Publication Date
1985
Location
Kyoto Japan
Description
To study the changes of population structure in.an establishing sward of timothy, we carried out the field experiment, and the demography and the spatial distribution of timothy plants for about a half year. Plants decreased at expotential rate and the cohort of seedlings emerging until July was dominant at the last recording date. The frequency distribution of individual tiller number shifted to more right-skewed as plants grew. Large plants were liable to survive to the succeeding recording dates, and there were positive correlated relationship in the individual tiller number between recording dates, especially high between October and November (r=0.93). Plant distributions were aggregate in early recording date but became random as time passed, and at the final recording date large plants were distributed more randomly than small ones. These results suggest that ecological regulations operate on the frequency distributions of plant size and the spatial distribution in a sward. Also, these suggest that the dominance and suppression relationships among members develop rapidly within a sward population.
Citation
Sawada, H; Takahashi, T; and Tsuda, Ch, "The Changes of Population Structure of Timothy (Phleum pratense L.) in an Establishing Sward" (1985). IGC Proceedings (1985-2023). 119.
(URL: https://uknowledge.uky.edu/igc/1985/ses6/119)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
The Changes of Population Structure of Timothy (Phleum pratense L.) in an Establishing Sward
Kyoto Japan
To study the changes of population structure in.an establishing sward of timothy, we carried out the field experiment, and the demography and the spatial distribution of timothy plants for about a half year. Plants decreased at expotential rate and the cohort of seedlings emerging until July was dominant at the last recording date. The frequency distribution of individual tiller number shifted to more right-skewed as plants grew. Large plants were liable to survive to the succeeding recording dates, and there were positive correlated relationship in the individual tiller number between recording dates, especially high between October and November (r=0.93). Plant distributions were aggregate in early recording date but became random as time passed, and at the final recording date large plants were distributed more randomly than small ones. These results suggest that ecological regulations operate on the frequency distributions of plant size and the spatial distribution in a sward. Also, these suggest that the dominance and suppression relationships among members develop rapidly within a sward population.
