N and P Purification in Aquatic Water with Three Plants

doi:10.11924/j.issn.1000-6850.casb18090140

Abstract

Abstract:

To study the suitable plants for N and P purification in aquatic water, Eichhornia crassipes, Spirodela polyrrhiza and Ipomoea aquatica were selected as test subjects. The biomass gradients were set up. The water samples were taken once every 5 days. The indexes of N and P such as TN, NO₃ ^-, NO₂ ^-, NH₄ ⁺-N and TP in aquatic water were determined and analyzed. The effects of different plants, biomass gradients and experimental time on N and P purification were studied. The results showed that the three plants grew normally and had good purification capacity for N and P in aquatic water. The three plants had better effect on N purification in 10-15 days, and on P purification in 15-20 days. The biomass of Eichhornia crassipes, Spirodela polyrrhiza and Ipomoea aquatica with the best purification effect on N and P was 2000-2500 g/m ³, 150-200 g/m ³ and 800-1600g/m ³, respectively. All the three kinds of plants can be used to purify N and P of aquatic water, the order of the purification effect on TN, TP, NO₃ ^- was Ipomoea aquatica > Spirodela polyrrhiza > Eichhornia crassipes, while on NO₂ ^-、NH₄ ⁺-N was Eichhornia crassipes> Ipomoea aquatica > Spirodela polyrrhiza. Eichhornia crassipes is more suitable for the purification of N and P in aquatic water.

Key words: Eichhornia crassipes, Spirodela polyrrhiza, Ipomoea aquatica, N, P, water purification

CLC Number:

Yu Zhenhai, Chen Youguang, Lu Hong, Zheng Yuzhen, Liu Hongcai, Sun Hua. N and P Purification in Aquatic Water with Three Plants[J]. Chinese Agricultural Science Bulletin, 2020, 36(5): 131-137.

Figures/Tables 5

References 21

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