Aging activity of DDE in dissimilar rice soils in a greenhouse experiment.
Aging activity of DDE in dissimilar rice soils in a greenhouse experiment.
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DOI：
10.1016/j.chemosphere.2007.09.059
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发表时间：
2008-04
期刊：
影响因子：
8.8
通讯作者：
F. Yao;Gui-fen Yu;F. Wang;Xing-lun Yang;Xin Jiang
中科院分区：
文献类型：
--
作者：
F. Yao;Gui-fen Yu;F. Wang;Xing-lun Yang;Xin Jiang
根据世界参考基地(WRB)[FAO/ISRIC/ISSS]，2005年底进行了一项温室研究，以调查p，p‘-DDE在两种类型的土壤--人为土壤(An)和土壤水培土壤(Ac)--中的老化行为。1998年。世界土壤资源参考基地。《世界土壤资源报告》，罗马。第87页]。水稻和旱稻分别种植在淹水水稻土和非淹水旱地土壤中。新鲜土壤中可浸提态p，p‘-DDE的浓度为746.2ngg−1。在试验的前几周，随着老化时间的延长，p，p’-DDE的可浸提性逐渐降低。然而，土壤矿物和有机质(OM)捕获的一定数量的p，p‘-DDE可以在后期被释放并成为可提取的。淹水土壤中p，p‘-DDE的萃取率显著低于非淹水土壤，这是因为淹水会增加污染物与土壤颗粒的结合。种植旱稻和水稻均能延缓p，p‘-DDE的老化进程。水稻生长一个月后，与土壤颗粒结合的p，p‘-DDE被释放出来，成为可提取的。硝酸铵的有机质和泥沙含量均高于醋酸铵，从而导致氮中p，p‘-DDE的结合态残留量较多，萃取率相对较低。此外，稻草还能降低土壤中p，p‘-DDE的可萃取性。
A green-house study was conducted in late 2005 to investigate the aging behavior of p,p′-DDE in two types of soil, Hydragric Anthrosols (An) and Hydragric Acrisols (Ac), according to the World Reference Base (WRB) [FAO/ISRIC/ISSS. 1998. World reference base for soil resources. World soil resources reports, Rome. p. 87]. Paddy rice and dry rice were grown in submerged paddy soils and non-submerged upland soils, respectively. The concentration of extractable p,p′-DDE in fresh DDE-spiked soils was 746.2ngg−1. During the first few weeks of the experiment, the extractability of p,p′-DDE became increasingly low as the aging period prolonged. However, certain amount of p,p′-DDE that had been captured by soil minerals and organic matter (OM) could be released and became extractable in the later period. The extractability of p,p′-DDE in submerged soils was significantly lower than that in non-submerged soil, because flooding could increase the binding of pollutants to soil particles. The plantation of both dry rice and paddy rice slowed down the aging process of p,p′-DDE. After one month’s growth of rice, p,p′-DDE bound to soil particles was released and became extractable. The OM and silt content of An are higher than that of Ac, resulting in more bound residues and relative lower extractability of p,p′-DDE in An. In addition, the extractability of p,p′-DDE could be reduced by the addition of rice straw to soils.