Distribution and decomposition dynamics of herb plants in Pengxihewater-fluctuation-zone of the Three Gorges Reservoir

Abstract

Abstract: Repeated random sampling method was used to survey herb plants in the Pengxihe Water-fluctuation-zone of Three Gorges Reservoir. With the litterbag method, the decomposition rates of herb plants were studied for 94 consecutive days. The results showed that the cover indexes of herb plants ranged from 50％ to 90％. Within 94 days the decomposition rates of herb plants ranged from 0.073 to 0.081 g/d with an average of 0.070 g/d. The dry mass loss of herb plant ranged from 78.35％ to 89.88％, an average of 82.49％. Invertebrates were also collected and there were 21 species belonging to 20 genera, 10 families and 9 orders. After litterbags had been submerged for 2, 6, 11, 17, and 94 days, the average density of invertebrates were 27, 80, 37, 114 and 300 ind/m² respectively. At the same time, the average biomasses of invertebrates were 0.299 2, 0.307 8, 0.065 7, 0.315 4 and 0.225 7 g/m².

CLC Number:

Q948.15⁺5

ZHANG Zhi-yong, PENG Jian-hua, WAN Cheng-yan, ZHENG Zhi-wei, QIU Deng-gao. Distribution and decomposition dynamics of herb plants in Pengxihewater-fluctuation-zone of the Three Gorges Reservoir[J]. Acta Prataculturae Sinica, 2010, 19(2): 146-152.

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