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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

Branching number (means ± SE, n = 5) and shoot diameter (means ± SE, n = 5) of Myriophyllum spicatum with different fragment size growing in two densities and two sediment types.
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f2: Branching number (means ± SE, n = 5) and shoot diameter (means ± SE, n = 5) of Myriophyllum spicatum with different fragment size growing in two densities and two sediment types.

Mentions: Branching number differed significantly with fragment size, plant density, and sediment type (Table 1; Fig. 2), and was greater in the mud treatments compared to the sand treatments. In the mud treatments, branching number increased with decreasing plant density and increasing fragment size. The highest branching number occurred in the low density +12 cm fragment + mud treatment (3.87 ± 0.72; Fig. 2), and was 58 times higher than the lowest branching number in the high density +12 cm fragment + sand treatment (0.07 ± 0.05; Fig. 2).


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)

Branching number (means ± SE, n = 5) and shoot diameter (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

f2: Branching number (means ± SE, n = 5) and shoot diameter (means ± SE, n = 5) of Myriophyllum spicatum with different fragment size growing in two densities and two sediment types.
Mentions: Branching number differed significantly with fragment size, plant density, and sediment type (Table 1; Fig. 2), and was greater in the mud treatments compared to the sand treatments. In the mud treatments, branching number increased with decreasing plant density and increasing fragment size. The highest branching number occurred in the low density +12 cm fragment + mud treatment (3.87 ± 0.72; Fig. 2), and was 58 times higher than the lowest branching number in the high density +12 cm fragment + sand treatment (0.07 ± 0.05; Fig. 2).

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