川西亚高山针叶林云杉和冷杉生长季和非生长季叶片碳氮磷化学计量特征  

Leaf C:N:P stoichiometry in a growing season and nongrowing season of Picea asperata and Abies faxoniana, dominant tree species in subalpine coniferous forests of western Sichuan

作　　者：杨欢[1,2] 尹春英 郑东辉 唐波[1,2] 赵文强 李娜[1] 濮晓珍 刘庆 

机构地区：[1]中国科学院山地生态恢复与生物资源利用重点实验室,生态恢复与生物多样性保育四川省重点实验室,中国科学院成都生物研究所,成都610041 [2]中国科学院大学,北京100049 [3]石河子大学生命科学学院,石河子832000

出　　处：《应用与环境生物学报》2017年第6期1089-1095,共7页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(31370495,31070533,31570477和31400424);中国科学院“西部之光”项目(Y4C2021)资助~~

摘　　要：以川西亚高山针叶林主要优势树种粗枝云杉(Picea asperata)和岷江冷杉(Abies faxoniana)为研究对象,通过比较叶片碳(C)、氮(N)、磷(P)浓度及其化学计量比在生长季(8月)和非生长季(1月)的特征,分析其变化规律并对碳氮磷进行相关性分析.结果显示,云杉和冷杉叶片C、N、P浓度及其计量比均受到采样季节的显著影响,云杉和冷杉叶片C浓度均表现为生长季显著高于非生长季,生长季云杉N浓度显著低于非生长季,生长季云杉和冷杉P浓度均显著低于非生长季.C:N、C:P以及N:P均表现为生长季显著高于非生长季.生长季云杉和冷杉叶C:N:P质量比分别为407:13:1、447:14:1,非生长季C:N:P质量比分别为274:11:1、235:9:1.仅C浓度存在显著的树种间差异,表现为非生长季云杉叶片C浓度显著低于冷杉.两树种叶C、N、P浓度相关性分析结果表明云杉和冷杉叶片C浓度与N浓度、P浓度呈显著负相关,N浓度和P浓度呈显著正相关.本研究表明云杉和冷杉叶中C、N、P化学计量特征主要受生长季节影响,但若要全面了解川西亚高山针叶林C、N、P化学计量特征,还需长期研究并与林下土壤C、N、P化学计量比结合起来讨论分析.To explore the difference in leaf C：N：P stoichiometry of coniferous trees between a growing season （August） and nongrowing season （January）, we used the seedlings of Picea asperata and Abies faxoniana—widely distributed and important species in subalpine coniferous forests of Sichuan, China, as materials to conduct the experiment and analyze the correlations between leaf C, N, and P concentrations and their stoichiometric ratios in the two tree species. The results showed that leaf C, N, and P concentrations and their stoichiometric ratios in the two tree species were affected significantly by a sampling date （season）： leaf C concentrations of P. asperata and A. faxoniana were significantly higher in the growing season than in the nongrowing season. Leaf N concentration of P. asperata was significantly lower in the growing season than in the nongrowing season. Leaf P concentrations of the two tree species were significantly lower in the growing season than in the nongrowing season. Leaf C：N, C：P, and N：P ratios of P. asperata and A. faxoniana were significantly higher in the growing season than in the nongrowing season. In the growing season, the mass ratios of C：N：P of P. asperata and A. faxoniana were 407：13：1 and 447：14：1, respectively. In the nongrowing season, the mass ratios of C：N：P of P. asperata and A. faxoniana were 274：11：1 and 235：9：1, respectively. Nonetheless, only leaf C concentration was affected by plant species： leaf C concentration of P. asperata in the nongrowing season was higher than that of A. faxoniana. Moreover, the results of correlation analysis showed that leaf C concentration was significantly negatively related to leaf N concentration and P concentration. Leaf N concentration had a significant positive relation to leaf P concentration. The results suggest that the leaf C：N：P stoichiometry in P. asperata and A. faxoniana were mainly determind by sampling date （season）. It’s necessary to consider sampling time and undergroun

关 键 词：生态化学计量比 针叶林 生长季 非生长季 叶片 

分 类 号：S791.14[农业科学—林木遗传育种] S791.18[农业科学—林学]