摘要
大气氮沉降是全球变化的重要问题之一,可能会造成植物化学计量失衡并对植物的代谢产生负面影响。毛竹是我国栽培历史悠久、分布广泛且具有重要经济价值的竹种。本研究在福建省戴云山国家级自然保护区内的毛竹林设置3个氮添加水平(对照CT、低氮LN和高氮HN)以模拟氮沉降。通过测定土壤基本理化性质,毛竹叶片与细根的碳(C)、氮(N)、磷(P)含量,细根生物量和叶片代谢组分含量,探究氮添加对毛竹化学计量学和代谢组分的影响。结果表明:氮添加对毛竹叶片P含量、C∶P和N∶P具有显著的正效应,但对毛竹细根P含量、C∶P、N∶P和生物量无显著影响。这表明毛竹不同器官磷利用效率对氮添加的响应存在差异。高氮添加显著提高叶片丙二醛含量,且显著降低超氧化物歧化酶活性,但低氮添加对毛竹叶片的代谢组分均无显著性影响。这表明低氮添加下毛竹总体上能够维持相对稳定的代谢活性。本研究结果揭示了氮沉降下毛竹不同器官的养分利用特征,发现毛竹叶片在低氮添加下具有较强的适应性。
Atmospheric nitrogen deposition is one of the important issues of global changes,which may cause stoi⁃chiometric imbalances in plants and negatively affect plant metabolism.Phyllostachys edulis is a bamboo species with long cultivation history,wide distribution,and important economic value in China.In this study,we conducted a field experiment with three nitrogen addition levels[control(CT),low nitrogen(LN),and high nitrogen addi⁃tions(HN)]to simulate nitrogen deposition in a Ph.edulis forest in Daiyunshan National Nature Reserve,Fujian Province,China.The effects of nitrogen addition on the stoichiometry and metabolic components of Ph.edulis were investigated by determining basic physical and chemical properties of soils,carbon,nitrogen,and phosphorus con⁃tents of Ph.edulis leaves and roots,the biomass of fine roots,and the metabolic component contents of leaves.The results showed that nitrogen addition significantly increased phosphorus content,carbon∶phosphorus(C∶P)ratio and nitrogen∶phosphorus(N∶P)ratio of leaves,but did not affect those variables and biomass in fine roots.Those results indicated that phosphorus use efficiency of Ph.edulis differed across organs in response to nitrogen ad⁃dition.High nitrogen addition significantly increased leaf malondialdehyde content and decreased superoxide dis⁃mutase activity,whereas low nitrogen addition had no significant effect on the metabolic components in leaves.This result suggested that Ph.edulis can maintain relatively stable metabolic activity under low nitrogen addition.In sum⁃mary,this study clarified nutrient use characteristics of different organs of Ph.edulis under nitrogen deposition,and identified the stronger adaptive strategy of leaves under low nitrogen addition.
作者
卢姣宏
张秋芳
曾泉鑫
彭园珍
徐敏
陈琳娜
陈文伟
陈岳民
LU Jiaohong;ZHANG Qiufang;ZENG Quanxin;PENG Yuanzhen;XU Min;CHEN Linna;CHEN Wenwei;CHEN Yuemin(Institute of Geography,Fujian Normal University,Fuzhou 350117,China;State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Tech-nology and Fujian Province,Fujian Normal University,Fuzhou 350117,China;Fujian Provincial Key Laboratory for Subtropical Resources and Environment,Fujian Normal University,Fuzhou 350117,China;Daiyun Mountain National Nature Reserve Administration Bureau,Quanzhou 362500,Fujian,China)
出处
《生态学杂志》
北大核心
2025年第8期2567-2574,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(32371846,32471684)
福建省自然科学基金项目(2023R1002002,2024J01466)
福建师范大学大学生创新训练计划项目(cxxl⁃2024016)资助。
关键词
氮添加
毛竹
化学计量学
渗透物质
抗氧化酶
nitrogen addition
Phyllostachys edulis
stoichiometry
osmotic substance
antioxidant enzyme
