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2 贡嘎山树线过渡带不同位置土壤基本理化性质(平均值±标准误)

Table 2 Soil physic-chemical properties at different locations in the treeline ecotone in Gongga Mountain (mean ± SE)

土壤指标 Soil index	森林 Forest			树线 Treeline	灌丛 Shrub			位置 Location
土壤指标 Soil index	F3	F2	F1	树线 Treeline	S1	S2	S3	位置 Location
有机碳含量 SOC content (mg·g^-1)	218.8 ± 34.0^a	185.8 ± 23.7^ab	171.1 ± 24.6^ab	173.9 ± 16.2^ab	139.9 ± 27.1^b	160.3 ± 7.0^ab	118.3 ± 12.3^b	*
全氮含量 TN content (mg·g^-1)	11.0 ± 1.9^a	8.7 ± 1.2^ab	9.1 ± 1.4^ab	8.5 ± 0.7^ab	7.4 ± 1.3^ab	7.9 ± 0.5^ab	6.0 ± 0.8^b	*
碳氮比 C:N	20.2 ± 0.6^a	21.5 ± 1.5^a	18.9 ± 0.8^a	20.5 ± 0.5^a	19.0 ± 0.7^a	20.4 ± 0.7^a	19.9 ± 0.7^a	NS
可溶性有机碳含量 DOC content (μg·g^-1)	317.7 ± 53.3^a	3 109.8 ± 84.1^a	241.3 ± 29.8^ab	265.2 ± 42.5^ab	199.9 ± 56.6^ab	227.9 ± 18.8^ab	142.3 ± 23.4^b	**
可溶性氮含量 DN content (μg·g^-1)	30.5 ± 2.3^a	34.1 ± 13.1^a	21.9 ± 3.7^ab	22.2 ± 4.1^ab	16.8 ± 3.0^ab	28.7 ± 7.7^a	11.6 ± 0.7^b	**
可溶性碳氮比 DOC:DN	10.4 ± 1.6^a	10.2 ± 0.8^a	11.3 ± 0.6^a	12.8 ± 2.0^a	11.4 ± 1.7^a	10.1 ± 2.4^a	12.2 ± 1.9^a	NS
铵态氮含量 NH₄⁺-N content (μg·g^-1)	41.2 ± 11.4^a	40.5 ± 9.2^a	36.2 ± 6.9^a	36.8 ± 3.4^a	42.3 ± 15.0^a	48.1 ± 15.0^a	26.5 ± 6.3^a	NS
硝态氮含量 NO₃^--N content (μg·g^-1)	5.8 ± 0.5^a	5.6 ± 0.5^a	5.0 ± 0.4^ab	5.0 ± 0.5^ab	4.3 ± 0.5^b	4.5 ± 0.4^ab	3.8 ± 0.4^b	***
pH	4.0 ± 0.1^b	3.9 ± 0.1^b	4.3 ± 0.1^a	4.1 ± 0.1^ab	4.2 ± 0.1^ab	4.1 ± 0.1^ab	4.1 ± 0.1^ab	*
黏粒含量 Clay content (%)	5.1 ± 0.8^a	4.9 ± 0.5^a	4.7 ± 0.9^a	3.9 ± 0.6^a	4.8 ± 0.8^a	4.3 ± 0.4^a	5.1 ± 0.6^a	NS
砂粒含量 Sand content (%)	27.6 ± 6.2^a	28.1 ± 3.5^a	33.8 ± 7.6^a	37.3 ± 5.5^a	38.9 ± 3.8^a	33.8 ± 2.2^a	29.0 ± 4.1^a	NS
微生物生物量碳含量 MBC content (μg·g^-1)	2 905 ± 611^a	2 672 ± 203^a	2 141 ± 386^a	2 696 ± 323^a	2 242 ± 605^a	2 717 ± 142^a	1 859 ± 239^a	NS