Homeostasis of Setaria viridis (L.) Beauv. in Yantai coastal zone alleviated P limitation
ZHONG Xiao-ying1,2, REN Yi-wei1, YI Hua-peng1, ZHU He2, GAO Meng3
1. College of Resources and Environmental Engineering, Ludong University, Shandong Yantai 264025, China; 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Sichuan Chengdu 610299, China; 3. Yantai University, Shandong Yantai 264005, China
Abstract:In order to explore the nutrient utilization and environmental adaptation strategies of Setaria viridis (L.) Beauv. on different coastal gradients, this paper analyzed the nutrient content of Setaria viridis leaves and soil under the sandy coastal shelter forest in Yantai, and discussed the relationship between leaf stoichiometry characteristics and endostabilizing characteristics and soil. The results showed that there was a certain response in the leaf and soil nutrient content and stoichiometric characteristics of Setaria viridis on different coastal gradients. The soil P content in the study area was extremely low, and more specifically the leaves of Setaria viridis grass P-N:P(leaf nitrogen-phosphorus ratio)>16. The growth and development of Setaria viridis were more limited by the P element. Moreover, P-C (leaf organic carbon), P-P (leaf total phosphorus), P-C:N (leaf carbon-nitrogen ratio), P-C:P (leaf carbon-phosphorus ratio) and P-N:P(the leaf nitrogen-phosphorus ratio) were all in absolute steady state. 1/H(P-N) (the internal stability coefficient of leaf total nitrogen) was 0.26, which belonged to the weak steady state type, but N:P was more stable than N and P elements. It is concluded that Setaria viridis regulate its nutrients in a certain proportion during the growth process. In the study area, Setaria viridis was mainly limited by the P element, but the overall internal stability was high indicating that Setaria viridis was highly adaptable in the coastal environment. It could maintain the dynamic balance of stoichiometry in vivo in a changeable environment, and alleviate the influence of P restriction in coastal areas with a low growing rate.
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