Xiao W.,Administration of Jiuzhaigou National Scenic Area |
Jiang L.,Administration of Jiuzhaigou National Scenic Area |
Ge F.,Administration of Jiuzhaigou National Scenic Area |
Zhu Z.,Administration of Jiuzhaigou National Scenic Area
Wetland Science | Year: 2015
The community of broad-leaf cattail (Typha latifolia) is the second largest plant community in Luweihai Lake, Jiuzhaigou, and it plays an important role in the ecological function and landscape function. After withering in winter, the aboveground part of Typha latifolia community accumulated in the lake, leading to rising of the lake bed, which finally results in lake-swapping. Studies on the effects of different harvest ratios of broad-leaf cattail on its growth and biomass showed that a quadratic regression model (γ =-11.68x2 + 130.94×-115.45, R2 = 0.986 3) with the month as its independent variable could be used to estimate the height of the broad-leaf cattail in Luweihai Lake during the plant growth period. The height of the plant ranged from 170-365 cm, average height being (266 ± 32) cm; the density of the community ranged from 17-40 individual/m2, the average density being (25 ± 5) individual/m2; the average individual aboveground-biomass was (34.82 ± 6.31) g, the biomass being (1 030.41 ± 163.44) g/m2. Artificial harvest treatment was good for broad-leaf cattail germination and early growth (from April to May), and it had no significant effect on late growth of the plant and the density of its population (from June to October). Harvest treatment in late autumn (late November) could reduce the amount of deposition of organic matter produced by broad-leaf cattail in Luweihai Lake, slowed the uplift rate of the lake bed.