. Bulletin. Science; Natural history; Natural history. 116 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES MATURE BURNED MONOCOTS DICOTS. lllllllllllllll- 5°C 23°C DAYS IIIIIIIIIIIIIB- 5°C 23°C Fig. 1. Rate of germination of monocots and dicots from soils collected from mature chaparral and an adjacent two year bum. this was not a complication. As will be seen below, germination of Cryptantha muricata did not differ on the two soils yet a separate test showed it was sensitive to elevated osmotic pressure; germination was reduced from 77% ( = 12, N = 3) in distilled water controls to 24% ( = 7)
. Bulletin. Science; Natural history; Natural history. 116 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES MATURE BURNED MONOCOTS DICOTS. lllllllllllllll- 5°C 23°C DAYS IIIIIIIIIIIIIB- 5°C 23°C Fig. 1. Rate of germination of monocots and dicots from soils collected from mature chaparral and an adjacent two year bum. this was not a complication. As will be seen below, germination of Cryptantha muricata did not differ on the two soils yet a separate test showed it was sensitive to elevated osmotic pressure; germination was reduced from 77% ( = 12, N = 3) in distilled water controls to 24% ( = 7) in M mannitol. Dicot seedling emergence from mature soils was significantly increased by all treatments, including the supposedly "allelopathic" leachate treatments (Table 1). Charate produced significantly greater germination than any other treatment; sixteen dicot species emerged from these plates: 51% were herbs, largely Descu- rainia pinnata, Camissonia hirtella, Gnaphalium californicum and the remaining 49% were nearly all Adenostoma fasciculatum. From the second year bum soil, dicot germination was much greater than from the mature chaparral soil and no treatment increased germination over controls. No shrub seedlings emerged from these soils though many of the herb species were the same as those from the mature soil. Addition of charate to this soil significantly reduced germination. Monocot seeds were rare in mature chaparral soil but abundant in burned chaparral soil. These seeds were essentially all from grasses, largely Bromus tec- torum and Festuca megalura. Heat reduced germination of these grasses in both Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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