川西亚高山不同演替阶段天然次生林土壤碳氮含量及酶活性特征

胡宗达, 刘世荣, 罗明霞, 胡璟, 刘兴良, 李亚非, 余昊, 欧定华

Characteristics of soil carbon and nitrogen contents and enzyme activities in sub-alpine secondary forests with different successional stages in Western Sichuan, China

HU Zong-Da, LIU Shi-Rong, LUO Ming-Xia, HU Jing, LIU Xing-Liang, LI Ya-Fei, YU Hao, OU Ding-Hua

表3 米亚罗林区不同林型的主要土壤理化性质和有效养分含量(平均值±标准偏差, n = 3)

Table 3 Main soil physical and chemical properties and soil available nutrients in different forest types in Miyaluo forest area (mean ± SD, n = 3)

项目 Item	80-NSF	70-NSF	60-NSF	CK
pH	5.08 ± 0.06^a	5.24 ± 0.16^ab	5.42 ± 0.11^bc	5.54 ± 0.04^c
含水率 Soil water content (%)	57.65 ± 14.58^a	48.68 ± 2.99^a	23.73 ± 4.50^b	68.47 ± 9.99^a
有机碳含量 Soil organic carbon content (g·kg^-1)	98.07 ± 4.08^a	91.28 ± 5.90^a	47.29 ± 1.88^b	124.38 ± 14.70^c
全氮含量 Soil total nitrogen content (g·kg^-1)	8.22 ± 0.57^a	8.90 ± 0.60^a	3.28 ± 0.15^b	11.70 ± 1.03^c
碳氮比 C:N	11.95 ± 0.47^a	10.25 ± 0.03^b	14.40 ± 0.28^c	10.61 ± 0.35^b
全磷含量 Soil total phosphorus content (g·kg^-1)	0.78 ± 0.08^a	1.12 ± 0.14b^c	0.93 ± 0.02^ad	1.06 ± 0.05^cd
全钾含量 Soil total potassium content (g·kg^-1)	16.18 ± 0.47^a	21.69 ± 0.48^b	27.26 ± 0.87^c	23.86 ± 0.23^d
可溶性有机碳含量 Dissolved organic carbon content (mg·kg^-1)	123.57 ± 24.89^a	66.08 ± 5.52^b	45.19 ± 9.09^b	139.01 ± 38.74^a
轻组有机碳含量 Light fraction organic carbon content (g·kg^-1)	25.80 ± 9.00^a	20.85 ± 4.75^ab	14.02 ± 1.09^b	40.26 ± 5.99^c
可溶性有机氮含量 Dissolved organic nitrogen content (mg·kg^-1)	40.84 ± 5.35^a	48.29 ± 7.21^a	18.83 ± 5.64^b	39.03 ± 6.33^a