. Bulletin. Science; Natural history; Natural history. 76 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES Q. Q. < CO _J o CO _l < H H CO DC LU. 1979 1980 1981 1982 1983 Fig. 2. Catastrophic iiooding in January and February 1980 lowered the salinity of cordgrass soils. Brackish conditions have not recurred since the "hundred-year" flood. Data for this transect (TJE- 31, n = 13 stations) provide the longest record of soil salinity. depth. Soil salinity measurements began in March 1979 at Transect TJE-31 (Fig. 2). The salinity minimum occurred in April and the maximum in September. Beginn
. Bulletin. Science; Natural history; Natural history. 76 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES Q. Q. < CO _J o CO _l < H H CO DC LU. 1979 1980 1981 1982 1983 Fig. 2. Catastrophic iiooding in January and February 1980 lowered the salinity of cordgrass soils. Brackish conditions have not recurred since the "hundred-year" flood. Data for this transect (TJE- 31, n = 13 stations) provide the longest record of soil salinity. depth. Soil salinity measurements began in March 1979 at Transect TJE-31 (Fig. 2). The salinity minimum occurred in April and the maximum in September. Beginning in fall 1979, all transects were monitored in April and September of each year. In September 1979, the elevation of each quadrat was measured, using a Wild Automatic Level referenced to Army Corps of Engineers benchmarks. At the same time, soil samples were collected in 250-ml cans to obtain soil moisture (loss on drying), bulk density (weight of dry soil/volume), and soil organic matter (loss on ignition at 500°C in a muffle furnace). Soil oxygen content was assessed in buried test tubes (after Boggie 1977). Plastic tubes (45 ml, perforated and lined with Teflon) were filled with a 35 ppt solution of Instant Ocean, stoppered, and buried in the top 10 cm of soil at each sampling station. One week later, the oxygen content of the solution was measured in situ with a YSI oxygen electrode. Soil temperature was read from the YSI thermister in the above solution. Competition Experiments The possible influence of competitive interactions was suggested by a negative relationship between cordgrass and cover of other species. A field experiment was designed to test the hypothesis that the succulent vegetation (primarily Salicornia virginica L. with some Batis maritima L.) reduced cordgrass density and 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
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