Modeling growth dynamics of Typha domingensis (Pers.) Poir. ex Steud. in Lake Burullus, Egypt

Seasonal allocation of carbohydrates between above‐ and below‐ground organs of Typha domingensis

“…A similar pattern of WSC and TNC in T. angustifolia rhizomes was reported in Japan by Asaeda et al (2008). The June-July drop in WSC, starch and TNC concentrations, reported in the present study, can probably be attributed to a coincident growth of new lateral shoots and heavy flowering buds formation (Eid et al 2012c). The finding was comparable to the results of Linde et al (1976), who reported that the heavy flowering puts an additional drain on the carbohydrates reserves in T. angustifolia.…”

“…Comparing the absolute maximum values of the carbohydrates concentrations in T. domingensis , as estimated in the present study, with those of T. angustifolia in Japanese stands, it seems that T. domingensis stands have lower values especially for rhizomes. This pattern may be a strategy of T. angustifolia to store more assimilates in below‐ground rhizomes in the temperate zone compared with T. domingensis in the south Mediterranean zone, where photosynthesis is not a limiting factor for biomass production due to high radiation and a longer growth period (Eid et al ).…”

“…This pattern may be a strategy of T. angustifolia to store more assimilates in below-ground rhizomes in Table 3. Results of Tukey HSD test for monthly variation in the water-soluble carbohydrates (WSC), starch and total nonstructural carbohydrates (TNC) contents (g m −2 ) in organs of Typha domingensis in Lake Burullus (Egypt) during one growing season (February-October 2014 E. M. Eid and K. H. Shaltout Feddes Repertorium 2016, 127, 55-64 the temperate zone compared with T. domingensis in the south Mediterranean zone, where photosynthesis is not a limiting factor for biomass production due to high radiation and a longer growth period (Eid et al 2012c). In T. domingensis, the carbohydrates contents (g m −2 ) reveal the contribution of component organs to the overall carbohydrates production of the population, and emphasize the increase in carbohydrates production during the growing season.…”

“…Many studies were carried out on T. domingensis such as nutrients and heavy metals cycling (Eid et al ), phytoremediation (Hegazy et al ), productivity (Eid et al ), modeling the growth dynamics (Eid et al. ), flooding stress (Chen et al ), restoration (Newman et al ), and distribution (Khedr , Khedr and El‐Demerdash ). According to the authors' knowledge, so far no published studies have been carried out to identify potential physiological weaknesses in the growth of T. domingensis based on seasonal carbohydrates allocation patterns.…”

Verification of a numerical growth model of Pistia stratiotes L. using field data from tropical and subtropical sites

“…Because no initial shoots or roots biomass was reported, a series of simulations were conducted using different initial shoots and roots biomass values, and the value that provided the best fit of the simulated biomass to the actual biomass (from the two published field studies) was then used (Table 1). The deviations of the simulated results from the observed field data were assessed in three ways: standard deviation as a percent, regression of observed (y-axis) vs. simulated data (x-axis) and Wilcoxon signed-rank test (Pineiro et al 2008;Eid et al 2012). All the statistical analyses were carried out using Statistica 7.1 (Statsoft 2007).…”