By Laura Foster Huenneke (auth.), L. F. Huenneke, Harold A. Mooney (eds.)
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Extra resources for Grassland structure and function: California annual grassland
Most valid estimates show that there is a huge over-production of seeds by the dominant annual species far in excess of the number required to renew a given community. The excess seed production must fuel losses due to seed predation during the summer dormant period or sustain the population in dry years. Generally, the rule of thumb is that at least twice the germinable seeds exist before the first fall rain as plants that existed per unit area in the previous community or will become established in the next community.
Begg (1968) and Gowans (1967) also provided data on the clay content of these soils, and on the closely associated characteristic, water-holding capacity. Percent clay content in the surface and subsoil horizons of the five soils, respectively, were 51 and 55% for Sehorn soils; 26 + 106 6102 66 106666 6 6 . 6 zlsL;... J ~ 0 ~ -, -, -4~----~=---+-----~---4-----+----~----+-----~--~--~ -, -2 DISCRIMINANT SCORE I (STANDARD DEVIATIONS) Fig. 7. , Taeniatherum asperum, and Erodium botrys) for 10 sites (five soil series, wooded and open), plotted along two discriminant function continua.
Terrestrial Vegetation in California, pp. 733-760. New York, J. Wiley. Howell JT (1947) Further studies of broad-leaf Erodium in California, Leaflets of Western Botany 5(4), 67-68. Howell JT (1952) Mineral King and some of its plants, Leaflets of Western Botany 6(11), 212-219. Howell JT (1970) Marin Flora, 2nd edition. Berkeley, Univ. of Calif. Press. Huffaker CB, ed. (1971) Biological Control. New York, Plenum. Jackson LE (1985) Ecological origins of California's mediterranean grasses, J. Biogeography 12, 349-361.
Grassland structure and function: California annual grassland by Laura Foster Huenneke (auth.), L. F. Huenneke, Harold A. Mooney (eds.)