• 研究报告 •

### 河套灌区九排域农田排水沟植物物种多样性

1. 中国科学院寒区旱区环境与工程研究所沙坡头沙漠研究试验站， 兰州 730000
• 出版日期:2011-12-08 发布日期:2011-12-08

### Plant species diversity in farmland drainage ditches in Hetao Irrigation Region, Inner Mongolia.

ZHAO Yang, WU Pan, HU Yi-gang, ZHANG Zhi-shan**

1. Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
• Online:2011-12-08 Published:2011-12-08

Abstract: In August and September 2010, a quantitative survey was conducted on the plant species in the farmland drainage ditches in the Ninth drainage area of Hetao Irrigation Region. One hundred and ten herbage plots with an area of 0.5 m × 0.5 m and thirteen shrub plots with an area of 5 m × 5 m were set at the bed and slope of the trenches in the upper-, mid-, and lower reaches of the main, feeder, and sub-feeder drainage ditches. A total of 39 species belonging to 38 genera and 17 families were found. Gramineae (n=10), Compositae (n=7), and Chenopodiaceae (n=4) were the largest families in the flora. The widespread plants species were Phragmites communis Trin., Leymus chinensis (Trin.) Tzvel., and Saussurea salsa (Pall.) Spreng. The Shannon index, richness Index, Pielou index, and Simpson index in the main drainage ditches were 0.57, 1.93, 0.37 and 0.81, those in feeder drainage ditches were 0.77, 3.46, 0.65 and 0.50, and those in sub-feeder drainage ditches were 0.90, 3.88, 0.64 and 0.53, respectively. The species diversity at slope was higher than that at bed, but the difference was not statistically significant between different size drainage ditches. Water retention time and dredging could be the main factors affecting the plant species diversity in the farmland drainage ditches in study area.