三种不同生态型竹种植硅体碳汇比较研究

Comparison of Phyt OC Sink for Three Different Ecotypes of Bamboos

为研究不同生态型竹种生态系统中植硅体碳的分布和积累特征,论文选取了浙江省境内发育于同一土壤类型的3种竹林生态系统,分别采集其不同年龄的地上部分(叶、枝、秆)和现存凋落物以及不同深度的土样,分析各样品的植硅体含量、植硅体碳含量和硅含量。结果表明:1)3种不同生态型竹种器官中植硅体和植硅体碳积累和分布特征均为叶>枝>秆,土壤中植硅体和植硅体碳储量达到最大,且随土层深度增加植硅体碳储量有增加趋势;2)通过3种竹种植硅体碳储量比较,散生竹高节竹生态系统植硅体储量最高,丛生竹绿竹和混生竹茶秆竹植硅体碳储量相近;3)根据3种竹种在全国的分布面积估算,茶秆竹生态系统总固碳能力略大于绿竹,而远远高于高节竹。

In order to study the distribution and accumulation characteristics of PhytOC in the different ecotypes of bamboo species, in this study, we selected three bamboo ecosystems which developed in the same type of soil in Zhejiang Province. The samples were collected from the above ground part of bamboo at different ages （leaves, branches, stems）, existing litters and soils at different depths, and the content of phytolith, PhytOC and silicon in each sample were analyzed. The results showed that： 1） The accumulation and distribution of contents of phytolith and PhytOC in organs of the three kinds of bamboos are in the same order that is leaf 〉 branch 〉 stalk. The maximum contents of phytolith and PhytOC are in the soil, and the content of PhytOC goes up with the increase of soil depth. 2） As for the stocks of PhytOC in the three kinds of bamboos, the stock of PhytOC in Phyllostachys prominens ecosystem is the maximum, while the stocks of PhytOC in Dendrocalamopsis oldhami and Pseudosasa amabilis ecosystem are almost equal. 3） According to the estimated areas of the three bamboo species, the total carbon sequestration capacity of Pseudosasa amabilis ecosystem is slightly larger than that of Dendrocalamopsis oldhami, and is much larger than that of Phyllostachys prominens.