摘要:选取贵州高原型喀斯特次生常绿落叶阔叶混交林为对象，对其生态系统各组分碳（C）、氮（N）、磷（P）生态化学计量特征进行了研究，并全面估算了其生态系统C、N、P储量。结果表明，N、P含量在各树种和各器官（干、皮、枝、叶）之间表现出较大的变异，而C含量在各树种和各器官之间变异较小。C/N和C/P表现为叶片最高，树干（乔木）/枝干（灌木）最低，N/P在各器官间差异不显著（P > 0.05）。凋落物和木质残体的N/P显著（P < 0.01）高于植物活体。土壤C、N、P含量均随土壤深度的增加而降低，最表层（0-10 cm）土壤的C、N、P含量及N/P显著（P < 0.05）高于深层土壤；C/N和C/P在各土层间差异不显著（P > 0.05）。高原型喀斯特次生常绿落叶阔叶混交林的生态系统C、N、P储量分别为172.42 Mg/hm²、5.24 Mg/hm²和1.19 Mg/hm²。大部分森林C（54.69%）、N（84.46%）、P（97.26%）存储于土壤中。与非喀斯特森林相比，喀斯特森林植物叶片N、P含量低，土壤C含量高，生态系统C、N、P储量低。



Abstract:Carbon (C), nitrogen (N) and phosphorus (P) stoichiometry characteristics and storages of all components in a secondary plateau-surface karst evergreen and deciduous broad-leaved mixed forest in central Guizhou Province, southwestern China, are analyzed and estimated. Results show N and P concentrations vary greatly among species and organs. C/N and C/P are highest in leaf and lowest in stem. N/P shows no significant (P > 0.05) differences among organs. Litter and woody debris present significantly (P < 0.01) higher N/P than live vegetation. Soil C, N and P concentrations decrease with increasing soil depth. Soil C, N and P concentrations and N/P in the first top layer (0-10 cm) are significantly (P < 0.05) higher than those in deeper soils. C/N and C/P show no significant (P > 0.05) differences among soil layers. C, N and P storages of the entire forest are 172.42, 5.24 and 1.19 Mg/hm², respectively. Most C (54.69%), N (84.46%) and P (97.26%) are stored in soils. Compared with nonkarst forests, the karst forest presents lower leaf C and N concentrations, higher soil C concentration and lower C, N and P storages.





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