关键词: 落叶松, 红松, 复层林, 碳汇动态, 经营模式

Abstract: We analyzed the carbon sink status of different management modes of larch plantations in Liaoning Pro-vince using data from a second-class survey, and predicted the dynamics of carbon sink under different management modes by using tree ring data from sample plots. The main aim was to provide technical support for improving carbon sequestration capacity of larch plantations. The results showed that the maximum carbon densities of larch and Korean pine plantations were 70.24 and 63.33 t·hm^-2, respectively. The carbon sequestration potential of current plantations was 11.66 Tg. With the cycle of forest management, carbon sequestration rates of larch (40 years) and Korean pine (80 years) plantations were 1.62 and 0.66 t·hm^-2·a^-1, respectively. The carbon maturity age of larch plantations was 22 years, and stopping the rotation at this age could increase carbon sequestration by 43.8%. Under the larch-Korean pine multi-storied forest model, it was best to plant Korean pine seedlings in 30-year-old larch plantations, and to remove larch trees between 45- and 50-year-old larch plantations. Compared to the larch continuous cropping model, it reduced accumulated stand carbon sink by 36.4% and increased stand carbon density by 18.1%. Under the larch-Korean pine-Fraxinus mandshurica multi-storied forest model, it was best to plant F. mandshurica seedlings in 60-year-old Korean pine plantations, and to selecting cut Korean pine trees in 130-year-old. It increased accumulated stand carbon sink by 2.6% than larch continuous cropping and by 28.1% than Korean pine continuous cropping, and increased stand mean carbon density by 12.6% than Korean pine continuous cropping. The multi-storied forest model could reduce soil carbon loss and maintain arbor and soil carbon sinks. Inducing larch plantations into Korean pine-broadleaf mixed forests would facilitate stand carbon density and carbon sink.

Key words: larch, Korean pine, multi-storied stand, carbon sink dynamic, management pattern