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• W2354865303 abstract "Reed ( Phragmites communis ), one of the intrazonal plants, is a dominant or constructive species in the wetland communities and widely distributes all over the world. The ground water depth plays important roles in the formation of reed biomass and its population dynamics. The relationship between the structural component biomass of reed population and ground water depth was investigated using Pearson correlative analysis in order to reveal how reed responses to changes of ground water depth in the desert oasis. The results show as follows: The population densities, height, aboveground biomass, ratio of root to canopy are significantly correlated with ground water depth. Their Pearson correlation coefficients are -0 686,0.883,0.690,and -0 647,respectively. Population density decreases with increasing ground water depth. Specifically,there is a dramatic decrease at the 1.5m depth below and a steady reduce at the upwards of 1.5m. However, population height increases with increasing ground water depth. There is a steady increase when the depth is less than 1.2m, and there is a dramatic increase when the depth is more than 1.2 m. Above ground biomass also increases with increasing depth generally, with a slight rise when the depth is less than 1.2 m and a fluctuating increase when the depth is more than 1.2 m. Although the change in the ratio of root to canopy appears complex with the ground water depth, it shows a dramatic decrease with increasing at 2 0m depth below and a steady reduction at the upwards of 2 0m. In addition, the density and underground biomass of reed population appear the highest and its aboveground biomass exhibits the lowest at the habitats studied with under|groundwater burying less than 0 5m. The peak of aboveground biomass appears at the habitat with groundwater burying about 1 5m. Aboveground biomass is affected by vertical rhizome due to its hydraulic lift. The effective degree increases with increasing ground water depth. For instance, the effective degree is extremely significant ( P 0 01) at the habitat with the depth less than 1.5m, and significant ( P 0 1) at the habitat with that between 1 5～4.0m. However, it is insignificant ( P 0.1) at the habitat where the ground water depth is more than 4.0m. This finding illustrates that the height of hydraulic lift of vertical rhizome of reed is less than 4.0m in the area investigated. So the conclusion can be drawn that aboveground biomass of reed population is randomly affected by the horizontal rhizome. It might be the primary reason why reed population usually shows patchy and discontinuous pattern distribution." @default.
• W2354865303 created "2016-06-24" @default.
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• W2354865303 date "2003-01-01" @default.
• W2354865303 modified "2023-09-25" @default.
• W2354865303 title "Relationship between structural component biomass of reed population and ground water depth in desert oasis" @default.
• W2354865303 hasPublicationYear "2003" @default.
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