关键词: 沙生植物, 老鼠艻, 演化阶段, 水势

Abstract: The understory birds in Xishuangbanna, Yunnan is characterized of higher species richness and lower species density compared to South China, where the Greycheeked Fulvetta (Alcippe morrisonia) is the most dominant species. To explore whether characteristics of understory birds in other areas of Yunnan are the same as in Xishuangbanna, and assess how topography impacts the understory bird community, we sampled birds in the evergreen broadleaved forests of Daweishan, southeast Yunnan and Jizushan, northwest Yunnan using mist nets from November 2011 to September 2012. The two sites are on the east of Red River Fault Zone. A total of 735 individuals from 52 species, 13 families and 3 orders were captured within 5614 net hours at Daweishan, and a total of 413 individuals from 45 species, 15 families and 2 orders were captured within 4731 net hours at Jizushan. Our results showed that species diversities of Daweishan and Jizushan communities were lower than that of monsoon evergreen broadleaved forest of Mengyang, Xishuangbanna; dominant species, especially the grey-cheeked fulvetta, accounted for a higher proportion in Daweishan and Jizushan than in Mengyang; as regard to resident species, Daweishan and Jizushan communities had high similarity but were quite different from Mengyang community; more migratory individuals were caught in Daweishan and Jizushan communities than in Mengyang community. We concluded that Red River Fault Zone had a significant impact on the understory bird community compositions by a comprehensive analysis of natural geography of Daweishan, Jizushan and Mengyang, as well as their bird community compositions.

Key words: Spinifex littoreus, succession period., psammophyte, water potential