摘要
高纬度多年冻土区是对气候变化响应最敏感的区域,多年冻土退化严重影响土壤碳循环过程,揭示不同地表覆盖类型下多年冻土区土壤有机碳的垂直分布规律,对于预测未来多年冻土区土壤碳库变化有重要意义。本研究以大兴安岭高纬度多年冻土区森林、森林沼泽、灌丛沼泽为研究对象,利用钻探法采集土柱(7~8m),对3种不同植被下的土壤碳(有机碳、可溶性有机碳)进行测定,进一步分析土壤碳含量的垂直分布特征。结果表明,随着深度增加,土壤碳含量降低,有机碳含量变化范围为14.55~95.98g/kg(森林沼泽)、17.48~132.93g/kg(森林)、2.58~396.50 g/kg(灌丛沼泽),但在多年冻土层中也存在较高碳含量的情况;活动层土壤有机碳和可溶性有机碳平均含量均表现为:灌丛沼泽>森林>森林沼泽,多年冻土层土壤有机碳和可溶性有机碳平均含量均表现为在森林沼泽>森林>灌丛沼泽;各组分碳在活动层的变异系数表现为30.31%~114.26%,各组分碳在多年冻土层的变异系数表现为30.23%~192.09%;相关分析表明,土壤碳与深度和pH呈负相关,与土壤水分显著正相关。
High latitude permafrost regions are the most sensitive areas to climate change.The degradation of permafrost seriously affects the soil carbon cycling process.Revealing the vertical distribution pattern of soil organic carbon in permafrost layers under different land cover types is of great significance for predicting fu-ture changes in soil carbon pools in permafrost regions.Here we select forests,forest swamps,and shrub swamps in the high latitude permafrost areas of the Da Hinggan Mountains.Soil columns(7-8 m)were collec-ted using drilling methods to measure soil carbon(organic carbon,soluble organic carbon)under the three dif-ferent land types,and further analyzed the carbon content at different depths.The results showed that as the depth increased,the soil carbon contents decreased,and the organic carbon content varied from14.55 g/kg to 95.98 g/kg(forest swamp),from 17.48 g/kg to 132.93 g/kg(forest),and from 2.58 g/kg to 396.50 g/kg(shrub swamp).There was also a high carbon content soil layer in permafrost layers.The average content of organic carbon and soluble organic carbon in the active layer soil is as follows:shrub swamp>forest>forest swamp,and the average content of organic carbon and soluble organic carbon in the permafrost layer soil is as follows:forest swamp>forest>shrub swamp.The correlation analysis revealed significant negative correlations between depth and soil organic carbon content,water-soluble organic carbon content,and soil water content in soils un-der forest and shrub swamp conditions.However,there was no significant correlation between depth and these indices in soils under forest swamp conditions.Additionally,pH values were significantly positively correlated with depth across all soils,while they were negatively correlated with soil organic carbon content,soluble or-ganic carbon content,and soil water content.The coefficient of variation of organic carbon in the active layer is 30.31%-114.26%,and the coefficient of variation of organic carbon in the permafrost layer is 30.23%-192.09%.Correlation analysis showed that soil organic carbon was negatively correlated with depth and pH,and significantly positively correlated with soil moisture.
作者
张紫豪
王迪
吴祥文
李天瑞
郑智超
何俭翔
刘立新
臧淑英
Zhang Zihao;Wang Di;Wu Xiangwen;Li Tianrui;Zheng Zhichao;He Jianxiang;Liu Lixin;Zang Shuying(Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions,Harbin Normal University,Harbin 150025,Heilongjiang,China;Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety,Harbin 150025,Heilongjing,China;National Institute of Natural Hazards,Beijing 100085,China)
出处
《地理科学》
CSSCI
CSCD
北大核心
2024年第3期534-542,共9页
Scientia Geographica Sinica
基金
科技基础资源调查专项项目(2022FY100701)
国家自然科学基金联合基金重点项目(U20A2082)
国家自然科学基金项目(41971151)
博士科研启动基金项目(XKB202203)资助。
关键词
大兴安岭
活动层
多年冻土层
土壤碳
土壤水分
Da Hingan Ling Prefecture
active layer
permafrost
soil carbon
soil moisture
