生态学杂志2024，Vol.43Issue(5)：1255-1262,8.DOI:10.13292/j.1000-4890.202405.047
氮添加对不同氮需求豆科植物幼苗根系形态性状和根叶养分含量的影响
Effects of nitrogen addition on root morphology and nutrient content of roots and leaves of leguminous seedlings with different nitrogen requirements
摘要
Abstract
We examined the effects of nitrogen addition on the seedlings of three leguminous species with different nitrogen requirements in tropical rainforest of Hainan,including Ormosia balancae with low nitrogen requirement,Ormosia semicastrata f.litchifolia with medium nitrogen requirement,and Archidendron clypearia with high nitrogen requirement.A pot experiment with five nitrogen addition levels(0,75,150,300 and 600 mg·kg-1)was con-ducted.Responses of root morphological traits and nutrient content of root and leaf were investigated.The results showed that:(1)Increasing nitrogen addition levels significantly reduced total root length,total root surface area,and root dry weight of the leguminous species with low nitrogen demand(O.balansae)and medium nitrogen de-mand(O.semicastrata f.litchifolia),but did not affect that of leguminous species with high nitrogen demand(A.clypearia).(2)The correlation analysis showed that total root length,total root surface area,and root dry weight of O.balansae and O.semicastrata were significantly negatively correlated with nitrate and ammonium concentrations in rhizosphere soil.(3)Nitrogen addition had positive effects on the nutrient content of roots and leaves of legumi-nous species with low and medium nitrogen demands,but did not affect that of high nitrogen demand species.Spe-cifically,nitrogen addition significantly increased the total nitrogen content of leaves and roots of leguminous species with low nitrogen demand(O.balancae),while nitrogen and phosphorus content in the leaves and roots of legumes with medium nitrogen demand(O.semicastrata f.litchifolia)were promoted.In summary,the effects of nitrogen addition on leguminous plants depended on plant nitrogen demands and nitrogen addition levels.Nitrogen addition significantly inhibited root growth of legumes with low and medium nitrogen demands,and enhanced N and P con-tents of roots and leaves.In contrast,nitrogen addition had no effects on root morphological traits of legumes with high nitrogen demand,and only promoted root N content.It is necessary to fully consider the characteristics of legu-minous plants when examining the effects of nitrogen deposition on stoichiometric characteristics of legume species and community dynamics.关键词
热带雨林/豆科植物/土壤无机氮/根系形态性状/养分状态Key words
tropical rainforest/legume/soil inorganic nitrogen/root morphology trait/nutrient status引用本文复制引用
董佳乐,许涵,解亚鑫,陈洁,李艳朋,雷婕..氮添加对不同氮需求豆科植物幼苗根系形态性状和根叶养分含量的影响[J].生态学杂志,2024,43(5):1255-1262,8.基金项目
中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2022SY014,CAFYBB2021ZH002,CAFYBB2021SY002)和科技部国家科技基础资源调查《海南尖峰岭、广东南岭资源环境和生物多样性调查》课题(2019FY101607)资助. （CAFYBB2022SY014,CAFYBB2021ZH002,CAFYBB2021SY002）
