亞熱帶重要森林類型土壤植硅體碳的研究
發(fā)布時間：2019-05-15 18:04
【摘要】：植硅體是植物根部吸收土壤中可溶性的硅(H4SiO4),在植物的蒸騰作用下,沉淀在細胞、細胞間或細胞壁中,通過植物自身硅化作用而形成的固體非晶質(zhì)顆粒。植物在形成植硅體的過程中,會將一部分有機碳包裹進去,這部分封存的有機碳就稱之為植硅體碳(Phytolith-occluded organic carbon,PhytOC)。植硅體碳受外部抗風化、耐腐蝕的植硅體的包圍,可以長期穩(wěn)定地封存在土壤中,從而成為陸地土壤長期(萬年尺度)固碳的重要機制之一。中國亞熱帶森林分布廣闊,植被類型豐富,土壤發(fā)育的母質(zhì)各不相同。毛竹林、杉木林、闊葉林和針闊混交林是其主要的森林類型,研究不同森林類型土壤植硅體碳及其固碳潛力具有重要意義。本研究以發(fā)育于不同巖性(流紋巖、砂頁巖和凝灰?guī)r)的不同森林類型土壤為研究對象,比較不同森林類型和不同巖性對土壤植硅體和土壤植硅體碳含量的影響,探討土壤植硅體碳在土壤剖面中的分布規(guī)律,估算不同森林土壤植硅體碳的總儲量,為準確估算亞熱帶地區(qū)森林生態(tài)系統(tǒng)中的植硅體碳封存潛力提供基礎(chǔ)數(shù)據(jù)。研究的主要結(jié)果如下:1.森林類型對土壤植硅體和植硅體中有機碳含量的影響研究表明:不同森林類型土壤植硅體含量的差異并不明顯。不同森林類型土壤植硅體變化范圍在11.28~14.58 g kg-1之間,其中以毛竹林土壤植硅體含量最高。土壤植硅體中有機碳含量變化范圍在12.43~16.15 g kg-1之間。亞熱帶不同森林類型0~30cm土壤植硅體碳儲量按如下次序遞減:毛竹林(0.795 t hm-2)杉木林(0.572 t hm-2)闊葉林(0.488 t hm-2)≈針闊混交林(0.443 hm-2)。2.巖性對土壤植硅體和植硅體碳含量的影響研究表明:流紋巖發(fā)育土壤植硅體含量在15.54~19.62 g kg-1之間,砂頁巖發(fā)育土壤在7.94~11.77 g kg-1之間,凝灰?guī)r發(fā)育土壤在7.46~14.02 g kg-1之間。在毛竹林土壤中,流紋巖發(fā)育土壤植硅體含量(18.41g kg-1)顯著高于凝灰?guī)r的土壤植硅體,杉木林、闊葉林和針闊混交林中都是流紋巖的土壤植硅體含量高于其他兩種巖性的土壤植硅體。在各個森林類型中,流紋巖的土壤植硅體碳含量都顯著高于其他兩種巖性土壤植硅體碳。3.土壤植硅體和植硅體碳含量在土壤剖面中的分布規(guī)律:不同森林類型的土壤植硅體和土壤植硅體碳含量在不同土層深度的變化不盡相同�？傮w而言,土壤植硅體和植硅體碳含量隨著土層深度的增加而減少。PhytOC/TOC比率變化則為隨著土層深度的增加而變大。
[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，
本文編號：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，
本文編號：2477692
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