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Extra resources for Aquatic Vegetation and Its Use and Control
Time-tablesare then constructed for these observations,which show clearly the change in dominance of different species during the season, the response of the community to environmental changes (including weed-controltreatments), and the seasonal behaviour of individual species. 4). After each flight, the recordings were compared and a map compiled,which reflected the average results of all observers. These was probably an inherent error in these estimations of about 10 per cent,but the greater accuracy that could be obtained by an aerial photographic survey was not justified because a considerable variation in weed area can be caused in a short while by changes in wind slrength and direction.
Minima because the former produces larger leaf areas in the same light intensities during the same period of time. The growth of E'ichhorniu crussipes has been measured by Bock (1969), who measured increase in wet weight and increase in plant numbers,at varying intervals from April to June and from April to October, during the growing season in California. 8per cent per day). 9per cent per day). 9per cent per day for the whole period. Penfound & Earle (1948) recorded the increase in number of plants from offshoots in Eiclzlzorniu crussipes between March and June in experimental pits.
Exponential biological growth has been shown to be of the mathematical form: or where , 'A is the initial size,X,is the size after period,t, and K is the rate of growth; In = log,. Growth of this type occurs when the material afded contributesto the growth potential of the organism. Thus, the sizes of growth increments increase 39 D. S. Mitchell within equal time periods,as growth continues,and it is more realistic to calculate relative growth rate (RGR),which is defined as the increase of material per unit of material present per unit of time,rather than growth rate (GR),which is simply the increase of plant material per unit of time and does not take into account the quantity of material present.
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