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| Diversity of Aquatic Plants in Drainage Ditches in the Yellow River Irrigated Area of Ningxia |
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| KeyWord:aquatic plant; species and community diversity; agricultural drainage ditches; Yellow River irrigated area; Ningxia |
| Author Name | Affiliation | | LUO Liang-guo | Institute of Agricultural Environment and Development, CAAS；Key Lab of Agricultural Environment, MOA, Beijing 100081, China | | ZHAO Tian-cheng | Ningxia Academy of Agriculture and Forestry, Yinchuan 750002, China | | LIU Rui-liang | Ningxia Academy of Agriculture and Forestry, Yinchuan 750002, China | | WANG Yan | Institute of Agricultural Economics and Sustainable Development, CAAS, Beijing 100081, China | | ABE Kaoru | Japan National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba 305-8604 |
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| Abstract: |
| Aquatic plants in agricultural drainage ditches have been considered to play important roles in purifying nitrogen and phosphorus in ditch water. Here we investigated composition and diversity of aquatic plants in agricultural drainage ditches in the Yellow River irrigated area of Ningxia. Representative branch ditches, sub-branch ditches and grooves around farmland were selected for quadrate surveying. An area of 1 m×1 m was set at the upper，middle，and lower reaches of each drainage ditch. In each quadrate, plant name, biomass, height, coverage and abundance of each species were recorded. In the investigated area, aquatic plants consisted of 20 species, representing 13 genera and 11 families．The widespread plant species were Phragmites australis（Cav.） Trin. ex Steud. , Scirpus triqueter L. , Juncellus serotinus（Rottb.） C. B. Clarke , Juncellus serotinus（Rottb.） C. B. Clarke , Potarmogeton pectinatus L. and Potamogeton natans L. Plant communities had obvious vertical stratification in the drains. Plant species and community diversity were significantly different among drainage ditches, with groove>sub-branch ditch>branch ditch. The depth and flow rate of water in the drains were the main factors influencing aquatic plant morphology and distribution. Unlike branch and sub-branch ditches, grooves had slow water flow and stable environment, facilitating growth of various plants. Therefore, grooves could be used to control nonpoint pollution from farmlands. |
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