凋落物输入改变对亚热带两种米槠次生林土壤酶活性的影响

魏翠翠,刘小飞,林成芳,李先锋,李艳,郑裕雄

Response of soil enzyme activities to litter input changes in two secondary Castanopsis carlessii forests in subtropical China

Cui-Cui WEI,Xiao-Fei LIU,Cheng-Fang LIN,Xian-Feng LI,Yan LI,Yu-Xiong ZHENG

表3 两种米槠林添加和去除凋落物处理土壤理化性质和微生物生物量碳、微生物生物量氮含量的变化(平均值±标准偏差, n = 3)

Table 3 Soil physical, chemical properties and microbial biomass carbon and nitrogen contents in the litter removal, control, and litter addition treatments plots in the two Castanopsis carlesii forests (mean ± SD, n = 3)

项目 Item 米槠次生林 Secondary Castanopsis carlesii forest 米槠人促更新次生林 Human-assisted naturally regenerated Castanopsis carlesii forest 对照 Control 凋落物去除 No litter 凋落物添加 Double litter 对照 Control 凋落物去除 No litter 凋落物添加 Double litter 含水量 Moisture content (%) 0.30 ± 0.00aA 0.23 ± 0.01bA 0.29 ± 0.03abA 0.26 ± 0.06aA 0.21 ± 0.01aA 0.25 ± 0.03aA pH值 pH value 5.11 ± 0.14aA 5.10 ± 0.04aA 4.91 ± 0.16aA 5.25 ± 0.17aA 5.11 ± 0.02aA 5.13 ± 0.10aA 全碳 Total carbon (g·kg-1) 20.98 ± 2.75aA 12.41 ± 1.75bA 16.49 ± 0.47bB 16.68 ± 0.44aB 12.77 ± 0.09bA 14.71 ± 3.00abA 全氮 Total nitrogen (g·kg-1) 1.42 ± 0.09aA 0.93 ± 0.12cA 1.14 ± 0.02bB 1.14 ± 0.09aB 0.88 ± 0.07bA 1.02 ± 0.19abA 可溶性有机碳 Dissolved organic carbon (mg·kg-1) 49.15 ± 8.37aA 29.77 ± 9.46bA 55.58 ± 8.7aA 48.86 ± 6.76aA 47.11 ± 10.09aA 49.52 ± 6.46aA 可溶性有机氮 Dissolved organic nitrogen (mg·kg-1) 2.08 ± 0.02aA 1.85 ± 0.09aA 0.74 ± 0.15bB 2.26 ± 0.36aA 2.18 ± 0.43aA 1.86 ± 0.44aA NH4+ (mg·kg-1) 37.49 ± 0.69bA 26.5 ± 3.21cA 52.6 ± 0.6aA 26.99 ± 4.01bB 22.04 ± 3.12aA 29.63 ± 4.41aB 矿质氮 Mineral nitrogen (mg·kg-1) 38.08 ± 0.52bA 27.22 ± 3.31cA 53.05 ± 0.82aA 27.96 ± 3.94aB 22.37 ± 3.24bA 30.98 ± 4.41aB 微生物生物量碳 Microbial biomass carbon (mg·kg-1) 315 ± 33abA 225 ± 66bA 371 ± 57aA 258 ± 17aB 171 ± 5cA 221 ± 23bB 微生物生物量氮 Microbial biomass nitrogen (mg·kg-1) 29.33 ± 6.30aA 13.41 ± 2.27bA 26.38 ± 5.36aA 36.56 ± 3.49aA 14.61 ± 2.58cA 23.05 ± 5.07bA