An assessment of the importance of emergent and floating-leaved macrophytes to trophic status in the Loosdrecht lakes (The Netherlands)

Abstract

The potential importance of the six major emergent and floating-leaved macrophyte species in recycling of sediment phosphorus in the Loosdrecht lakes was studied. Representative plant samples were collected at the time of maximum biomass, and analysed for biomass and carbon, nitrogen and phosphorus contents . Species cover was determined by aerial photography .Total cover in the seven lakes studied ranged between 2 and 26 percent . For the four main species, biomass per unit area increased with lake trophic status . Consistent differences in C, N and P contents per unit biomass were not observed . Although cover values were small, significant amounts of C, N and • were contained in the macrophytes when compared with maximum sestonic content .Potential P loads from macrophyte decay were calculated . In Lake Loosdrecht, the P load represented 15 percent of current external P inputs . The potential importance of macrophyte decay to P recycling in the other lakes is greater .Decay of macrophyte species at the end of the growing season appears to affect autumnal nutrient and chlorophyll a levels in the water column of some lakes . The re-establishment of submerged species following lake restoration may increase the importance of this pathway in the lakes .

Estimating Net Primary Productivity and Nutrient Stock in Plant in Freshwater Marsh, Northeastern China

“…1, Fig. 3 for N and 0.46-1.50 g kg À1 for P for the three species studied, these nutrient levels were similar to those recorded in previous studies for N but much lower for P [32][33][34]. The nutrient accumulative value of aboveground and belowground parts of different wetland plants is obviously different [35,36].…”

Collecting in situ remote sensing reflectances of submersed macrophytes to build up a spectral library for lake monitoring

“…In addition, their use as indicator plants for the trophic state of a lake is well explored [Melzer, 1987;Malthus et al, 1990;Moss, 1990;Onaindia et al, 1996;Melzer, 1999]. Hence, the massive expansion of invasive macrophytes like Elodea nuttallii and Najas marina influences lake ecosystems in terms of habitat structures, water characteristics, biodiversity and nutrient cycles [Carignan and Kalff, 1980;Thomaz and da Cunha, 2010;Schultz and Dibble, 2012].…”

Development of floating-leaved vegetation in three lakes of varied trophy (Leczna-Wlodawa Lakeland)

“…Habitat conditions of nymphaeid associations were discussed by Szańkowski and Kłosowski (1999). Studies have also been conducted on the ecology of some nymphaeid species diverse in terms temperature conditions (Kraska 1988), as well as phenology, production and decomposition of floating leaves (van der Velde 1980;Malthus et al 1990).…”