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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Chemotaxonomy and diagenesis of aliphatic hydrocarbons in rice plants and soils from land reclamation areas in the Zhejiang Province, China
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Chemotaxonomy and diagenesis of aliphatic hydrocarbons in rice plants and soils from land reclamation areas in the Zhejiang Province, China

机译：浙江省土地开垦区水稻植物和土壤中脂肪烃的化学分类和成岩作用

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Rice is the most important staple food globally and requires large growth areas kept under flooded paddy conditions, contributing significantly to microbial greenhouse gas emissions. Biogeochemical cycling in such agroecosystems has been investigated intensively but molecular biomarker studies are scarce. We conducted a chemotaxonomic investigation of wax alkanes differentiated for plant tissue (leaf, stem, root) of rice and intercrop plants (maize, sorghum, rape, mustard, bean, cotton) and studied the incorporation of these lipids into soil under paddy compared with upland management forms. Soil chronosequences reflecting paddy and upland agroecosystem changes compared with natural soil substrates over the past two millennia were studied in land reclamation areas of Zhejiang Province, China. Soils evolved on tidal wetland sediments contained predominantly lipids derived from terrigenous supply by the Yangtze River (YR = Chang Jiang) and to a lesser extent from marine sources via the East China Sea (ECS). Agricultural usage converted lipid composition of topsoil within 50 yr to reflect the n-alkane patterns of crops with their relative proportion increasing with cultivation time. Alkyl chain length distribution of rice was broad compared with upland plants, due to the water regime changing over the growth period. This separated paddy from upland managed soils on the basis of alkyl lipids, allowing reconstruction of past land use change. Combustion of crop biomass after harvest is common practice and generates alkenes upon incomplete combustion which, due to their high reactivity, are immediately converted to alkanes with lower carbon preference index (CPI) in topsoil. The storage of lipids and organic matter over time is greater in paddy than in upland managed agroecosystems and contributes to CO2 sequestration from the atmosphere. (C) 2015 Elsevier Ltd. All rights reserved.
机译：稻米是全球最重要的主食，需要在稻田淹没的情况下保持较大的种植面积，从而大大增加了微生物温室气体的排放。已经对这种农业生态系统中的生物地球化学循环进行了深入研究，但分子生物标记研究却很少。我们对在水稻和间作植物（玉米，高粱，油菜，芥菜，豆，棉花）的植物组织（叶，茎，根）中分化出的蜡烷进行了化学分类学研究，并研究了将这些脂质掺入水稻下的土壤中的情况。山地管理形式。在中国浙江省的土地开垦区，研究了过去两千年来反映稻谷和旱地农业生态系统与天然土壤基质相比变化的土壤时序。在潮汐湿地沉积物上演化的土壤主要含有来自长江源水的脂质（YR =长江），而较少部分来自经由东海（ECS）的海洋资源。农业使用在50年内转换了表土的脂质组成，以反映农作物的正构烷烃模式，其相对比例随耕种时间的增加而增加。与陆地植物相比，水稻的烷基链长分布较宽，这是由于生育期的水分变化所致。这种稻谷是根据烷基脂质从旱地土壤中分离出来的，从而可以重建过去的土地利用方式。收获后作物生物量的燃烧是常见的做法，燃烧不完全会生成烯烃，由于它们的高反应性，它们会立即转化为表土中碳优先指数（CPI）较低的烷烃。稻田中脂质和有机物随时间的存储量比旱地管理的农业生态系统中的存储量大，并有助于从大气中隔离二氧化碳。 （C）2015 Elsevier Ltd.保留所有权利。

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