Germination and Seedling Establishment in California Annual Grassland

摘要: (1) Data for plant density, germinable seed in the soil, and production annual grassland were obtained at Hopland Field Station, California, U.S.A., 1973 1974. The study combined indirect estimates of numbers germination soil samples containing natural seed, estimation density. (2) Autumn patterns establishment differed significantly between two years. Plant density increased through autumn, reaching peaks 261 8 345*3 plants per dM2 seventh week after began, 1974 respectively. (3) top 6.4 cm prior to start growing season 6705 6102 1974, thus showed little difference (4) Comparison depletion seed-bank increase that seeds germinating first produced fewer established seedlings than second or third weeks. few remaining fifth sixth weeks had a high probability successful establishment. (5) Six species-groups exhibiting contrasting strategies are discussed detail.