岩性对毛竹林土壤硅形态的影响

Silicon fractions in Phyllostachys edulis soils derived from different parent materials

采取发育于5种不同岩性类型（花岗闪长岩、花岗岩、玄武岩、凝灰岩和页岩）的毛竹Phyllostachys edulis林不同土层（0-20cm和20-40cm）的土样，运用逐级化学提取技术，研究不同岩性条件下发育的土壤中硅的形态以及影响硅转化的因素，为不同岩性类型土壤有效硅调控提供科学参考。结果表明：④不同岩性类型土壤中总二氧化硅质量分数从大到小顺序依次为凝灰岩〉花岗闪长岩〉页岩〉花岗岩〉玄武岩，而且不同岩性之间二氧化硅质量分数差异性较大；②不同岩性类型下发育的毛竹林土壤有效硅质量分数及相对百分比顺序为玄武岩〉花岗岩〉页岩〉花岗闪长岩〉凝灰岩，有效硅主要来源于无定形硅的转化，与土壤中总二氧化硅的质量分数相关性不大；⑧岩性能够影响土壤中总硅数量以及各种硅形态的整体分布。

To provide theory for regulating avilable silicon （Si）in forest soils, silicon forms and available Si conversion from amorphous Si with sequential chemical extraction technology was studied. In Zhejiang Province Phyllostachys edulis stands grown in five different soils derived from five parent matwrials （granodiorites, granite, basalt, tuff, and shale） were sampled at 0-20 and 20-40 cm with three replicates. Results showed that SiO2 decreased in the order： tuff 〉granodiorites 〉shale 〉granite 〉basalt. Available Si and relative per- centage of Si were： basalt〉granite〉shale〉granodiorites〉tuff. Since available Si mainly came from regulat- ing amorphous Si and had little relevance on total Si02 content, soil parent matwrials affected silicon forms and distribution in Ph, edulis forest soils.