贡嘎山树线过渡带土壤胞外酶活性及其化学计量比特征

李东, 田秋香, 赵小祥, 林巧玲, 岳朋芸, 姜庆虎, 刘峰

Soil extracellular enzyme activities and their stoichiometric ratio in the alpine treeline ecotones in Gongga Mountain, China

LI Dong, TIAN Qiu-Xiang, ZHAO Xiao-Xiang, LIN Qiao-Ling, YUE Peng-Yun, JIANG Qing-Hu, LIU Feng

表1 贡嘎山树线过渡带不同位置优势树种植被属性及叶片养分特征(平均值±标准误)

Table 1 Vegetation properties and leaf nutrient characteristics of dominant tree species at different locations in the treeline ecotone in Gongga Mountain (mean ± SE)

	森林(峨眉冷杉) Forest (Abies fabri)					树线(峨眉冷杉) Treeline (Abies fabri)	灌丛(毡毛栎叶杜鹃) Shrub (Rhododendron phaeochrysum var. levistratum)			位置 Location
	F3	F2		F1		树线(峨眉冷杉) Treeline (Abies fabri)	S1	S2	S3	位置 Location
单位面积胸高断面积 BA (m²·hm^-2)	291.0 ± 49.0^a		235.7 ± 42.2^ab		171.1 ± 47.9^abc	110.1 ± 22.9^c	135.6 ± 17.3^bc	149.9 ± 14.7^bc	124.8 ± 19.2^bc	**
叶片碳含量 Leaf carbon (C) content (mg·g^-1)	429.4 ± 35.5^ab		457.9 ± 41.1^a		431.0 ± 28.8^a	397.2 ± 25.0^abc	361.8 ± 34.3^bc	369.0 ± 26.1^bc	354.8 ± 20.2^c	***
叶片氮含量 Leaf nitrogen (N) content (mg·g^-1)	13.2 ± 0.3^a		12.7 ± 0.8^a		13.1 ± 0.8^a	12.2 ± 0.5^a	8.6 ± 0.8^b	8.3 ± 0.5^b	7.9 ± 0.7^b	***
叶片碳氮比 Leaf C:N	32.5 ± 2.2^c		36.0 ± 1.4^bc		33.2 ± 2.2^bc	32.7 ± 2.4^bc	42.3 ± 2.6^ab	44.8 ± 3.4^a	45.8 ± 3.3^a	***
叶片木质素:氮 Leaf lignin:N	1.7 ± 0.1^b		1.9 ± 0.1^ab		2.0 ± 0.1^ab	2.1 ± 0.1^a	0.8 ± 0.1^c	0.7 ± 0.0^c	0.7 ± 0.1^c	***