In this study, based on the simulated discharge results of chemical disinfectants, hypocotyl germination concentration gradient pre-test and concentration gradient determination experiment were set up respectively. Laboratory cultivation was conducted to compare and analyze the root germination and germination indexes, three mangrove hypocotyls of Kandelia candel (Linn.) Druce, Ceriopstagal C.B. Rob. and Bruguiera sexangula var. Rhynchopetalas’ efficiency of cumulative root germination, cumulative germination and the cumulative expansion of the second pair of leaves, one-way analysis of variance was used to obtain the tolerance threshold of three mangrove hypocotyls to strong chlorin disinfectant. The study determined that the by-products of strong chlorin disinfectant, the toxic threshold concentrations of Kandelia candel (Linn.) Druce, Ceriopstagal C.B. Rob. and Bruguiera sexangula var. rhynchopetala are close to 0.55 mg/L, 0.55 mg/L and 0.25 mg/L, respectively. This concentration range is lower than the average concentration of 1.183 mg/L of active chlorine emitted from strong chlorine concentrate during pond clearing in high-level shrimp ponds, indicating that transient emissions of strong chlorine concentrate during pond clearing can have a toxic effect on mangrove plants. The strength of tolerance of the embryonic axes of the three mangrove species to effective chlorine contamination was, Ceriopstagal C.B. Rob. stronger than Bruguiera sexangula var. rhynchopetala, and Kandelia candel (Linn.) Druce is the weakest.
References
[1]
Lin, P. (1997) Mangrove Ecosystems of China. Science Press, Beijing, 14-59.
[2]
Macnae, W. (1968) A General Account of the Fauna and Flora of Mangrove Swamps and Forests in the Indo-West-Pacific Region. Advances in Marine Biology, 6, 73-103. https://doi.org/10.1016/S0065-2881(08)60438-1
[3]
Kathiresan, K. and Bingham, B.L. (2001) Biology of Mangroves and Mangrove Ecosystems. Advances in Marine Biology, 40, 81-251. https://doi.org/10.1016/S0065-2881(01)40003-4
[4]
Li, Y., Bai, Y. and Miao, Z.Y. (2012) Effects of Different Chemical Treatments on Seed Germination of Chinese Cabbage. Northern Horticulture, No. 22, 142-144.
[5]
Huo, M., Chen, Y.H. and Chen, T. (2008) Effects of Sludge Hydrolysis Residues on Plant Growth. Journal of Hubei University (Natural Science Edition), 30, 208-211.
[6]
Yu, M.Y., Huang, Y.W., Feng, G.H. and Liu, Q.F. (2007) A Preliminary Report on the Effect of Strong Chlorine Concentrate on the Germination Rate of Hybrid Rice Seeds. Guangdong Agricultural Science, No. 7, 32-33.
[7]
Xu, W.D., Li, G. and Lu, Q. (2018) Research on the Method of Rapid De-Dormancy of Early Indica Rice Seeds by Efficient Treatment with Strong Chlorin. Seed, 37, 94-96.
[8]
Mok, Z.C., Fan, H.Q. and He, B.Y. (2001) Effects of Seawater Salinity on Embryonic Axis Germination of Two Mangrove Plants. Journal of Plant Ecology, No. 2, 235-239.
[9]
Zhang, Y.H. (2003) Physiological Ecology of Propagule Development and Seedling Growth in Several Species of Mangrove Plants. Xiamen University, Xiamen.
[10]
He, Q.F., Peng, Y.H. and Liu, X. (2014) Habitat Adaptability Test of Seedling Embryonic Axes of Eggplant. Forestry Science and Technology Development, 28, 108-110.
[11]
Chen, Y., Cheng, X.L. and Lin, K.Y. (2012) Germination Characteristics of the Embryonic Axes of Mangrove Plants. Journal of Zhanjiang Normal College, 33, 105-109.
[12]
Lu, Z.Q., Zheng, W.J., Ma, L. and Chen, W.T. (2005) Effects of Different Concentrations of Naphthalene and Pyrene on the Germination of Embryonic Axes and Seedling Growth of the Mangrove Plant Erythrina aurantium. Journal of Xiamen University (Natural Science Edition), No. 4, 580-583.
