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[Physiological Characteristics and Nitrogen and Phosphorus Uptake of Myriophyllum aquaticum Under High Ammonium Conditions].
- Source :
-
Huan jing ke xue= Huanjing kexue [Huan Jing Ke Xue] 2017 Sep 08; Vol. 38 (9), pp. 3731-3737. - Publication Year :
- 2017
-
Abstract
- Ammonium nitrogen (NH <subscript>4</subscript> <superscript>+</superscript> -N) at high concentrations is toxic to plants. In order to explore the NH <subscript>4</subscript> <superscript>+</superscript> -N tolerance of Myriophyllum aquaticum ( M. aquaticum ) and its ability of nitrogen (N) and phosphorus (P) uptake, this study used a nutrient solution with three NH <subscript>4</subscript> <superscript>+</superscript> -N levels (70, 210, 420 mg·L <superscript>-1</superscript> ) to incubate M. aquaticum for 21 d. The characteristics of plant physiology and N and P uptake of M. aquaticum were measured. At NH <subscript>4</subscript> <superscript>+</superscript> -N of 70 mg·L <superscript>-1</superscript> , M. aquaticum grew healthily, and shoot height and biomass linearly increased with the increase incubation time. Relative shoot height and biomass of M. aquaticum were 40.56 cm and 17.82 g·hole <superscript>-1</superscript> on day 21, respectively. Compared to the control with 70 mg·L <superscript>-1</superscript> ammonium, malondialdehyde (MDA) content of M. aquaticum was significantly increased; chlorophyll and soluble sugar contents were also high at NH <subscript>4</subscript> <superscript>+</superscript> -N of 210 mg·L <superscript>-1</superscript> . M. aquaticum suffered from the NH <subscript>4</subscript> <superscript>+</superscript> -N stress. However, the stress of 210 mg·L <superscript>-1</superscript> NH <subscript>4</subscript> <superscript>+</superscript> -N did not affect its normal growth and there was no significant difference in the relative growth rate of the shoot height and biomass compared with the control. At NH <subscript>4</subscript> <superscript>+</superscript> -N of 420 mg·L <superscript>-1</superscript> , MDA contents of M. aquaticum doubled and the shoot height and biomass growth rate were only 27.4% and 17.9% of those for 70 mg·L <superscript>-1</superscript> NH <subscript>4</subscript> <superscript>+</superscript> -N, indicating that M. aquaticum was subjected to serious stress that caused unhealthy growth or even death. At three NH <subscript>4</subscript> <superscript>+</superscript> -N levels, the ranges of N and P content of M. aquaticum were 30.7-53.4 mg·g <superscript>-1</superscript> and 3.8-7.7 mg·g <superscript>-1</superscript> , respectively, which indicated that M. aquaticum had a high uptake capacity of N and P. M. aquaticum is an ideal wetland plant that has a good application prospect for constructed wetlands in biological treatment of high-ammonia wastewater.
Details
- Language :
- Chinese
- ISSN :
- 0250-3301
- Volume :
- 38
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Huan jing ke xue= Huanjing kexue
- Publication Type :
- Academic Journal
- Accession number :
- 29965253
- Full Text :
- https://doi.org/10.13227/j.hjkx.201701019