论文部分内容阅读
森林土壤有机碳是全球土壤有机碳库的重要组成部分,研究森林土壤有机碳对于减缓大气中CO2浓度持续升高具有重要的意义。本研究采用野外调查和室内分析相结合的方法,以贵州桦木、栎类、柏木、云南松、杉木、马尾松、华山松等7种主要森林类型为主要对象,分析贵州主要森林类型土壤有机碳密度特征,探讨不同植被类型和环境因子对其的影响。结果表明:(1)贵州森林土壤有机碳密度约为180.62Mg/hm2,高于同纬度地区江西省森林土壤平均有机碳密度102.1Mg/hm2,表现出贵州森林土壤具有较高的固碳能力;(2)不同森林类型土壤有机碳密度变化范围为:114.52~388.29Mg/hm2,且差异显著(P<0.05)。各种森林类型土壤有机碳密度大小为:华山松林>杉木林>柏木林>栎类林>马尾松林>桦木林>云南松林;(3)不同植被类型下各层土壤有机碳密度大小均以表层土壤为最大,且随土壤深度增加而降低;(4)在立地条件上,贵州森林土壤有机碳密度与海拔显著相关,与坡度、经度、纬度相关关系均不显著。
Forest soil organic carbon is an important part of the global soil organic carbon pool. It is of great significance to study forest soil organic carbon to slow down the atmospheric CO2 concentration. In this study, field investigation and indoor analysis were used to analyze the main forest types of Guizhou Province, including birch, oak, cedar, Pinus yunnanensis, Chinese fir, Pinus massoniana and Pinus armandii, Density characteristics of different types of vegetation and environmental factors on its impact. The results showed that: (1) The soil organic carbon density in Guizhou forest was about 180.62Mg / hm2, which was higher than the average organic carbon density of 102.1Mg / hm2 in Jiangxi province at the same latitude, indicating that Guizhou forest soil had higher carbon sequestration (2) The range of soil organic carbon density varied from 114.52 to 388.29 Mg / hm2 in different forest types (P <0.05). The soil organic carbon density in different forest types was as follows: Huashan pine forest> Cypress forest> oak forest> Masson pine forest> birch forest> Yunnan pine forest. (3) (4) On the condition of site, the density of soil organic carbon in Guizhou forest was significantly related to the altitude, but not to the slope, longitude and latitude.