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Effects of salt-alkaline stress on functional traits of Scirpus nipponicus seedling *(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2020 01
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Effects of salt-alkaline stress on functional traits of Scirpus nipponicus seedling *
GU Yongbo1 2 CHEN Fangyuan1 BAI Jiangshan1 LOU Yanjing1** & TANG Zhanhui2**
1 Key Laboratory of Wetland Ecology and Environment/Jilin Provincial Joint Key Laboratory of Changbai Mountain Wetland and Ecology , Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
2 School of Environment, State Environmental Protection Key Laboratory for Wetland Ecology and Vegetation Restoration, Northeast Normal University, Changchun 130117, China
hygrophyte salt-alkaline stress functional traits biomass allocation

As one of the key environmental factors, salt-alkaline stress affects seedling establishment, growth and reproduction of hygrophyte in the salt-marsh ecology system. This paper aimed to understand the effects of salt-alkaline stress on growth traits and biomass allocation of Scirpus nipponicus seedling in Momoge National Nature Reserve . We conducted a common garden experiment with three levels of salinity (25, 100, and 200 mmol/L) and three levels of pH (7.79 ± 0.06, 9.42 ± 0.02, and 10.40 ± 0.01) treatments with one control treatment . The results are described as follows: salt-alkaline stress has a significant effect on the growth traits , biomass accumulation and biomass allocation of S. nipponicus seedling (P < 0.05). With salt-alkaline stress increasing, individual height, ramet number, tuber number, the biomass of root, rhizome, tuber, belowground, aboveground parts and total biomass all increased firstly and then decreased compared with control treatment . The optimum salinity concentration and pH is 25 mmol/L and 7.79 (± 0.06), respectively. The S. nipponicus seedling would not survive at the S3A3 (salinity and pH: 200 mmol/L and 10.40 (± 0.01), respectively) treatment. The effects of salt-alkaline stress on the root, rhizome, tuber biomass allocation and aboveground biomass allocation were all significant (P < 0.05). With salt-alkaline stress increasing, root and aboveground biomass allocation increased, tuber biomass allocation decreased. At 25 mmol/L salinity treatment, rhizome biomass allocation decreased, on the contrary, increased in other salinity treatments. Alkali stress is more severe than salt stress. The alkalization of soil is more detrimental to the growth of S. nipponicus.




Last Update: 2019-05-15