. Bulletin. Science; Natural history; Natural history. WATER RELATIONS OF BROMUS DIANDRUS 61 n 3 g> Q. February Fig. 5. Growth of Bromus diandrus through the course of the growing season. The function is Y = + - + where Y is weight (grams) and x is time during the growing season (days) (r2 = ). uniformly high through the course of the growing season. Nevertheless, RWC declined and by the end of the experiment, less than 10% of the plants in the canopy cover were green. Water, including subsurface soil moisture, and moderate winter tempe
. Bulletin. Science; Natural history; Natural history. WATER RELATIONS OF BROMUS DIANDRUS 61 n 3 g> Q. February Fig. 5. Growth of Bromus diandrus through the course of the growing season. The function is Y = + - + where Y is weight (grams) and x is time during the growing season (days) (r2 = ). uniformly high through the course of the growing season. Nevertheless, RWC declined and by the end of the experiment, less than 10% of the plants in the canopy cover were green. Water, including subsurface soil moisture, and moderate winter temperatures regulate growth through the season as earlier modeled (Pen- dleton et al. 1983), but the life cycle ends shortly after inflorescence maturation. This may be independent of water status of the soil and merely natural senescence of the plant. Growth Growth of Bromus diandrus is clearly weather sensitive. Pitt and Heady (1978) reported a range in cover of the grass from a mean of from 1955-1975 to a high of in 1957 at the Hopland Field Station in the central portion of the coastal mountains, Mendocino County, California. In general, growth followed a sigmoid function (Fig. 5). The polynomial which best fits our dry weight data is: Y - + - + (r2 = ) where Y is weight (grams) and x is time during the growing season (days). While the model predicts near exponential increase in growth, in fact, dry weight is expected to plateau (dashed line) since leaves are dry, flowering is complete, and there is little evidence of growth in the few remaining live plants. This classic growth curve (Leopold and Kriedemann 1975) corroborates the tiller growth of Bromus mollis and Avena barbata reported by Ewing and Menke (1983). They also reported an extended early period of slow growth followed by rapid Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - c
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