Seasonal Changes in Height, Biomass and Biomass Allocation of Two Exotic Aquatic Plants in a Shallow Eutrophic Lake

Liu, Chunhua; Wu, Gang; Yu, Dan; Wang, Dong; Sheng-Lin, Xia

doi:10.1080/02705060.2004.9664510

Cited by 14 publications

(4 citation statements)

References 9 publications

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“…The growth pattern of water hyacinth in the Nile Delta was similar to that of the same species in Brazil (Greco & Freitas ), Mexico (Gutiérrez et al ), the USA (Akbay et al ) and China (Liu et al ). In the Nile Delta, the total biomass of water hyacinth reached peak values in August, which differs from the study of Center and Spencer (), who reported that the total biomass of water hyacinth growing in Lake Alice (Florida, USA) peaked in mid‐June and gradually declined thereafter.…”

Section: Discussionsupporting

confidence: 62%

Population dynamics of Eichhornia crassipes (C. Mart.) Solms in the Nile Delta, Egypt

Eid

Shaltout

2016

Plant Species Biology

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The present study aims to evaluate the growth and seasonal allocation of the biomass of water hyacinth (Eichhornia crassipes) under natural conditions in the south Mediterranean region (the Nile Delta, Egypt). In this study, the population characteristics (density, morphology and primary production) over a one-growing-season cycle were described. In the Nile Delta, the biomass of the shoot and root systems of E. crassipes was sampled monthly along three water courses from April 2014 to November 2014 using five quadrats (each of 0.5 m × 0.5 m) at each water course. The shoot system started to grow in April (121 g/DM/m 2 ), reached a maximum biomass of 887 g/DM/m 2 in July, and then decreased until reaching a minimum of 299 g/DM/m 2 in November. The biomass of the root system increased from 75 g/DM/m 2 in April to a maximum of 235 g/DM/m 2 in August and decreased to a minimum of 100 g/DM/m 2 in November. Water hyacinth allocated ca. 2% of its total biomass to stolons, 22% to laminae, 24% to roots and 52% to petioles. Peak density as high as 144 individual/m 2 occurred in May, but it reduced to 33-50 individual/m 2 during July to November. The average rate of change of biomass was maximum (17.3 g/DM/m 2 /day) during April and May and minimum (−8.9 g/DM/m 2 / day) during October and November. Relative growth rates were found to be lowest during the cooler months, October and November (−0.017 g/DM/g /day), whereas highest yields were recorded during the spring months, April and May (up to 0.044 g/DM/g/ day). The correlation coefficients between the water characteristics and the first two canonical correspondence analysis axes indicated that the separation of the population parameters of water hyacinth along the first axis was negatively influenced by Zn. On the other hand, the second axis was positively correlated with electric conductivity, total N, total P, Mg, Na, K and Mn and negatively with pH.

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Section: Discussionsupporting

confidence: 62%

Population dynamics of Eichhornia crassipes (C. Mart.) Solms in the Nile Delta, Egypt

Eid

Shaltout

2016

Plant Species Biology

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“…Seasonality is a key environmental factor that governs plant functional traits such as canopy height (e.g. Liu et al, 2004), stem diameter (e.g. this study, Singh et al, 1990) and shoot density (e.g.…”

Section: Species-specific Differences In Seasonality May Explain Diffmentioning

confidence: 92%

Biomechanical properties of marsh vegetation in space and time: effects of salinity, inundation and seasonality

2019

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• Background and Aims Over the last decade, the importance of plant biomechanical properties in shaping wave dissipation efficiency of marsh vegetation has gained growing attention. Here we provide the first analyses of how biomechanical stem properties vary with seasons and along environmental gradients in coastal and estuarine marshes, which is essential to enable accurate assessments of flood defence value of marsh vegetation. • Methods We quantified both spatial and seasonal variation in stem flexibility and breakability for a variety of common marsh vegetation (Spartina anglica, Scirpus maritimus, Phragmites australis, Elymus athericus, Suaeda maritima, Aster tripolium, Saliconia procumbens) distributed along both salinity and inundation gradients. • Key Results Increasing salinity tends to induce a shift from species with tall shoots, high flexural stiffness (stem resistance to bending; N mm 2) towards species with shorter and more flexible stems. The same trend was found with increasing inundation stress (i.e. decreasing elevation) from the higher part of the low marsh towards the pioneer zone. Stem breakability (the force required to break or fold a stem, N) followed the same pattern of stem stiffness due to the positive relationship between flexural strength (material resistance to flexure, N mm −2) and Young's bending modulus (material resistance to bending; N mm −2). Shifts in stem stiffness and breakability at the community level were found to relate positively to the variation in canopy height between species, highlighting the concurrence of changes in morphological and biomechanical traits under environmental changes. Compared to the differences between species, within-species variability between sampling locations and between seasons is generally minor. • Conclusions Our findings imply that environmental changes may significantly modify wave attenuation capacity of coastal vegetation by inducing species shifts. This emphasizes the need to understand the response of community composition to climate change and human disturbances, when using nature-based flood protection by coastal vegetation as an adaptive response to global change.

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“…In addition, the eutrophication of both freshwater and coastal marine systems causes a wide array of undesirable symptoms that are directly or indirectly to the nuisance growth of aquatic plants, such as algal blooms, water transparency decrease, depletion of deep water oxygen, biodiversity reduction and others (Smith and Schindler 2009). Since 1960s, there were so many publications which investigated the relationship between nutrients and eutrophication and technological tools which control nitrate and phosphate (Liu et al 2004;Wen and Recknagel 2002;Smolders et al 2006). And, major advances in the scientific understanding and management of eutrophication have been made (Schindler 2006).…”

Section: Introductionmentioning

confidence: 99%

A bibliometric study of the trend in articles related to eutrophication published in Science Citation Index

Huang

Wang

2011

Scientometrics

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A keyword analysis was applied in this work to evaluate research trends of eutrophication papers published between 1991 and 2010 in any journal of all the subject categories of the Science Citation Index compiled by Institute for Scientific Information, Philadelphia, USA. Eutrophication was used as a keyword to search parts of titles, abstracts, or keywords. The published output analysis showed that eutrophication research steadily increased over the past 20 years and the annual publication output in 2008, 2009, 2010 were about four times that of 1991. The whole paper published by China ranked at 3rd, but these papers' IF were lower than the average of the world. ''Water Framework Directive'' and ''Life Cycle Assessment'' were two of the most frequently used author keywords in the period between 1999 and 2010 whilst they did not appear before 1998. These new conception indicated eutrophication research trend was changing to policy and management from technological researches.

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Seasonal Changes in Height, Biomass and Biomass Allocation of Two Exotic Aquatic Plants in a Shallow Eutrophic Lake

Cited by 14 publications

References 9 publications

Population dynamics of Eichhornia crassipes (C. Mart.) Solms in the Nile Delta, Egypt

Population dynamics of Eichhornia crassipes (C. Mart.) Solms in the Nile Delta, Egypt

Biomechanical properties of marsh vegetation in space and time: effects of salinity, inundation and seasonality

A bibliometric study of the trend in articles related to eutrophication published in Science Citation Index

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