基于FORECAST模型的塞罕坝机械林场森林碳储量动态变化

Dynamic Changes of Forest Carbon Storage in Saihanba Mechanical Forest Farm Based on Forecast Model

运用FORECAST模型,模拟不同立地条件下不同混交比例的塞罕坝机械林场华北落叶松和白桦混交林的碳储量时空变化,结果表明:落桦混交比例1∶2、1∶3和1∶4林分土壤碳储量在6个轮伐期内呈现上升趋势。落桦比为2∶1和1∶1混交林在6个轮伐期内土壤有机碳储量呈下降趋势,且华北落叶松比例越高,土壤退化程度越严重。落桦比为1∶2的混交林在一个生长周期内碳储量最大,并且这种营林方式也有利于土壤有机碳库的积累。无论是从经济价值的角度还是从改良土壤有机碳库的角度来讲落桦比为1∶2能够积累更多的碳储量。

The forecast model was used to simulate the temporal and spatial changes of soil carbon storage in the North China Larch and Betula platyphylla mixed forests with different mixing ratios in Saihanba mechanical forest farm under different site conditions.The results showed that the soil carbon storage of the 1∶2,1∶3 and 1∶4 mixed Betula platyphylla stands showed an upward trend in six rotation periods.The soil organic carbon storage of the mixed forest with 2∶1 and 1∶1 birch ratio showed a downward trend in the six rotation periods.The higher the proportion of Larix principis rupprechtii,the more serious the soil degradation.The mixed forest with birch ratio of 1∶2 has the largest carbon storage in a growth cycle,and this kind of forest management is also conducive to the accumulation of soil organic carbon pool.Whether from the perspective of economic value or from the perspective of improving soil organic carbon pool,birch ratio of 1∶2 can accumulate more carbon storage.