母岩与竹龄对毛竹竹叶中硅和植硅体碳含量的影响

在浙江省毛竹主产区,采集不同母岩类型(花岗岩、砂页岩、凝灰岩)和不同竹龄(1、3年生)的毛竹竹叶样品,研究了不同母岩和竹龄对毛竹叶片中硅与植硅体碳含量的影响,以及竹叶样品中硅和植硅体含量之间的相关关系.结果表明: 母岩、竹龄对毛竹竹叶中硅和植硅体含量均有显著影响,不同母岩土壤毛竹竹叶中硅含量表现为花岗岩(33.19 g·kg^-1)>砂页岩(32.64 g·kg^-1)>凝灰岩(24.51 g·kg^-1),植硅体含量表现为花岗岩(105.81 g·kg^-1)>砂页岩(93.50 g·kg^-1)>凝灰岩(59.40 g·kg^-1);3年生毛竹竹叶中硅与植硅体含量均显著高于1年生.母岩与竹龄对竹叶植硅体碳含量均无显著影响,而对竹叶干物质植硅体碳含量存在显著影响.3种母岩发育土壤上毛竹叶中硅与植硅体含量间呈显著正相关;但1年生竹叶中两者之间无显著相关性.要准确估算全国不同地域、不同土壤类型毛竹竹叶的植硅体含量时,需要考虑母岩、植物株龄的影响.

Effects of parent rock and bamboo age on silicon and phytolith-occluded carbon in the leaves of Moso bamboo.

In order to study effect of parent rocks and bamboo ages on the contents of silicon and phytolith occluded organic carbon (PhytOC) in fresh leaves of Moso bamboo plants as well as the interrelations between silicon and phytolith contents, the fresh leaf samples of Moso bamboo plants with different ages (1- and 3-year old) and different parent rocks (grantie, sandshale and tuff) were collected from the main production area in Zhejiang Province. The results showed that parent rock and bamboo age had a significant impact on the contents of Si and phytolith in fresh leaves of Moso bamboo plants. The contents of Si and phytolith in fresh leaves of Moso bamboo plants on the soils derived from the three parent rocks were in the order of grantie (33.19 g·kg^-1) > sandshale (32.64 g·kg^-1) > tuff (24.51 g·kg^-1), and grantie (105.81 g·kg^-1) > sandshale (93.50 g·kg^-1) > tuff (59.40 g·kg^-1). The contents of Si and phytolith in fresh leaves of 3-year old Moso bamboo plants were significantly higher than those of 1-year old plants. The parent rock and bamboo age did not affect the contents of organic carbon in the phytolith, but affected the PhytOC content in the dry matter. There was significant positive correlation between the Si and phytolith in the leaves from 3-year old Moso bamboo plants on the soils derived from the different parent rocks, but not for the leaves from 1-year old bamboo plants. Both parent rock and bamboo age were important factors affecting the contents of Si and phytolith in the Moso bamboo leaves. Therefore, the accurate estimation of the contents of phytolith in the plants distributed in different regions and diffe-rent soil types in China should consider the influence of parent rock and plant age.