摘要
采用Pregitzer的方法对细根进行分级,测定川西亚高山红桦、岷江冷杉和粗枝云杉3种优势树种1~5级细根（直径〈2 mm）碳（C）、氮（N）和磷（P）浓度,并计算它们之间的化学计量比.结果表明：3种优势树种的细根的C浓度、C/N和C/P随根序的升高而升高,N和P浓度随根序的升高而降低,而N/P在不同根序间变化不显著.细根C、N和P浓度及其化学计量比在3个物种之间差异显著,且这种差异随细根根序的不同而变化.3种树种的细根C、N、P浓度及其化学计量比之间存在显著相关关系.
Fine root order was classified according to Pregitzer＇s method. This study measured car- bon （C）, nitrogen （N） and phosphorus （P） concentrations of the 1-5 root orders （diameter〈2 mm） in three dominant subalpine tree species （Betula albosinensis, Abiesfaxoniana and Picea aspe- rata） of western Sichuan. Their stoichiometric ratios of different root orders were also calculated. The results showed that C concentration, C/N and C/P increased, hut N and P concentrations de- creased from the first to fifth order of fine root for all tree species. No significant changes in N/P among root orders were detected in each species. There were significant differences in C, N, P con- centrations and their stoichiometric ratios among the tree species. The species-associated differences were dependent on root order. There were significant correlations between C, N, P concentrations and their stoichiometric ratios in the three tree species.
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第2期363-369,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(31170423
31200474
31270498)
"十二五"国家科技支撑计划项目(2011BAC09B05)
四川省杰出青年学术与技术带头人培育项目(2012JQ0008
012JQ0059)
中国博士后科学基金项目(2013M540714
2012T50782
2014T70880)
四川省教育厅重点项目(12ZA105)资助
关键词
化学计量比
根序
粗枝云杉
岷江冷杉
红桦
stoichiometric ratio
root order
Picea asperata
Abies faxoniana
Betula albosinensis.
作者简介
唐仕姗，女，1990年生，硕士研究生．主要从事森林生态研究．E—mail：1137352361@qq．com
通讯作者．E-mail：sicauxzf@163．com
