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Colonization by fragments of the submerged macrophyte Myriophyllum spicatum under different sediment type and density conditions.

Li F, Zhu L, Xie Y, Jiang L, Chen X, Deng Z, Pan B - Sci Rep (2015)

Bottom Line: Both branching number and shoot diameter increased with decreasing density and increasing fragment size, and were significantly higher in the mud than the sand treatments.Total N content in both the shoot and root was significantly higher in the mud and low-density treatments than in the sand and high-density treatments.Shoot P content only decreased with increasing density, while root P content was higher in the mud and low-density treatments than in the sand and high-density treatments.

View Article: PubMed Central - PubMed

Affiliation: 1] Key Laboratory of Agro-ecological Processes in Subtropical Region, The Chinese Academy of Sciences, Hunan 410125, China [2] Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture, Changsha 410125, China [3] Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Ministry of Education, 541004, China.

ABSTRACT
In this paper, the effect of plant density, sediment type, and macrophyte fragment size on the fragment colonization ability of Myriophyllum spicatum was evaluated in an outdoor experiment. The relative growth rate (RGR) was higher in the mud and low-density treatments than in the sand and high-density treatments. The relative elongation rate (RER) decreased with increasing density and fragment size, with RER values being much higher in the mud than the sand treatments. Both branching number and shoot diameter increased with decreasing density and increasing fragment size, and were significantly higher in the mud than the sand treatments. The shoot : root ratio was higher in the mud treatments than in the sand treatments. Total N content in both the shoot and root was significantly higher in the mud and low-density treatments than in the sand and high-density treatments. Shoot P content only decreased with increasing density, while root P content was higher in the mud and low-density treatments than in the sand and high-density treatments. These data indicate that fragment colonization by M. spicatum is improved by large fragments, low density, and nutrient-rich sediments, and that these conditions contribute to the rapid population expansion of this species.

No MeSH data available.


Related in: MedlinePlus

Relative growth rate (means ± SE, n = 5) and relative elongation rate (means ± SE, n = 5) of Myriophyllum spicatum with different fragment size growing in two densities and two sediment types.
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f1: Relative growth rate (means ± SE, n = 5) and relative elongation rate (means ± SE, n = 5) of Myriophyllum spicatum with different fragment size growing in two densities and two sediment types.

Mentions: The RGR of M. spicatum was significantly influenced by plant density and sediment type, rather than fragment size (Table 1; Fig. 1), and decreased with increasing plant density in the mud treatment. In contrast, plant density had an insignificant effect on RGR in the sand treatment. RGR was much higher in the mud treatment compared to the sand treatment. The highest RGR occurred in the low plant density +12 cm fragment + mud treatment (0.029 ± 0.00 g g−1 day−1). This value was 1.80 times higher than the lowest RGR, which occurred in the high plant density + 12 cm fragment + sand treatment (0.016 ± 0.00 g g−1 day−1; Fig. 1).


Colonization by fragments of the submerged macrophyte Myriophyllum spicatum under different sediment type and density conditions.

Li F, Zhu L, Xie Y, Jiang L, Chen X, Deng Z, Pan B - Sci Rep (2015)

Relative growth rate (means ± SE, n = 5) and relative elongation rate (means ± SE, n = 5) of Myriophyllum spicatum with different fragment size growing in two densities and two sediment types.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4488764&req=5

f1: Relative growth rate (means ± SE, n = 5) and relative elongation rate (means ± SE, n = 5) of Myriophyllum spicatum with different fragment size growing in two densities and two sediment types.
Mentions: The RGR of M. spicatum was significantly influenced by plant density and sediment type, rather than fragment size (Table 1; Fig. 1), and decreased with increasing plant density in the mud treatment. In contrast, plant density had an insignificant effect on RGR in the sand treatment. RGR was much higher in the mud treatment compared to the sand treatment. The highest RGR occurred in the low plant density +12 cm fragment + mud treatment (0.029 ± 0.00 g g−1 day−1). This value was 1.80 times higher than the lowest RGR, which occurred in the high plant density + 12 cm fragment + sand treatment (0.016 ± 0.00 g g−1 day−1; Fig. 1).

Bottom Line: Both branching number and shoot diameter increased with decreasing density and increasing fragment size, and were significantly higher in the mud than the sand treatments.Total N content in both the shoot and root was significantly higher in the mud and low-density treatments than in the sand and high-density treatments.Shoot P content only decreased with increasing density, while root P content was higher in the mud and low-density treatments than in the sand and high-density treatments.

View Article: PubMed Central - PubMed

Affiliation: 1] Key Laboratory of Agro-ecological Processes in Subtropical Region, The Chinese Academy of Sciences, Hunan 410125, China [2] Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture, Changsha 410125, China [3] Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Ministry of Education, 541004, China.

ABSTRACT
In this paper, the effect of plant density, sediment type, and macrophyte fragment size on the fragment colonization ability of Myriophyllum spicatum was evaluated in an outdoor experiment. The relative growth rate (RGR) was higher in the mud and low-density treatments than in the sand and high-density treatments. The relative elongation rate (RER) decreased with increasing density and fragment size, with RER values being much higher in the mud than the sand treatments. Both branching number and shoot diameter increased with decreasing density and increasing fragment size, and were significantly higher in the mud than the sand treatments. The shoot : root ratio was higher in the mud treatments than in the sand treatments. Total N content in both the shoot and root was significantly higher in the mud and low-density treatments than in the sand and high-density treatments. Shoot P content only decreased with increasing density, while root P content was higher in the mud and low-density treatments than in the sand and high-density treatments. These data indicate that fragment colonization by M. spicatum is improved by large fragments, low density, and nutrient-rich sediments, and that these conditions contribute to the rapid population expansion of this species.

No MeSH data available.


Related in: MedlinePlus