CSIRO Division of Tropical Crops and Pastures, Davies Laboratory, Private Bag, PO Aitkenvale, Qld 4814, Australia.
Factors contributing to the loss of seed from the seed-bank of Trifolium balansae and Trifolium resupinatum over summer
Article first published online: 28 JUL 2006
Australian Journal of Ecology
Volume 20, Issue 2, pages 248–256, June 1995
How to Cite
JANSEN, P. I. and ISON, R. L. (1995), Factors contributing to the loss of seed from the seed-bank of Trifolium balansae and Trifolium resupinatum over summer. Australian Journal of Ecology, 20: 248–256. doi: 10.1111/j.1442-9993.1995.tb00536.x
- Issue published online: 28 JUL 2006
- Article first published online: 28 JUL 2006
- Accepted for publication May 1994
- Trifolium balansae;
- Trifolium resupinatum
Abstract The influence of predation, fungi and germination of seed of the annual legumes Trifolium balansae and Trifolium resupinatum was investigated by placing known quantities of seed in bags in the field; combinations of all three factors were imposed. It was found that rainfall was the most important factor contributing to the loss of seed over summer (up to 76%), followed by predation (up to 15%); fungi had only a very small influence (0.1–0.2%). Predation contributed to a larger percentage of loss over summer in T. resupinatum line SA14433 than in T. balansae cv. Paradana, which is attributed to seed size. The effect of summer grazing on the size of the seed-bank was investigated. It was found that summer grazing did not influence the amount of seed present in the seed-bank in March. Removal of all surface material in December resulted in a significant drop in seed reserves compared with the ungrazed or grazed areas. Hardseededness in March was not affected by any of the treatments; the seedling density after regeneration was not affected by summer grazing, but was reduced when all surface material was removed. The data were incorporated in a model to describe seed loss from the seed bank over summer quantitatively; the utility of such models is discussed.