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1 试验地林分基本特征和土壤表层(0-10 cm)理化性质

Table 1 Main characteristics of the experiment site and properties of the topsoil (0-10 cm)

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 平均树高 Average tree height (m) 10.80 13.70 平均胸径 Average breast diameter (cm) 12.20 16.80 林分密度 Stand density (株?hm-2) 3788 2158 年凋落物量 Annual litter fall (g?m-2) 698 658 细根生物量 Fine root biomass (kg?m-3) 0.93 0.70 全C含量 Total carbon content (g?kg-1) 20.98 16.68 全N含量 Total nitrogen content (g?kg-1) 1.42 1.14 土壤容重 Soil bulk density (g?cm-3) 0.95 1.10