不同林龄杨树人工林碳储量研究

Study on carbon storage of poplar plantation at different stand ages

基于盐城市东台林场杨树人工林的生物量调查和土壤碳测定,探讨了不同发育阶段杨树人工林碳储量的时空变化规律。结果表明,随林龄的增加,杨树人工林生态系统碳储量增加,群落总碳储量的空间分布序列是:土壤层(130.87 t·hm-2)>乔木层(56.32 t·hm-2)>枯落物层(1.2 t·hm-2)>林下植被层(0.37 t·hm-2);乔木层碳储量和林木各器官碳储量均随林龄的增加而总体呈上升趋势;林下植被层和枯枝落叶层碳储量呈先上升后下降的趋势;土壤层碳储量先增加后下降,但其占杨树人工林总碳储量的比例逐渐降低。研究认为杨树人工林固碳潜力巨大,且不同发育阶段的杨树人工林碳储量差异主要是由乔木层碳储量差异引起的。

In this paper, biomass, carbon storage and soil organic carbon of poplar stands at ages of 4, 8, 12, 15 and 20 years-old were studied, based on the survey of sample plots in Dongtai poplar plantation, Jiangsu. The methods of allometric growth function and sampling harvest were used to investigate the biomass of tree layer, underground vegetation layer and forest floor. With the stand ages increased, the total carbon storage in the five stands increased as well. Besides the spatial carbon storage distributed as the follows： soil layer （130.87 t·hm^-2）〉 tree layer （56.32t·hm^-2）〉 forest floor （1.2t·hm^-2）〉 underground vegetation layer （0.37t·hm^-2）. The dynamic trend of carbon storage of underground vegetation layer and forest floor in different stages enhanced firstly and then decreased. In different stands, carbon concentration showed the similar tendency. Our study suggested that poplar plantation had a huge potential for carbon sequestration and that the differences in carbon storage of poplar plantation at different stand ages were mainly caused by the carbon storage of tree layer.