Characterization of Nutrient Stoichiometry Variability in Pleioblastus amarus Leaves from Different Subtropical Regions and Its Environmental Drivers
[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-graphical differentiation may be attributed to the combined effect of climate and soil factors.Among these factors,the annual average temperature,soil hydrolyzable nitrogen,soil total phosphorus,and soil avail-able potassium are the main indicators affecting the stoichiometric variation of leaves.
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