川西亚高山3个优势树种不同径级根系分解特征

应用生态学报

川西亚高山3个优势树种不同径级根系分解特征

唐仕姗¹,杨万勤¹,王海鹏²,熊莉¹,聂富育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:2015-10-18 发布日期:2015-10-18

Decomposition and nutrient release of root with different diameters of three subalpine dominant trees in western area of Sichuan Province, China.

TANG Shi-shan¹, YANG Wan-qin¹, WANG Hai-peng², XIONG Li¹, NIE Fu-yu¹, XU Zhen-feng¹

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

Online:2015-10-18 Published:2015-10-18

摘要/Abstract

摘要：

采用埋袋法对川西亚高山3个优势树种(岷江冷杉、粗枝云杉和红桦)细根(≤2 mm)、中根(2～5 mm)和粗根(≥5 mm)质量损失率及碳(C)、氮(N)、磷(P)在经历生长季和非生长季之后释放特征进行研究.结果表明：红桦质量残留率低于岷江冷杉和粗枝云杉.同一树种，质量残留率总体上随根系径级增加而增加.非生长季的质量损失率占全年质量损失率的52.1%～64.4%.红桦C释放率最高，岷江冷杉最低，且随根系直径的增粗，C释放率降低.岷江冷杉和粗枝云杉N释放模式为非生长季富集、生长季释放，而红桦反之.富集期间，径级越大，富集量越多.3个树种各径级根系P动态在非生长季和生长季皆表现为富集-释放模式，且岷江冷杉P富集程度显著高于粗枝云杉和红桦，但各径级之间差异总体不显著.根系径级对川西亚高山森林根系分解具有显著影响，而径级影响与树种和分解时期有一定关系.

Abstract: In this study, a buried bag experiment was used to investigate mass loss and C, N and P release patterns of fine (≤2 mm), medium (2-5 mm) and coarse (≥5 mm) roots of 3 subalpine dominant trees, i.e., Betula albosinensis, Abies faxoniana and Picea asperata in the growing and nongrowing seasons. In general, the remaining mass of B. albosinensis was lower than that of A. faxoniana and P. asperata. In addition, root remaining mass increased with the increase of root dia
meter for the same species. The mass losing rate in the nongrowing season was 52.1%-64.4% of a year. The C release of B. albosinensis was the highest, but that of A. faxoniana was the lowest. Also, C release decreased with the increase of root diameter. N of A. faxoniana and P. asperata were enriched in the nongrowing season but released in the growing season. However, the opposite pattern was found for B. albosinensis. During the nongrowing season, the amount of N enrichment increased with the increase of root diameter. The P release of 3 species was characterized as the enrichmentrelease pattern. P enrichment of A. faxoniana was significantly greater than that of P. asperata and B. albosinensis. Nevertheless, no significant difference was observed between diameter sizes. In conclusion, diameter size had significant effect on root decomposition in the subalpine forests of western Sichuan, and the diameter effect was dependent on tree species and season.

唐仕姗1,杨万勤1,王海鹏2,熊莉1,聂富育1,徐振锋1**. 川西亚高山3个优势树种不同径级根系分解特征[J]. 应用生态学报.

TANG Shi-shan1, YANG Wan-qin1, WANG Hai-peng2, XIONG Li1, NIE Fu-yu1, XU Zhen-feng1. Decomposition and nutrient release of root with different diameters of three subalpine dominant trees in western area of Sichuan Province, China.[J]. Chinese Journal of Applied Ecology.