Aboveground Biomass Allocation and Growth of Phragmites australis Ramets at Four Water Depths in the Jiuzhaigou Nature Reserve, China
- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF APPLIED & ENVIRONMENTAL BIOLOGY
- Issue:
- 2
- DOI:
- 10.3321/j.issn:1006-687X.2008.02.001
- Key Word:
- 芦苇;无性系分株;生物量分配;异速生长;繁殖;Phragmites australis;ramet;biomass allocation;allometric growth;reproduction
Abstract： The Jiuzhaigou Nature Reserve is a world natural heritage site in northern Sichuan, China, where an important wetland plant, Phragmites australis grows. The populations of P. australis from four different water depths in the Nature Reserve were compared for their aboveground biomass allocation, growth and reproduction of the single ramet. The results showed that the average aboveground biomass of a single ramet (4.2 g) was the largest in the habitat with water level of 47 cm above the soil surface. At the habitat with water level of 15 cm under soil surface (-15 cm), the leaf biomass percentage (of the total ramet biomass) was the largest (46.1%), and the height and percentage of ramose ramets (with branches on stem)(of the total ramets in a plot) were found obviously different. The deeper in water, the larger the biomass percentage and growth rate of stems were. The flowering rate and biomass of panicles were greater in shallow water than those in deep water. P. australis showed allometric growth for the height of ramets, and their biomass, stems and leaves by the power function. At the habitat with water level 15 cm under soil surface, the growth of leaf biomass was faster than that of stem biomass, and this was contrary to the growth at other water depths.
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