雅鲁藏布大峡谷植物叶片碳氮磷化学计量特征  

Stoichiometric Characteristics of Leaf C,N and P in Yarlungzangbu Grand Canyon

作　　者：赵佳敏 关丽雪 王伟 郑维列[1,2] ZHAO Jiamin;GUAN Lixue;WANG Wei;ZHENG Weilie(Research Institute of Tibet Plateau Ecology,Tibet Agriculture&Animal Husbandry University,Tibet Agriculture&Animal Husbandry University;Resources&Environment College,Tibet Agriculture&Animal Husbandry University,Nyingchi Tibet,860000,China)

机构地区：[1]西藏农牧学院高原生态研究所 [2]西藏农牧学院资源与环境学院,西藏林芝860000

出　　处：《高原农业》2024年第1期65-79,共15页Journal of Plateau Agriculture

基　　金：西藏农牧学院资源与环境学院农业资源与环境学科建设开发课题;西藏农牧学院研究生创新项目(YJS2021-25);厅校联合基金一般项目(XZ202101ZR0023G);国家自然科学基金(42067036)。

摘　　要：为了解雅鲁藏布大峡谷区域植物的生态适应性及N、P养分利用特征,该研究在墨脱不同森林植被区选取6个采样点,对每个采样点优势植物进行了植物叶片C、N、P化学计量特征分析。结果表明,研究区植物叶片碳含量均值为452 g kg^(-1),在不同采样点之间差异未达到显著水平,其余指标在部分采样点之间则存在一定的差异;从生活型看,研究区木本植物叶片碳含量要高于草本植物,氮含量差异不显著,磷含量则低于草本植物;在不同采样点之间木本植物叶片碳氮磷含量差异不显著,木本植物碳氮差异也不显著,但草本植物部分采样点之间磷差异达到显著水平;相关性分析显示,植物叶片C与N、C与P相关性均不显著,但N、P相关性达到极显著水平;墨脱常绿阔叶林区植物叶片C含量略低于我国南方其它常绿阔叶林区植物叶片碳含量,氮含量略高于其他区域,但P含量显著高于其他区域的植物叶片P含量,因此C/N,C/P及N/P均较低,N/P的均值为11.4。本研究结果支持植物叶片氮磷在不同生境中均存在明显正相关关系,结合生长速率假说,墨脱常绿阔叶林区的植物生长速率可能远高于我国其他常绿阔叶林区,因此研究区森林生态系统的碳汇以及面对全球N沉降背景下的响应值得进一步研究。This study investigates the ecological adaptability and nutrient utilization characteristics of plants in the subtropical evergreen broad-leaved forest of the Yarlung Zangbo Grand Canyon,Tibet,China.Six sampling sites representing different forest vegetation types in Medog County were selected,and the leaf chemical stoichiometry(C,N,and P)of dominant plant species at each site was analyzed.The results showed that the average leaf carbon concentrations were comparable,with an averaged value of 452 g kg^(-1).However,there were differences in other stoichiometric parameters among some of the sampling sites.Leaf C concentrations of woody plants was higher than those in herbaceous plants,while N concentrations was not significantly different,and phosphorus concentrations was lower than that of herbaceous plants.At different sampling sites,there were no significant differences in leaf C,N and P concentrations in woody plants,but leaf P concentrations were reached a significant level among some sampling points.Correlation analysis revealed no significant relationship between leaf C and N or P,but a significant positive correlation existed between leaf N and P concentrations.Leaf C concentrations in our research area was slightly lower than those in other evergreen broad-leaved forest areas in southern China,while nitrogen concentrations were slightly higher,but P concentrations were significantly higher than in other regions.Consequently,the C/N,C/P,and N/P ratios were relatively low,with an average N/P ratio of 11.4.These findings supported the positive correlation between leaf N and P concentrations in different environments.Considering the growth rate hypothesis,the plant growth rate in our research areas might be higher than in other evergreen broad-leaved forest in China.Thus,further research is needed to explore the carbon sequestration potential of forest ecosystems in this area,especially concerning the increased global N deposition flux.

关 键 词：雅鲁藏布大峡谷 常绿阔叶林 植物叶片 化学计量特征 生活型 

分 类 号：Q948.1[生物学—植物学]