Change of PAHs with evolution of paddy soils from prehistoric to present over the last six millennia in the Yangtze River Delta region, China.
Change of PAHs with evolution of paddy soils from prehistoric to present over the last six millennia in the Yangtze River Delta region, China.
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DOI：
10.1016/j.scitotenv.2013.01.084
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
Jin Zhang;Mueller-Niggemann Cornelia;Minyan Wang;Z. Cao;Xiping Luo;Minghung Wong;Wei Chen-
中科院分区：
文献类型：
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作者：
Jin Zhang;Mueller-Niggemann Cornelia;Minyan Wang;Z. Cao;Xiping Luo;Minghung Wong;Wei Chen-
为评价近6000年来水稻土演变过程中水培管理对土壤有机组分的影响，以多环芳烃（PAHs）为生物标志物，结合总有机碳含量，研究了2个完全埋藏的古水稻土剖面的有机碳变化。结果表明，水耕管理可引起稻田有机碳沉积。埋藏古稻田土壤中总PAH含量的变化与总有机碳含量的变化并不总是一致的。6280 BP史前水稻土层中多环芳烃含量为3环>5环>4环>6环，而现代水稻土和史前高地中多环芳烃含量为3环>4环>5环>6环。两个剖面中菲对多环芳烃总量的贡献，以及从母质/6280 BP史前高地到6280 BP稻田，菲占烷基化多环芳烃的比例逐渐增加，表明水耕管理对稻田土壤的人为影响显著增加。根据14 C年龄和生物特征，推测这两个剖面中的多环芳烃只可能来自于新石器时代以来水稻土的水耕管理。Cadalene可作为水稻秸秆释放多环芳烃生物源的指示剂，苯并[g，h，i]荧蒽和苯并[g，h，i] 苝可作为农田植被火灾释放多环芳烃的热源指示剂。
To evaluate the influence of hydroponics management on soil organic components with evolution of paddy soil over the last six millennia, PAHs, as a biomarker, as well as total organic carbon content were used to explore changes of paddy soil organic carbon in two entirely buried ancient paddy soil profiles. The results showed that hydroponics management can cause organic carbon deposition in rice paddy. The changing of total PAH concentrations was not always in accordance with the changing of total organic carbon contents in layers of the buried ancient paddy soils. The PAHs in 6280BP prehistoric paddy soil layer was 3-ring>5-ring>4-ring>6-ring, while in layers of the present paddy soil and the prehistoric upland were 3-ring>4-ring>5-ring>6-ring. The contribution of phenanthrene to total PAHs in two profiles and the increasing ratio of phenanthrene to alkylated PAHs from parent material/6280BP prehistoric upland to 6280BP paddy suggested substantial increase of the anthropogenic influence of hydroponics management on rice paddy soil. And in view of the14C age and bioremains in the two profiles, it was only possible for PAHs to be derived from hydroponics management with evolution of the paddy soils form the Neolithic age. Cadalene could be used as an indicator for biological sources of PAHs released by rice plant residues, and benzo[g,h,i]fluoranthene and benzo[g,h,i]perylene for pyrogenic sources released by field vegetation fires.