement of y1 and other chemical properties. Orchardgrass was dominated in 78% and 37% of CM and GP, respectively. Tall fescue (Festuca arundinacea) was also dominated in 2% and 22% of CM and GP, respectively. In CM, the locations with higher y1 showed a tendency of higher frequency of orchardgrass (P< 0.1) and significantly low frequency of tall fescue (P< 0.05). In contrast in GP, soil y1 did not show significant relationship to the frequency of orchardgrass and tall fescue. Soil chemical properties such as pH, NO3-N, K2O, CaO and MgO show negative relationship to y1 (P< 0.05) in CM or GP, although they did not show significant relationship to the frequency of orchardgrass. These results suggest that survival rate of orchardgrass increases with increase of y1, through preventing establishment of other plant species such as tall fescue under cutting condition, while this trend is not clear under grazing.

Share

COinS
 

Relationship between Exchangeable Acidity and Persistence of Orchardgrass (Dactylis glomerata) in Temperate Pastures under Different Management

Orchardgrass is a high productive, highly nutritive grass, but its persistence is low under acid soil condition. Therefore, to obtain the information on the effect of soil acidity on the persistence of orchardgrass in acid soil grasslands, we investigated the relationship between exchangeable acidity (y1) and orchardgrass in sown pastures. Eight temperate pastures (four cutting meadows [CMs] and four cattle grazing pastures [GPs]) were used for vegetation survey and soil samplings. Six or three line transects (50 m each) were fixed in each meadow or pasture, and measurement location (three quadrats 20 cm×20 cm in size and 50 cm apart from each other) was set along the transect at a 10 m interval. The most dominant plant species was recorded after first cut of the meadows in 2018. Soil samples were collected in the area around quadrats, at depth of 0–5 cm for measurement of y1 and other chemical properties. Orchardgrass was dominated in 78% and 37% of CM and GP, respectively. Tall fescue (Festuca arundinacea) was also dominated in 2% and 22% of CM and GP, respectively. In CM, the locations with higher y1 showed a tendency of higher frequency of orchardgrass (P< 0.1) and significantly low frequency of tall fescue (P< 0.05). In contrast in GP, soil y1 did not show significant relationship to the frequency of orchardgrass and tall fescue. Soil chemical properties such as pH, NO3-N, K2O, CaO and MgO show negative relationship to y1 (P< 0.05) in CM or GP, although they did not show significant relationship to the frequency of orchardgrass. These results suggest that survival rate of orchardgrass increases with increase of y1, through preventing establishment of other plant species such as tall fescue under cutting condition, while this trend is not clear under grazing.