Jardé Emilie, Gruau Gérard, Jaffrezic Anne
CNRS UMR 6118 Geosciences Rennes, Campus de Beaulieu, 35042 Rennes Cedex, France.
J Agric Food Chem. 2009 Aug 12;57(15):6950-6. doi: 10.1021/jf901238g.
Soluble organic fractions from soils of two agricultural sites from Brittany (France) have been analyzed to (i) identify the source of polar compounds in soils and (ii) evaluate the impact of organic fertilization and crop type on the distribution and concentration of polar compounds in soils. The main sources of polar compounds in soils are higher plants; they represent >70% of the polar compounds from the experimental sites and mainly originate from crop residues and animal manure. Crop type and animal manure application significantly increase the polar compound concentrations in soils. Among polar compounds, fatty acids cannot be used as specific markers because their distributions in soils whatever the crop type or organic fertilization type are the same. On the other hand, analysis of steroids provides interesting information. Cow and poultry manure applications increase only the concentration of steroids. Pig slurry fertilization modifies both the concentration and distribution of steroids. The identified pig slurry steroid fingerprint can persist in the soil for 9 years after the slurry application has been stopped. Those compounds are then robust markers to detect pig slurry contribution in soils.
对来自法国布列塔尼两个农业地点土壤中的可溶性有机组分进行了分析，目的是：（i）确定土壤中极性化合物的来源；（ii）评估有机施肥和作物类型对土壤中极性化合物分布和浓度的影响。土壤中极性化合物的主要来源是高等植物；它们占实验地点极性化合物的70%以上，主要来源于作物残茬和动物粪便。作物类型和动物粪便的施用显著增加了土壤中极性化合物的浓度。在极性化合物中，脂肪酸不能用作特定标志物，因为无论作物类型或有机施肥类型如何，它们在土壤中的分布都是相同的。另一方面，类固醇分析提供了有趣的信息。施用牛粪和家禽粪便仅增加了类固醇的浓度。猪粪施肥改变了类固醇的浓度和分布。所确定的猪粪类固醇指纹在停止施用猪粪后可在土壤中持续9年。这些化合物是检测土壤中猪粪贡献的有力标志物。
