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为了探明中国重要丛生竹的硅(Si)储量的大小及空间分布特征,在广东、福建、浙江、云南和四川等丛生竹的主产区选择了8种重要丛生竹(青皮竹、粉单竹、麻竹、绿竹、黄竹、龙竹、缅甸竹和慈竹),通过测定不同丛生竹叶、枝、秆和现存凋落物中的硅含量和生物量,对我国重要丛生竹的硅储量进行了初步估算。结果表明:1 8种丛生竹不同竹龄叶、枝、秆Si含量大小依次表现为叶(12.47~62.71 g·kg-1)>枝(7.66~29.26 g·kg-1)>秆(1.12~11.77 g·kg-1),且各器官中Si含量均低于凋落物(40.86~123.74 g·kg-1);在不同竹种间,绿竹2、3 a叶、枝Si含量均显著高于其他竹种,粉单竹的1、2、3 a秆中的Si含量分别与1 a麻竹、2 a绿竹及3 a缅甸竹存在显著差异;2 8种丛生竹地上部分的总Si储量为5 082.93 kg·hm-2,其中,现存凋落物的贡献率可达51.18%,远大于叶、枝、秆。不同竹种Si储量大小依次为:龙竹>黄竹>慈竹>绿竹>青皮竹>缅甸竹>粉单竹>麻竹;3通过对竹种面积与地上部分总Si储量计算可得,8种重要丛生竹地上部分Si总储量约为41.55×104t Si,目前全国丛生竹地上部分Si总储量约为51.94×104t Si。论文对丛生竹生态系统硅储量的估算能为整个竹林系统以及亚热带森林生态系统硅储量的估测提供一定基础数据。
In order to find out the size and spatial distribution of silicon (Si) reserves of important bamboo species in China, 8 important species of bamboo (pink bamboo, pink single leaf) were selected in the main producing areas of the clustered bamboo in Guangdong, Fujian, Zhejiang, Yunnan and Sichuan, Bamboo, bamboo, green bamboo, yellow bamboo, dragon bamboo, Burma bamboo and Tsz bamboo), through the determination of different clustered bamboo leaves, branches, stalks and existing litter in the silicon content and biomass, Reserves were initially estimated. The results showed that the contents of Si in leaves, branches and stems of 18 species of bamboo at different ages were in the order of leaf (12.47 ~ 62.71 g · kg -1)> (7.66 ~ 29.26 g · kg -1)> 1.12 ~ 11.77 g · kg-1), and the contents of Si in all organs were lower than that of litter (40.86 ~ 123.74 g · kg-1) The contents of Si in 1, 2 and 3 a stems of other bamboo species and powdery bamboo were significantly different from those of 1-a bamboo, 2-a bamboo and 3-a bamboo, respectively. The contents of total Si The reserve was 5882.93 kg · hm-2, of which the litter contribution rate was up to 51.18%, much larger than that of leaves, branches and stalks. The order of the reserves of Si in different bamboo species is as follows: Long bamboo> Yellow bamboo> Ci bamboo> Green bamboo> Green bamboo> Burma bamboo> Monochamus alterniflora> Bamboo; 3 Based on the calculation of bamboo area and aboveground total Si reserves, The total Si reserves of the aboveground part of the eight species are about 41.55 × 104t Si. At present, the total Si of the aboveground part of the clumped bamboo is about 51.94 × 104t Si. The estimation of the amount of silicon reserves in the bamboo ecosystem can provide some basic data for estimating the total amount of silicon in the bamboo forest system and the subtropical forest ecosystem.