亚热带不同地区苦竹叶片养分化学计量变异特征及其环境的驱动作用  

Characterization of Nutrient Stoichiometry Variability in Pleioblastus amarus Leaves from Different Subtropical Regions and Its Environmental Drivers

作　　者：张景润 左珂怡 郭子武[1] 凡莉莉 林华 胡瑞财 陈双林[1] ZHANG Jing-run;ZUO Ke-yi;GUO Zi-wu;FAN Li-li;LIN Hua;HU Rui-cai;CHEN Shuang-lin(Research Institute of Subtropical Forestry,Chinese Academy of Forestry,Hangzhou 311400,Zhejiang,China;Nanjing Forestry University,Nanjing 210037,Jiangsu,China;Forestry Bureau of Shaxian District,Sanming 365500,Fujian,China;Longyou County Forestry Extension Station,Quzhou 324400,Zhejiang,China)

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江杭州311400 [2]南京林业大学,江苏南京210037 [3]福建省沙县区林业局,福建三明365500 [4]浙江省龙游县林业技术推广站,浙江衢州324400

出　　处：《林业科学研究》2024年第3期146-155,共10页Forest Research

基　　金：“十四五”国家重点研发计划重点专项课题(2021YFD2200501)。

摘　　要：[目的]探究地理分异对苦竹叶片养分化学计量特征的影响及其主要环境驱动因子。[方法]采用Pearson相关分析、LSD差异分析和结构方程建模的方法,分析了不同地区(安徽省潜山县、浙江省龙游县、福建省沙县区)1~3年生苦竹叶片C、N、P含量和化学计量比及其与环境因子的相互关系。[结果]表明:随着纬度的升高,1~3年生苦竹立竹叶片C、N、P含量均呈下降的趋势,而C:N、C:P、N:P总体呈上升的趋势。潜山县立竹叶片C、N、P含量显著低于龙游县和沙县区,而C:N、C:P、N:P龙游县和沙县区明显小于潜山县;随着立竹年龄的增大,立竹叶片C、N、P含量均呈下降的趋势,C:N、C:P呈上升趋势,而N:P不同年龄立竹间无显著变化;Pearson相关分析发现,年平均温度和土壤化学性质(土壤全氮、全磷、全钾、水解性氮、有效磷、速效钾、有机质等)对立竹叶片养分化学计量特征具有重要影响,而年平均降水量等气候因子和土壤物理性质影响不大。结构方程模型结果显示,气候因子、土壤因子与叶片养分化学计量特征均呈显著正相关,并且其总影响效应水平接近。[结论]地理分异导致的苦竹叶片养分化学计量特征变异是气候和土壤因子共同作用的结果。其中,年平均温度和土壤水解性氮、全磷、速效钾含量是影响苦竹叶片养分化学计量变异的主要驱动因子。[Objective]The study aimed to explore the impact of geographical differentiation on the stoi-chiometric characteristics of Pleioblastus amarus leaves and identify their primary environmental drivers.[Method]The C,N,P content,and stoichiometric ratio of P.amarus leaves from three different regions:Qianshan County,Anhui Province;Longyou County,Zhejiang Province;and Shaxian District,Fujian Province were explored.Pearson correlation analysis,LSD difference analysis,and structural equation modeling were employed to investigate the correlation between these characteristics and environmental factors.[Result]The results indicated that the contents of C,N,and P in P.amarus leaves decreased with increasing latitude,while the ratios of C∶N,C∶P,and N∶P showed an overall upward trend.Notably,P.amarus leaves from Qianshan County exhibited significantly lower concentrations of C,N,and P than those from Longyou County and Shaxian District.Moreover,the ratios of C∶N,C∶P,and N∶P were sig-nificantly smaller in Qianshan County than those in the other two regions.Additionally,the study found that as the age of the culms increased,the concentrations of C,N,and P decreased,while the ratios of C∶N and C∶P increased.There was no significant change observed in the N to P ratio with different ages.Pearson correlation analysis revealed that the annual mean temperature and soil chemical properties(such as total nitrogen,total phosphorus,total potassium,hydrolyzed nitrogen,available phosphorus,avail-able potassium,organic matter,etc.)significantly influenced the stoichiometric characteristics of P.am-arus leaves.On the other hand,mean annual precipitation and soil physical properties had little effect on the stoichiometric characteristics of P.amarus leaves.The results of the structural equation model indic-ated a significant positive correlation between climatic factors,soil factors,and leaf stoichiometry charac-teristics,with similar effects.[Conclusion]This suggests that the variation in leaf stoichiometry due to geo-graphi

关 键 词：生态化学计量 地理分异 土壤因子 气候因子 苦竹 

分 类 号：S727.15[农业科学—林木遗传育种]