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以吉林省前郭水田区为研究对象,空间尺度代替时间尺度方法,采用开发时间4～55 a共7个不同年限的土壤实测数据,研究1 m水田剖面土壤有机碳含量(SOC)的垂向分布规律,探讨近20年来水田土壤碳源、汇,估算了前郭水田土壤有机碳库储量,并结合吉林西部第二次土壤普查数据,进行不同土地利用类型土壤SOC的差异特征对比分析.结果表明,水田SOC自上而下逐层递减,随着开发年限的增加总体呈增长趋势,表土层(0～30 cm)有机碳储量(1 820.79 t)占1 m深土壤总有机碳储量(3 885.05 t)的46.87%,不同土地利用类型的土壤有机碳密度(SOCD)差异很大,从大到小依次为水田、旱田、盐碱地,水田开发是一个SOC积累的碳汇过程,有利于实现有机碳由表土层向底土层的转移.
Taking Qianqiu paddy field in Jilin Province as the research object and the spatial scale instead of the time scale method, the soil actual data of 7 different years with the developmental period of 4 ~ 55 years were used to study the vertical distribution of soil organic carbon (SOC) Distribution of soil carbon sources and sinks in paddy soils in the past two decades, and to estimate the SOC storage of Qiankui paddy soils. Based on the second soil census data in the western Jilin Province, a comparative analysis of the SOC characteristics of different land use types was conducted. Results The SOC of paddy field SOC decreased gradually from top to bottom and increased with the increase of development years. The topsoil (0 ~ 30 cm) organic carbon storage (1 820.79 t) accounted for 1 m of total soil organic carbon storage (3 885.05 t). The soil organic carbon density (SOCD) of different land use types differed greatly from big to small, which was paddy field, upland field, saline-alkali land and paddy field, which was a SOC accumulation carbon sequestration process, which was conducive to the organic Carbon from the topsoil to the bottom of the transfer.