Role of freeze-thaw cycles and chlorpyrifos insecticide use on diffuse Cd loss and sediment accumulation.
Role of freeze-thaw cycles and chlorpyrifos insecticide use on diffuse Cd loss and sediment accumulation.
复制标题
冻融循环和毒死蜱杀虫剂的使用对镉扩散损失和沉积物积累的作用
DOI：
10.1038/srep27302
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发表时间：
2016-06-02
影响因子：
4.6
通讯作者：
Lin C
中科院分区：
文献类型：
--
作者：
Wang F;Ouyang W;Hao F;Jiao W;Shan Y;Lin C
在寒冷的温带地区，冻融循环预计会增加。冻融循环和农用化学品的相互作用对镉释放到河水中的潜在影响是未知的。研究了冻融循环和毒死蜱对土壤镉迁移的影响。在冻融农业系统中，长期的集约耕作土壤镉的空间变异也被确定。通过对沉积物地球化学特征的分析，揭示了沉积物中Cd含量的时间变化规律。结果表明，FC提高了土壤Cd的迁移率，CaCl 2提取态Cd增加了约10%。土壤中水溶态和交换态Cd的移动的态含量的增加主要是由于铁锰氧化物结合态和有机质结合态Cd含量的减少。表层土壤全Cd含量呈现旱地>水田>自然地的地带性降低趋势。1943 - 2013年，由于农业开发和农田灌溉系统建设，沉积物柱样中Cd浓度和沉积速率普遍增加，表明Cd输入水体的通量增加。研究结果为揭示寒冷地区农田土壤Cd迁移对气候和人为因素的响应提供了有价值的信息。
Freeze-thaw cycles are predicted to increase in cold temperate regions. The potential influence of the interactions of freeze-thaw cycles and agrochemicals on the release of Cd into river water is unknown. In this study, the interactions of freeze-thaw cycles and chlorpyrifos (FC) on Cd mobility in soils were analysed. The spatial variability of soil Cd under long-term intensive tillage in a freeze-thaw agro-system was also identified. The temporal variation of sediment Cd was detected based on analysis of the sediment geochemistry. The results showed that FC increased soil Cd mobility, with an increase of approximately 10% in CaCl2-extractable Cd. The increased mobile fractions of water-soluble and exchangeable Cd originated from the decreased fraction of Fe-Mn-oxide-associated Cd and organic matter-bound Cd. The total Cd content in the surface soil followed the zonally decreasing trend of dry land > paddy land > natural land. The Cd concentrations and sedimentation rates of the sediment core generally increased from 1943 to 2013 due to agricultural exploration and farmland irrigation system construction, indicating an increase of the Cd input flux into water. The results provide valuable information about the soil Cd transport response to the influence of climatic and anthropogenic factors in cold intensive agro-systems.