WANG Yipei,SUN Meimei,CHENG Ranran,et al.Accumulation of Soil Organic Carbon and Its Influencing Factors in Coniferous Plantations in the Midwestern Loess Plateau[J].Research of Soil and Water Conservation,2020,27(03):30-36.
黄土高原中西部人工针叶林浅层土壤有机碳积累及影响因素
- Title:
- Accumulation of Soil Organic Carbon and Its Influencing Factors in Coniferous Plantations in the Midwestern Loess Plateau
- 文章编号:
- 1005-3409(2020)03-0030-07
- 分类号:
- S718.5
- 文献标志码:
- A
- 摘要:
- 林地浅层土壤是凋落物有机质向土壤碳库输移的关键层,对于土壤有机碳积累具有表征作用。为了探究黄土高原中西部3种人工针叶林土壤固碳功能,基于野外调查获取的样地信息和对凋落物、土壤的采样分析,研究了林分条件、凋落物成分以及环境因子对浅层土壤有机碳积累的影响。结果表明:在研究区域内,林龄与浅层土壤碳密度呈现极显著相关关系; 年平均温度对于浅层土壤碳密度无明显影响; 在海拔高于2 000 m的各样地之间,海拔高度与浅层土壤碳密度呈现极显著正相关关系,而低于2 000 m时不存在这种相关关系; 各样地年平均降雨量与浅层土壤碳密度呈现正相关关系,凋落物碳氮比与浅层土壤碳密度呈极显著的负相关关系。运用随机森林法对各影响因子的重要性进行分析排序可知,凋落物成分、气候因子、海拔以及林龄对于全部样地浅层土壤碳密度变异的总解释率为66.2%,其中凋落物碳氮比是影响黄土高原中西部人工针叶林浅层土壤碳积累的主导因子。
- Abstract:
- The shallow soil of forest land is the key layer for the transport of litter organic matter to soil carbon pool, which is indicative of soil organic carbon accumulation. In order to explore the soil carbon sequestration function of three kinds of coniferous plantations in the midwestern Loess Plateau, the effects of stand conditions, litter composition and environmental factors on the accumulation of organic carbon in shallow soils were studied based on the sample land information obtained from field investigation and the sample analysis of litter and soils. The results show that, the age of the forest and the carbon density of the shallow soil have the very significant correlation in this study area; the annual average temperature has no significant effect on the carbon density of the shallow soil; in various areas above 2 000 m above sea level, there is an extremely significant positive correlation between altitude and the carbon density of shallow soil, while there is no such correlation when the altitude is less than 2 000 m; there is the positive correlation between the average annual rainfall of various areas and the carbon density of shallow soil, and there is the very significant negative correlation between the ratio of carbon to nitrogen of litter and the carbon density of shallow soil. According to the results from the random forest approach to sort the importance of each influence factor on soil carbon density function, the total explanatory rate of the those factors to the carbon density of shallow soil changes is 66.2%, among which the ratio of carbon to nitrogen of litter is the dominant factor on carbon accumulation in shallow soil.
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备注/Memo
收稿日期:2019-12-16 修回日期:2019-12-25资助项目:中国科学院战略性先导科技专项资助项目 “中国森林生态系统固碳现状、速率、机制和潜力”(XDA05050202)第一作者:王一佩(1994—),女,陕西省安康市人,在读硕士研究生,主要研究方向为森林生态、流域生态与管理。E-mail:wangyipei8176@163.com通信作者:杜盛(1965—),男,内蒙古鄂尔多斯人,博士,研究员,主要研究方向为森林生态、流域生态与管理。E-mail:shengdu@ms.iswc.ac.cn