川西亚高山三种优势树种不同根序碳氮磷化学计量特征

应用生态学报

川西亚高山三种优势树种不同根序碳氮磷化学计量特征

唐仕姗¹,杨万勤¹,熊莉¹,殷睿¹,王海鹏²,张艳¹,徐振锋^1**

(¹四川农业大学生态林业研究所四川林业生态工程重点实验室, 成都 611130; ²四川农业大学水稻研究所, 成都 611130)

出版日期:2015-02-18 发布日期:2015-02-18

C, N and P stoichiometric characteristics of different root orders for three dominant tree species in subalpine forests of western Sichuan, China.

TANG Shi-shan¹, YANG Wan-qin¹, XIONG Li¹, YIN Rui¹, WANG Hai-peng², ZHANG Yan¹, XU Zhen-feng¹

(¹Sichuan Key Laboratory of Ecological Forestry Engineering, Institute of Ecology & Forestry, Sichuan Agricultural University, Chengdu 611130, China; ^2Rice Institute, Sichuan Agricultural University, Chengdu 611130, China)

Online:2015-02-18 Published:2015-02-18

摘要/Abstract

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.

Abstract: Fine root order was classified according to Pregitzer’s method. This study measured carbon (C), nitrogen (N) and phosphorus (P) concentrations of the 1-5 root orders (diameter<2 mm) in three dominant subalpine tree species (Betula albosinensis, Abies faxoniana and Picea asperata) 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, but N and P concentrations decreased 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 concentrations 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.

唐仕姗1,杨万勤1,熊莉1,殷睿1,王海鹏2,张艳1,徐振锋1**. 川西亚高山三种优势树种不同根序碳氮磷化学计量特征[J]. 应用生态学报.

TANG Shi-shan1, YANG Wan-qin1, XIONG Li1, YIN Rui1, WANG Hai-peng2, ZHANG Yan1, XU Zhen-feng1. C, N and P stoichiometric characteristics of different root orders for three dominant tree species in subalpine forests of western Sichuan, China.[J]. Chinese Journal of Applied Ecology.