海螺沟冰川退缩区原生演替序列植被碳氮储量动态

Dynamic of Carbon and Nitrogen Storage Along a Primary Succession Chronosequence in the Foreland of Hailuogou Glacier

在贡嘎山海螺沟冰川退缩区,对植被原生演替序列,选择冰川退缩后第5,27,37,47,53,59,87,127,157年9个演替阶段为对象,进行了不同演替阶段的乔木、灌木、草本及植被总体生物量和碳氮储量调查。结果显示:随着演替时间的推进,植被总生物量呈波动性增加,从0.95 t/hm^2增至163.79 t/hm^2。植被不同层次中,乔木层生物量占活体植物总生物量的比例最大,达94.5%以上。不同演替阶段植被碳氮储量的变化与其生物量的变化相似。植被总碳、氮储量从演替初期到顶级群落波动性增加,分别从0.40 t/hm^2,0.01 t/hm^2增至88.45 t/hm^2,1.76 t/hm^2。不同演替阶段乔木层碳、氮储量分别为35.27~99.85 t/hm^2,1.11~1.99 t/hm^2,占总碳、氮储量的92.8%和93.4%以上,是不同演替阶段植被碳氮储量的主体。研究表明灌木层和草本层的碳氮储量对植被碳氮总储量的贡献较低。

The dynamics of vegetational biomass and the carbon and nitrogen storage along the successional chronosequence in the foreland of Hailuogou Glaicier were investigated.The results showed that the total plant biomass presented the volatile increase with the successional process,increased from 0.95 t/hm^2 to 163.79 t/hm^2;as the most important components of the ecosystem,trees contributed more than 94.5%of the living plant biomass;vegetation carbon and nitrogen storage increased from 0.40 t/hm^2 and 0.01 t/hm^2 in the early succession stage,to 88.45 t/hm^2 and 1.76 t/hm^2 in the late succession stage,espectively;the storgae of carbon and nitrogen in trees was 35.27~99.85 t/hm^2 and 1.11~1.99 t/hm^2,respectively,accounting for 92.8%and 93.4%of the total vegetaion carbon and nitrogen pools,respectively.The carbon reserves of shrub and herbaceous layer contributed less to the total carbon and nitrogen reserves of vegetation.