植物研究2025，Vol.45Issue(5)：695-706,12.DOI:10.7525/j.issn.1673-5102.2025.05.005
白枪杆幼苗C、N、P化学计量特征与生物量对降雨变化的响应
Response of Stoichiometric Characteristics of C,N and P and Biomass of Fraxinus malacophylla Seedlings to Rainfall Changes
摘要
Abstract
The aim of this study was to explore the effects of variations in rainfall on the growth and C,N,P stoichiometric characteristics of Fraxinus malacophylla seedlings,which could provide a theoretical basis for the application of F.malacophylla seedlings in karst vegetation restoration.In this study,two-year-old F.malacophylla seedlings were used as materials,and the treatments with 40%increased rainfall,40%reduced rainfall,natural rainfall,and 5-and 10-day rainfall intervals were set,and the responses of seedling biomass and C,N,P stoichiometric characteristics were investigated,respectively.The results showed that both extending the rainfall interval and reducing rainfall significantly inhibited biomass accumulation of seedlings,roots,stems,and leaves,whereas increasing rainfall had an opposite effect.Leaf C and P contents significantly increased(P<0.05),whereas leaf N content significantly decreased under the increased rainfall(P<0.05).Under the reduced rainfall,the contents of C,N,and P in roots,C and P in stems,C and N in leaves significantly decreased at a five-day rainfall interval(P<0.05).The contents of C,N,and P in roots,stems,and leaves significantly decreased at a 10-day rainfall interval(P<0.05).Under the conditions of reduced and natural rainfalls,the leaf N∶P ratio was greater than 16,indicating that the growth of seedlings was limited by P.Under the increased rainfall,the leaf N∶P ratio ranged from 14 to 16,indicating that the growth of seedlings was limited by both N and P.The above results revealed that F.malacophylla seedlings responded to rainfall changes by regulating the biomass accumulation and C,N,P stoichiometric characteristics in organs.The findings could provide a scientific basis for restoration of vegetation in Karst regions and for the cultivation and management of F.malacophylla.关键词
降雨量/降雨时间间隔/生态化学计量/生物量/白枪杆Key words
rainfall/rainfall interval/ecological stoichiometry/biomass/Fraxinus malacophylla分类
农业科技引用本文复制引用
赵启泽,茶晓飞,郑绍傑,王元友,韦兴兰,董琼..白枪杆幼苗C、N、P化学计量特征与生物量对降雨变化的响应[J].植物研究,2025,45(5):695-706,12.基金项目
西南林业大学基金项目(110823045 （）
2022Y581). （）
