马尾松与红椎纯林及混交林生态系统碳储量研究

Study on carbon storage of monoculture and mixed plantation of Pinus massoniana and Castanopsis hystrix

为了解树种与造林模式对人工林生态系统碳储量的影响,在南亚热带相同立地上,采用样地调查方法,对33年生马尾松纯林(PCL)、红椎纯林(CCL)、马尾松×红椎同龄混交林(PCM)生态系统碳储量进行了研究。结果表明:PCM、PCL、CCL人工林生态系统碳储量分别为:235.38、196.40、144.59t/hm^2,处理间差异显著(P<0.05),混交林生态系统碳储量显著高于纯林,马尾松纯林显著高于红椎纯林。PCM、PCL、CCL人工林生态系统碳储量在不同层次的分配比例,乔木层分别为:53.70%、54.05%、33.02%;地被物层为:1.47%、2.06%、1.37%;土壤层为:44.83%、43.89%、65.61%。生态系统碳储量在不同层次分配比例排序,PCM、PCL都为乔木层>土壤层>地被物层;CCL为土壤层>乔木层>地被物层,乔木层和土壤层碳储量占生态系统碳储量的97.94%~98.63%,地被物层仅占1.37%~2.06%。

In order to understand the effects of tree species and planting patterns on carbon storage in plantation ecosystem, the carbon storage in 33-year-old pure Pinus massoniana forest (PCL), pure Castanopsis hystrix forest (CCL) and their even-age mixed forest (PCM) were studied by plot investigation. The results showed that there were significant differences in the carbon storage of PCM, PCL and CCL plantation ecosystems (P < 0.05).The carbon storage contents were 235.38, 196.40 and 144.59 t/hm^2 respectively. The carbon storage in mixed plantation ecosystem was significantly higher than that in pure plantation,while in pure plantation, PCL was significantly higher than that of CCL. The distribution ratio of carbon storage in different tree species and models was different in different layers, in the arbor layer the ratio was 53.70%、54.05%、33.02%;in the ground cover was 1.47%、2.06%、1.37%;and in the soil layer was 44.83%、43.89%、65.61%. The distribution ratio of PCM,PCL was the highest in the arbor layer, followed by the soil layer and then the ground cover layer. While the soil layer was the highest, followed by the arbor layer and then the ground cover layer of CCL The proportion of carbon storage in the arbor layer and soil layer is 97.94%-98.63% of the total carbon storage in ecosystem, while that in ground cover layer is only 1.37%-2.06%.