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岩溶植被在岩溶生态系统碳循环和全球碳平衡中具有重要的作用。通过对马山县岩溶次生林年龄序列(幼龄林、中龄林和老龄林)3个演替阶段9个样地(20 m×50 m)的系统取样调查,研究了停止人为干扰后岩溶次生林生物量和碳储量的变化。结果表明:沿幼林、中林和老林群落的顺向演替发展,群落生物量显著增加(P<0.05),从幼林群落的48.17 t/hm2、到中林群落113.47 t/hm2,再到老林群落242.59 t/hm2。老林生态系统的碳储量较高,平均为236.69 t/hm2,中林和幼林较低且非常相近,分别为225.17 t/hm2和224.76 t/hm2,各次生林生态系统的碳储量差异不显著(P>0.05)。土壤碳储量的大小顺序为幼林(198.44 t/hm2)>中林(167.39 t/hm2)>老林(113.43 t/hm2)。沿群落正向演替,各次生林生态系统中植物碳储量和土壤碳储量的比例发生明显的变化。幼林的土壤碳储量占生态系统碳储量的88.29%,植物碳储量只占11.71%;中林相应为74.34%和25.66%;而老林为47.92%和52.08%。可见,随着岩溶植被的正向演替,土壤碳转变为植物碳的趋势十分明显,这是岩溶森林不同于酸性土森林的一个显著特征。
Karst vegetation plays an important role in carbon cycle and global carbon balance in karst ecosystems. A systematic sampling survey of nine succession stages (20 m × 50 m) of karst secondary forest age series (young forest, middle-aged forest and aged forest) in Mashan County was carried out to study the effects of stopping artificial disturbance karst secondary forest Changes in biomass and carbon stocks. The results showed that along the forward succession of young forest, middle forest and old forest community, the community biomass increased significantly (P <0.05), from 48.17 t / hm2 in young forest community to 113.47 t / hm2 in middle forest community, The community is 242.59 t / hm2. The carbon stocks of the forest ecosystems were high with an average of 236.69 t / hm2. The middle and young forests were low and very similar, with 225.17 t / hm2 and 224.76 t / hm2, respectively. There was no significant difference in carbon stocks between different ecosystems > 0.05). The order of soil carbon storage was young forest (198.44 t / hm2)> middle forest (167.39 t / hm2)> old forest (113.43 t / hm2). Along the positive succession of community, the proportion of plant carbon storage and soil carbon storage in each forest ecosystem changed obviously. Soil carbon storage in young forest accounted for 88.29% of the total ecosystem carbon storage and plant carbon storage accounted for only 11.71%; the middle forest was 74.34% and 25.66%; the old forest was 47.92% and 52.08%. It can be seen that with the positive succession of karst vegetation, the trend of soil carbon to plant carbon is obvious, which is a distinctive feature of karst forest different from acid soil forest.