长宁毛竹和苦竹有机碳空间分布格局

The Spatial Distribution of Organic Carbon in Phyllostachys pubescens and Pleioblastus amarus in Changning County

有机碳含量和储量研究有助于评价森林的碳汇功能。长宁毛竹和苦竹的种群生物量分别为:51.51 t.hm-2和43.92 t.hm-2,碳汇储量较低。长宁毛竹和苦竹的生产力分别为:17.66 t.hm-2.a-1和18.62 t.hm-2.a-1,生产力水平偏高,固碳能力较强。毛竹和苦竹生产力随年龄增加而降低,适当年龄内采伐利于提高竹林的生产力。毛竹和苦竹本身的有机碳含量偏高,平均为539.7071 g.kg-1和573.3786 g.kg-1,在根和鞭中含量较低,杆、枝和蔸含量较高。毛竹和苦竹体内总的有机碳储量为27.02 t.hm-2和23.23 t.hm-2,每年固定的有机碳量为9.6 t.hm-2和10.23 t.hm-2。最后,综合评价了毛竹和苦竹林经营在发挥碳汇功能方面的优势。

The studies of organic carbon content and reserve are beneficial to scintific evaluating the carbon sink function of forest. There were 51.51 t · hm^-2 and 43.92 t · hm^-2 in biomass and 17.66 t · hm^-2 · a^-1 and 18.62 t · hm^-2 · a^-1 in productivity respectively in Phyllostachys pubescens and Pleioblastus amarus. The bamboo forests in Changning County had a lower carbon deposition and a higher function for fixing carbon. The age distribution of productivity in Phyllostachys pubescens and Pleioblastus amarus demonstrated that the productivity would decrease with the increase of bamboo age, implying that cutting within a moderate age was advantageous to enhancing the bamboo forest productivity. Phyllostachys pubescens and Pleioblastus amarus had a higher carbon content, averaging 539. 7071 g · kg^-1 and 573. 3786 g · kg^-1 respectively, which were distributed more in roots and rhizomes and less in poles, branches and the root ball. These two bamboos deposited 27.02 t · hm^-2and 23.23 t · hm^ -2 in total organic carbon and fixed 9.6 t · hm^-2 and 10.23 t · hm^-2 respectively every year. Finally, the advantage of carbon sink function in forest management of Phyllostachys pubescens and Pleioblastus amarus was synthetically evaluated.