神农架3种针叶林土壤碳储量比较

摘要

With three main coniferous forests of Pinus massoniana forest , Pinus amandii forest and Abies fargesii forest in Shen-nongjia Nature Reserve, an experiment was conducted to study the soil organic carbon ( SOC) storage characteristic of three coniferous forests, and the relationship between soil carbon storage with mean diameter at breast height ( DBH) , bio-mass of shrub layer and litter storage.The total SOC storage of three coniferous forests in 0-60 cm layer is 57.79 t· hm-2 , 116.07 t· hm-2 and 170.62 t· hm-2 , respectively, and the SOC storage of A.fargesii forest is 195.24% and 47.00%higher than that of P.massoniana forest and P.amandii forest, and the difference of SOC storage among three forest types is significant (P<0.05).The vertical distribution and storage of SOC in 0-60 cm layer are in contrast.The difference of SOC storage in each layer is significant .There is a positive significant correlation between total SOC storage and mean DBH, and litter storage (P<0.01), while the totalSOC storage is not correlated with shrub biomass (P≥0.05).%以神农架的马尾松林、华山松林和巴山冷杉林3种主要针叶林为研究对象，分析了不同针叶林土壤碳储量特征，以及土壤碳储量与乔木层平均胸径、灌木层生物量、地表层凋落物现存量等因子的关系。结果表明：3种针叶林0～60 cm土壤总碳储量分别为57．79、116．07、170．62 t· hm-2，巴山冷杉林土壤碳储量比马尾松林和华山松林分别高195．24％和47．00％，且3种林型之间差异达到显著性水平（ P＜0．05）。3种针叶林土壤碳储量均随着土层的加深而减小，且土壤碳储量在各土层中差异也达到显著性水平。神农架地区主要针叶林土壤碳储量与平均胸径、凋落物现存量均具有极显著的正相关关系（P＜0．01），而与灌木层生物量相关性不显著（P≥0．05）。