Lipid biogeochemistry of paddy soil evolution

分项目P7调查不同管理系统、不同作物和土壤演变的相应基质的土壤中脂类的分子和同位素组成。脂质化学分类学区分植物输入到土壤中，确定植物燃烧残留物（PAH），有助于土壤有机质，并确定在不同发育阶段的土壤中茁壮成长的微生物群落。由于水稻土的土壤地球化学取决于所有这些控制因素，脂质组成是高度互补的其他方法在这个项目中使用。在FOR 995第一期研究中，对慈溪沿海地区的潮土基质组成及其脂类地球化学特征进行了详细的研究。通过研究不同基质类型及其对土壤脂质的影响，将对这些结果进行扩展和验证，包括中国的Acrisol和印度尼西亚的Andosol，Vertisol和Acrisol/Ferralsol。在慈溪地区，海洋滩涂转化为水稻土后，在不到50年的时间内开始建立适应的微生物群落，此后在长达2000年的时间里保持相当稳定。加速适应水稻管理假设在印度尼西亚的热带环境，在那里的时间序列与110，45和3年的水稻使用将被用来验证假设的快速变化的土壤脂质。印度尼西亚的管理做法预计会使稻田缺氧时间更长，影响微生物活动和土壤有机质的保存。将综合中国慈溪和红壤地区以及爪哇和苏门答腊的水稻土脂质地球化学的环境差异，以获得东南亚水稻土演变的总体观点。

Subproject P7 investigates the molecular and isotopic composition of lipids in soils of different management systems, of different crop plants and of the corresponding substrates on which the soils evolved. Lipids chemotaxonomically differentiate the plant input into soil, identify plant combustion residues (PAH) that contribute to soil organic matter, and identify the microbial communities that thrive in soils of variable developmental stage. As the biogeochemistry of paddy soils depends on all of these control factors, lipid compositions are highly complementary to other approaches utilized in this project. The Fluvisol substrate composition in the coastal Cixi area and its lipid biogeochemistry has been characterized in detail in the first phase of FOR995. Extension and validation of these results via the study of different substrate types and associated effect on soil lipids will be conducted on Acrisols from China and Andosols, Vertisols and Acrisols/Ferralsols from Indonesia. Establishment of adapted microbial communities after conversion of marine tidal flats to paddy soils commenced in less than 50 years and thereafter remained rather stable for up to 2000 years in the Cixi area. An accelerated adaption to paddy management is hypothesized for the tropical environment in Indonesia, where a chronosequence with 110, 45 and 3 years of paddy use will be used to verify the postulated rapid changes in soil lipids. The management practices in Indonesia are expected to enforce longer periods of anoxia in paddies, affecting microbial activity and soil organic matter preservation. Environmental differences in paddy soil lipid geochemistry for the Cixi and Red Earth area in China, as well as for Java and Sumatera will be synthesized to obtain a general perspective of paddy soil evolution in Southeast Asia.