Effect of Brassinolide on Stoichiometric Stability Characteristics of Tall Fescue under Drought Stress in Ecological Restoration
-
Published:2024-07-12
Issue:14
Volume:16
Page:5942
-
ISSN:2071-1050
-
Container-title:Sustainability
-
language:en
-
Short-container-title:Sustainability
Author:
Kang Roujia1, Li Mingyi2, Guo Shiwei2, Xia Dong3ORCID, Liu Liming2, Dong Wenhao4, Xu Wennian2, Lv Yucai1
Affiliation:
1. College of Biological & Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China 2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, China 3. College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China 4. Hubei Runzhi Ecological Technology Co., Ltd., Yichang 443002, China
Abstract
In order to investigate the effects of brassinolide (BR) on the ecological stoichiometric characteristics and internal stability of plants in slope ecological protection under different drought conditions, the biomass, proline content, nutrient content, and internal stability of tall fescue (Festuca arundinacea) in three stress periods were analyzed by weighing water control method, with three drought degrees (75% ± 5%), mild drought (55% ± 5%) and severe drought (35% ± 5%) and four BR concentrations (0 mg/L, 0.05 mg/L, 0.2 mg/L and 0.5 mg/L). The results showed that drought stress resulted in a decrease in plant biomass and nutrient content, and there were differences in carbon, nitrogen and phosphorus contents and their stoichiometric ratios in different organs. Spraying suitable concentration of BR could alleviate plant nutrient loss and promote nutrient accumulation of the tall fescue. Under normal water spraying conditions 0.2 mg/L, under mild and severe drought conditions with spraying of 0.5 mg/L BR, it is most suitable for the nutrient accumulation in tall fescue. The tall fescue showed high sensitivity to exogenous BR input, and the internal stability of the underground part of the tall fescue increased clearly. BR is propitious to the synthesis of proline and enhances the drought resistance of plants. According to stoichiometric characteristics, BR can improve the nitrogen and phosphorus utilization efficiency of tall fescue to a certain extent, and the results of the nitrogen and phosphorus ratio show that nitrogen is the main factor limiting plant growth in a vegetation concrete ecological restoration system, which can supplement nitrogen to accelerate the process of vegetation restoration. The application of BR can improve the biomass and stress resistance of tall fescue, adjust the nutrient distribution strategy and stoichiometric stability, and alleviate the adverse effects of drought on plants. This study provides new ideas and methods for ecological restoration and vegetation reconstruction in arid areas.
Funder
National Natural Science Foundation of China Yangtze River Scientific Research Institute, Changjiang Water Resources Commission Key Laboratory of Geological Hazards on Three Gorges Reservoir Region, Ministry of Education Hubei Provincial Engineering Research Center for Cement-based Ecological Restoration Technology
Reference58 articles.
1. A state-of-the-art review on the advancement of sustainable vegetation concrete in slope stability;Faiz;Constr. Build. Mater.,2022 2. A review of time-dependent reliability analyses of slopes: Research progress, influencing factors, and future research directions;Xiong;Transp. Geotech.,2022 3. Li, M., Dong, W., Wang, R., Li, Q., Xu, W., Xia, Z., Xiao, H., and Geng, Q. (2022). Ecological stoichiometric changes and the synergistic restoration of vegetation concrete restoration systems under different precipitation conditions. Water, 14. 4. Effect of organic material type and proportion on the physical and mechanical properties of vegetation-concrete;Liu;Adv. Mater. Sci. Eng.,2018 5. Liu, B., Yu, P., Zhang, X., Li, J., Yu, Y., Wan, Y., Wang, Y., Wang, X., Liu, Z., and Pan, L. (2022). Transpiration sensitivity to drought in Quercus wutaishansea mary forests on shady and sunny slopes in the liupan mountains, Northwestern China. Forests, 13.
|
|