Abstract
In recent years, seeking solutions to urban waterlogging and water pollution has always been one of the topics of concern. The problem of urban water accumulation occurs frequently in most areas of China in July and August. The contradiction between supply and demand of urban ecological water is prominent. In order to solve the problem of urban water accumulation caused by rainfall concentration, and to achieve the overall goal of building a water-saving green ecological city, the Shenzhen City should be built into a sponge city. Under this background, the physiological response of different forages to waterlogging stress and the removal of pollutants in rainwater were studied. In this study, ten herbaceous plants commonly used in Shenzhen were used as experimental materials. After 0, 7, 14, 21, 28 days of waterlogging stress treatment, six physiological indexes, such as MDA, SP, and Pro contents and SOD, POD, and CAT activities, were comprehensively evaluated. Combined with the morphological changes of the plants after waterlogging, seven plants with strong waterlogging tolerance were determined, which were O. bodinieri, H. coronarium, I. tectorum, D. ensifolia, R. brittoniana, C. indica, and A. zerumbet. Then, according to their comprehensive evaluation of the removal capacity of pollutants in the rainwater, it is suggested to select O. bodinieri, H. coronarium, I. tectorum and D. ensifolia in areas with serious waterlogging. In areas with serious water pollution, R. brittoniana, A. zerumbet, D. ensifolia and H. coronarium are recommended. However, H. coronarium and D. ensifolia not only have a strong adaptability in the waterlogged environment, but also have a strong ability to remove pollutants in the rainwater, so they are suggested to be alternative herbaceous plants for sponge city in Shenzhen, China.
Highlights
Due to the lack of foresight in the early stage of development, many cities in China are facing many challenges of environmental problems, especially the problems of urban waterlogging and water pollution
Results showed that I. tectorum and C. indica maintained a high level of Pro content of the leaves under waterlogging stress, which may be conducive to the balance of intracellular and extracellular osmotic potential, but the performances of N. auriculata were weaker than those of other plants
Ten herbaceous plants (N. auriculata, O. bodinieri, S. podophyllum, I. tectorum, R. brittoniana, A. elatior, H. coronarium, A. zerumbet, C. indica, and D. ensifolia) were selected as experimental materials to compare the effects of different durations of waterlogging stresses (0, 7, 14, 21, and 28 days) on the six physiological indices of MDA, soluble protein (SP), and Pro contents and superoxide dismutase (SOD), POD, and CAT activities
Summary
Due to the lack of foresight in the early stage of development, many cities in China are facing many challenges of environmental problems, especially the problems of urban waterlogging and water pollution. Given the frequent rainstorms in July and August in most areas of China, the contradiction between the supply and demand of urban ecological water is prominent. China has proposed the concept of sponge. Received in revised form: 18 Jun 2020.
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