亚热带重要森林类型土壤植硅体碳的研究
发布时间：2019-05-15 18:04
【摘要】：植硅体是植物根部吸收土壤中可溶性的硅(H4SiO4),在植物的蒸腾作用下,沉淀在细胞、细胞间或细胞壁中,通过植物自身硅化作用而形成的固体非晶质颗粒。植物在形成植硅体的过程中,会将一部分有机碳包裹进去,这部分封存的有机碳就称之为植硅体碳(Phytolith-occluded organic carbon,PhytOC)。植硅体碳受外部抗风化、耐腐蚀的植硅体的包围,可以长期稳定地封存在土壤中,从而成为陆地土壤长期(万年尺度)固碳的重要机制之一。中国亚热带森林分布广阔,植被类型丰富,土壤发育的母质各不相同。毛竹林、杉木林、阔叶林和针阔混交林是其主要的森林类型,研究不同森林类型土壤植硅体碳及其固碳潜力具有重要意义。本研究以发育于不同岩性(流纹岩、砂页岩和凝灰岩)的不同森林类型土壤为研究对象,比较不同森林类型和不同岩性对土壤植硅体和土壤植硅体碳含量的影响,探讨土壤植硅体碳在土壤剖面中的分布规律,估算不同森林土壤植硅体碳的总储量,为准确估算亚热带地区森林生态系统中的植硅体碳封存潜力提供基础数据。研究的主要结果如下:1.森林类型对土壤植硅体和植硅体中有机碳含量的影响研究表明:不同森林类型土壤植硅体含量的差异并不明显。不同森林类型土壤植硅体变化范围在11.28~14.58 g kg-1之间,其中以毛竹林土壤植硅体含量最高。土壤植硅体中有机碳含量变化范围在12.43~16.15 g kg-1之间。亚热带不同森林类型0~30cm土壤植硅体碳储量按如下次序递减:毛竹林(0.795 t hm-2)杉木林(0.572 t hm-2)阔叶林(0.488 t hm-2)≈针阔混交林(0.443 hm-2)。2.岩性对土壤植硅体和植硅体碳含量的影响研究表明:流纹岩发育土壤植硅体含量在15.54~19.62 g kg-1之间,砂页岩发育土壤在7.94~11.77 g kg-1之间,凝灰岩发育土壤在7.46~14.02 g kg-1之间。在毛竹林土壤中,流纹岩发育土壤植硅体含量(18.41g kg-1)显著高于凝灰岩的土壤植硅体,杉木林、阔叶林和针阔混交林中都是流纹岩的土壤植硅体含量高于其他两种岩性的土壤植硅体。在各个森林类型中,流纹岩的土壤植硅体碳含量都显著高于其他两种岩性土壤植硅体碳。3.土壤植硅体和植硅体碳含量在土壤剖面中的分布规律:不同森林类型的土壤植硅体和土壤植硅体碳含量在不同土层深度的变化不尽相同。总体而言,土壤植硅体和植硅体碳含量随着土层深度的增加而减少。PhytOC/TOC比率变化则为随着土层深度的增加而变大。
[Abstract]:Plant silicon is a solid amorphous particle which absorbs soluble silicon (H4SiO4) from soil by plant roots. Under the transpiration of plants, it precipitates in cells, cells or cell walls, and forms solid amorphous particles through the silicification of plants themselves. In the process of forming plant silicon, plants wrap a part of organic carbon, which is called Phytolith-occluded organic carbon,PhytOC. Surrounded by external weatherproof and corrosion-resistant silicon plants, the carbon can be stored in the soil stably for a long time, thus becoming one of the important mechanisms of long-term (ten thousand year scale) carbon sequestration in terrestrial soils. The subtropical forests in China are widely distributed and rich in vegetation types, and the parent materials of soil development are different. Phyllostachys pubescens forest, Cunninghamia lanceolata forest, broad-leaf forest and coniflower and broad-leaved mixed forest are the main forest types. It is of great significance to study the carbon sequestration potential of soil silicon in different forest types. In this study, different forest types of soils developed in different lithology (rhyolite, sand shale and tuff) were taken as the research objects to compare the effects of different forest types and lithology on the carbon content of soil phyllosilicon and soil phyllosilicon. The distribution of soil siliceous carbon in soil profile was discussed, and the total storage of vegetation silicon carbon in different forest soils was estimated, which provided basic data for accurate estimation of carbon sequestration potential in subtropical forest ecosystem. The main results of the study are as follows: 1. The effects of forest types on the content of organic carbon in soil silicon and soil silicon were studied. the results showed that there was no significant difference in soil silicon content among different forest types. The range of soil planting silicon in different forest types was 11.28 鈮，
本文编号：2477692
[Abstract]:Plant silicon is a solid amorphous particle which absorbs soluble silicon (H4SiO4) from soil by plant roots. Under the transpiration of plants, it precipitates in cells, cells or cell walls, and forms solid amorphous particles through the silicification of plants themselves. In the process of forming plant silicon, plants wrap a part of organic carbon, which is called Phytolith-occluded organic carbon,PhytOC. Surrounded by external weatherproof and corrosion-resistant silicon plants, the carbon can be stored in the soil stably for a long time, thus becoming one of the important mechanisms of long-term (ten thousand year scale) carbon sequestration in terrestrial soils. The subtropical forests in China are widely distributed and rich in vegetation types, and the parent materials of soil development are different. Phyllostachys pubescens forest, Cunninghamia lanceolata forest, broad-leaf forest and coniflower and broad-leaved mixed forest are the main forest types. It is of great significance to study the carbon sequestration potential of soil silicon in different forest types. In this study, different forest types of soils developed in different lithology (rhyolite, sand shale and tuff) were taken as the research objects to compare the effects of different forest types and lithology on the carbon content of soil phyllosilicon and soil phyllosilicon. The distribution of soil siliceous carbon in soil profile was discussed, and the total storage of vegetation silicon carbon in different forest soils was estimated, which provided basic data for accurate estimation of carbon sequestration potential in subtropical forest ecosystem. The main results of the study are as follows: 1. The effects of forest types on the content of organic carbon in soil silicon and soil silicon were studied. the results showed that there was no significant difference in soil silicon content among different forest types. The range of soil planting silicon in different forest types was 11.28 鈮，
本文编号：2477692
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