■以大理市仓山国家级自然保护区为研究对象,阐明了滇西不同海拔地区土壤有机碳(SOC)和植被类型的垂直分布特征。
■SOC的内容,轻馏分有机碳(LFOC),重馏分有机碳(HFOC),测定了不同海拔(2,400、2,600、2,800、3,200、3,400和3,600m)0-30cm土壤层中的水溶性有机碳(WSOC),研究了不同海拔的地上植被类型。
■结果表明,SOC含量在0-20cm表层土壤中最高,并随着土壤层的加深而逐渐降低。它随着海拔的增加而增加,然后减少,它在3,000m处达到峰值。LFOC含量在1.28至7.3515gkg-1之间。它表现出下降的趋势,轮廓分布变化很小。HFOC含量在12.9727和23.3708gkg-1之间;随着剖面深度的增加,它增加然后减少。WSOC含量在235.5783~392.3925mgkg-1之间,对海拔变化的反应敏感性较弱。随着标高的增加,WSOC/SOC和LFOC/SOC表现出相似的趋势,而HFOC呈现相反的趋势。该观察结果表明,3,600m处的活性有机碳含量低于2,400m处的活性有机碳含量,中海拔有利于活性有机碳的储存。同时,土壤理化性质在一定程度上影响了有机碳的分布。植被类型调查表明,在2,400-2,800m范围内的地上优势种是云南松和华山松。许多常绿和混合针叶阔叶林分布在3,000m至3,200m之间。冷杉的种类主要分布在3,400m至3,600m之间。该研究为高海拔地区森林土壤碳稳定性研究提供了参考,并在制定合理的土地利用管理政策方面发挥了重要作用。保护森林土壤,减少有机碳损失,并调查了森林生态系统的固碳稳定性。
UNASSIGNED: The Cangshan National Nature Reserve of Dali City was adopted as the research object to clarify the vertical distribution characteristics of soil organic carbon (
SOC) and vegetation types at different elevations in western Yunnan.
UNASSIGNED: The contents of
SOC, light fraction organic carbon (LFOC), heavy fraction organic carbon (HFOC), and water-soluble organic carbon (WSOC) in the 0-30 cm soil layer at different elevations (2,400, 2,600, 2,800, 3,000, 3,200, 3,400, and 3,600 m) were determined, and the above-ground vegetation types at different elevations were investigated.
UNASSIGNED: Results showed that the
SOC content was the highest in 0-20 cm surface soil and gradually decreased with the deepening of the soil layer. It increased then decreased with the increase in elevation, and it peaked at 3,000 m. The LFOC content was between 1.28 and 7.3515 g kg-1. It exhibited a decreasing trend and little change in profile distribution. The HFOC content ranged between 12.9727 and 23.3708 g kg-1; it increased then decreased with the increase in profile depth. The WSOC content was between 235.5783 and 392.3925 mg kg-1, and the response sensitivity to elevation change was weak. With the increase in elevation, WSOC/
SOC and LFOC/
SOC showed a similar trend, whereas HFOC presented an opposite trend. This observation indicates that the active organic carbon content at 3,600 m was lower than that at 2,400 m, and the middle elevation was conducive to the storage of active organic carbon. Meanwhile, the physical and chemical properties of soil affected the distribution of organic carbon to a certain extent. The vegetation type survey showed that the above-ground dominant species within 2,400-2,800 m were Pinus yunnanensis and Pinus armandii. Many evergreen and mixed coniferous broadleaf forests were distributed from 3,000 m to 3,200 m. Species of Abies delavayi were mainly distributed from 3,400 m to 3,600 m. This research serves as a reference for the study of forest soil carbon stability in high-elevation areas and plays an important role in formulating reasonable land use management policies, protecting forest soil, reducing organic carbon loss, and investigating the carbon sequestration stability of forest ecosystems.