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对闽江河口原生植被芦苇沼泽,以及由其转化的不同其它土地利用类型(滩涂养殖地、水田、草地、撂荒地和池塘养殖地)的表层(0-50 cm)沉积物(或土壤)有机碳和活性有机碳含量的研究,结果表明,滩涂养殖地、水田、池塘养殖地、草地和撂荒地的土壤有机碳含量分别比芦苇沼泽地低27%,75%,67%,1%,60%;在有机碳储量方面,滩涂养殖地、水田、池塘养殖地和撂荒地比天然芦苇沼泽地分别低11%,50%,37%,24%,草地有机碳储量比芦苇高44%;草地土壤有机碳含量和储量随土层加深而递减的幅度比芦苇地大;水田有机碳含量和储量垂直变化不明显,弃耕后,表层有机碳含量提高,垂直变化明显。不同土地利用方式间土壤活性有机碳含量的差异比有机碳的差异大,与芦苇地相比,滩涂养殖地、水田、池塘、草地活性有机碳含量分别低24%,83%,84%,42%;撂荒10年的弃耕地与水稻田土壤相比,活性有机碳含量提高了47%。
Phytoplankton (or soil) organic matter from the reed marshes of the native vegetation in the Minjiang Estuary and the topsoil (0-50 cm) from the various other land-use types (tidal flats, paddy fields, meadows, wastelands and pond farms) The results showed that soil organic carbon content in tidal flat, paddy field, pond farmland, grassland and abandoned land were 27%, 75%, 67%, 1%, 60% lower than that in reed marshes respectively %; Organic carbon storage areas, tidal flats, paddy fields, ponds and fallow fields were 11%, 50%, 37% and 24% lower than natural reed marshes, respectively. Grassland organic carbon storage was 44% Soil organic carbon content and soil organic matter decreased with soil depth larger than that of reed soil. Organic carbon and paddy soil had no obvious change in vertical. After abandonment, soil organic carbon content increased significantly and vertical variation was obvious. Compared with Phragmites australis, the content of soil active organic carbon in different land use patterns was significantly lower than that in organic matter, and the content of active organic carbon in tidal flat, paddy field, pond and grassland was 24%, 83%, 84%, 42% %. Compared with paddy soils, the abandoned cropland abandoned for 10 years had an increase of 47% in active organic carbon.