亚热带不同树种凋落叶分解对氮添加的响应

陈思路,蔡劲松,林成芳,宋豪威,杨玉盛

Response of leaf litter decomposition of different tree species to nitrogen addition in a subtropical forest

Si-Lu CHEN,Jin-Song CAI,Cheng-Fang LIN,Hao-Wei SONG,Yu-Sheng YANG

表3 亚热带森林不同处理凋落物分解质量残留率随时间的指数回归方程

Table 3 Exponential regression equations of mass remaining rate of leaf litter with time under different treatments in a subtropical forest

树种 Species	处理 Treatment	Olson负指数方程 Olson negative exponential equation	R²	分解常数 Decay constant k (a^-1)	年实际干质量损失率 Annual observed mass loss rate (%)	年预期干质量损失率 Annual predicted mass loss rate (%)	半分解时间 T_50% (a)	95%分解时间 T_95% (a)
米槠 Castanopsis carlesii	CT	Y = 91.26e^-0.440^x	0.949	0.440^Ba	47.794	42.194	1.292	5.941
米槠 Castanopsis carlesii	+N	Y = 96.35e^-0.354^x	0.976	0.354^Bb	34.257	32.435	1.836	8.232
杉木 Cunninghamia lanceolata	CT	Y = 95.79e^-0.354^x	0.969	0.354^Ca	36.242	30.661	1.862	8.366
杉木 Cunninghamia lanceolata	+N	Y = 94.91e^-0.291^x	0.968	0.291^BCa	29.510	28.215	2.245	10.167
观光木 Michelia odora	CT	Y = 81.65e^-0.557^x	0.899	0.557^Aa	49.333	38.934	0.993	5.124
观光木 Michelia odora	+N	Y = 88.03e^-0.447^x	0.934	0.447^Ab	39.768	36.776	1.334	6.481
台湾相思 Acacia confusa	CT	Y = 91.26e^-0.357^x	0.964	0.357^Ca	35.240	31.303	1.798	8.248
台湾相思 Acacia confusa	+N	Y = 96.35e^-0.230^x	0.908	0.230^Cb	24.887	26.328	2.685	13.479