熊耳山自然保护区短柄枹次生林土壤碳氮储量分布格局研究

Quercus Serrata Var. Brevipetiolata Forest Area of Soil Organic Carbon and Nitrogen Storage in the Distribution Pattern of the Xiong'er Mountain Nature Reserve

以熊耳山自然保护区短柄枹次生林土壤为研究对象,采用土壤剖面调查方法,分析比较了熊耳山自然保护区短柄枹次生林土壤碳氮储量和碳氮比与海拔和林龄的关系.结果表明:熊耳山自然保护区短柄枹次生林土壤碳储量的极小值和极大值分别为15.12 t/hm^2,54.87 t/hm^2,平均值为37.25 t/hm^2;土壤氮储量的极小值和极大值分别为0.83 t/hm^2,3.51 t/hm^2,平均值为2.24 t/hm^2.土壤碳储量、氮储量与海拔均呈极为显著的线性关系,变化趋势一致,拟合方程精度较高,具有很高的实用价值.土壤碳氮比与林龄负线性相关显著,不同林龄土壤碳氮比处于25.71~28.85之间.该研究揭示了熊耳山自然保护区短柄枹次生林土壤碳氮储量的空间分布规律,对于熊耳山自然保护区应对气候变化和森林生态系统的管理与保护具有重要的指导意义.

This paper uses the Quercus serrata var. brevipetiolata secondary forest soil of Xiong’er Mountain NaturalProtection as the research object and the soil profile as the survey method,also analyses and compares the Quercusserrata var. brevipetiolata forest soil carbon and nitrogen storage of Xiong’er Mountain Natural Protection,includingthe C/N ratio,altitude and stand age. The results show that the minimum and maximum of the Quercus serrata var.brevipetiolata forest soil carbon reserves of Xiong’er Mountain Natural Protection are 15.12 t/hm^2 and 54.87 t/hm^2,theaverage value is 37.25 t/hm^2. The soil nitrogen storage minimum and maximum are 0.83 t/hm^2 and 3.51 t/hm^2 with anaverage value of 2.24 t/hm^2. There is a significant linear relationship between soil carbon storage,nitrogen storage andaltitude. The change trend is consistent. The fitting equation has a higher accuracy. The research has the high practicalvalue. The C/N ratio and age have the significantly negative linear correlation,and the C/N ratio of soil is between25.71% and 28.85%. The study reveals the Quercus serrata var. brevipetiolata forest soil carbon and nitrogen storagespace distribution and has the important guiding significance of responding the climate change and forest ecologicalsystem management and protection in Xiong’er Mountain Natural Protection.