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生态学杂志 ›› 2023, Vol. 42 ›› Issue (10): 2359-2367.doi: 10.13292/j.1000-4890.202310.028

• 湿地生态与修复专栏 • 上一篇    下一篇

黄河三角洲农田退耕年限对土壤不同形态氧化铁含量及其分布的影响

孙丹丹1,刘学1,杨继松1,2*,于君宝1,王志康1,周迪1,栗云召1,于洋1,宁凯2
  

  1. 1鲁东大学滨海生态高等研究院, 资源与环境工程学院, 山东烟台 264025; 2东营市农业科学研究院, 山东东营 257091)

  • 出版日期:2023-10-10 发布日期:2023-10-07

Effects of returning years from farmland to wetland on the content and distribution of soil iron oxides in the Yellow River Delta.

SUN Dandan1, LIU Xue1, YANG Jisong1,2*, YU Junbao1, WANG Zhikang1, ZHOU Di1, LI Yunzhao1, YU Yang1, NING Kai2#br#

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  1. (1The Institute for Advanced Study of Coastal Ecology, School of Resources and Environmental Engineering, Ludong University, Yantai 264025, Shandong, China; 2Dongying Academy of Agricultural Sciences, Dongying 257091, Shandong, China).

  • Online:2023-10-10 Published:2023-10-07

摘要: 土壤中铁元素主要以氧化物形态存在,土地利用方式的变化会导致其形态发生转变。本研究选取黄河三角洲不同退耕年限土地为对象,通过分析退耕土壤理化性质和不同形态氧化铁含量,探讨退耕年限对土壤氧化铁含量及其形态变化的影响。结果表明:总体上农田退耕后土壤(0~40 cm)含水量、有机质、总氮和总磷含量以及表层土壤黏粒含量随退耕年限的延长呈上升趋势;土壤pH和土壤容重的变化则不明显。土壤全铁(FeT:23.68~26.60 g·kg-1)含量在退耕的前6年内无显著变化,但退耕6年后则随退耕年限的增加而降低;游离态氧化铁(Fed:4.97~5.81 g·kg-1)与FeT变化趋势大致相同;络合态氧化铁(Fep:0.03~0.21 g·kg-1)和无定形态氧化铁(Feo:0.54~0.76 g·kg-1)变化趋势基本一致,均表现为随退耕年限呈先降低后上升的变化趋势。退耕还湿后土壤中全铁和各形态氧化铁含量与土壤理化性质呈现出不同程度的相关性。研究表明,黄河三角洲农田退耕还湿将对土壤理化性质与氧化态铁的含量及其分布产生明显影响。


关键词: 退耕还湿, 湿地土壤, 氧化铁, 土壤理化性质, 黄河三角洲

Abstract: The main forms of iron in soil are oxides, the transformations of which are affected by land use change. We collected soil samples at 0-40 cm layers of four land types from returning farmland to wetland with different restoration years (3, 6, 11, and 16 years) as well as a farmland and a natural wetland in the Yellow River Delta. We analyzed soil physical and chemical properties and the contents of iron oxides in different forms, and explored the effects of restoration years on the variation of the contents of iron oxides in different forms. The results showed that the contents of soil water, organic matter, total nitrogen, and total phosphorus at 0-40 cm layers and clay content at 0-10 cm layer increased with increasing restoration years, and that there were no significant changes in soil pH and bulk density. The contents of total iron (FeT) ranged from 23.68 to 26.60 g·kg-1, showing no significant change in the lands returned from farmland to wetland in the initial six years and a decrease after six years. The contents of free iron oxide (Fed) ranged from 4.97 to 5.81 g·kg-1, which were similar to the change of FeT contents. The contents of complex iron oxide (Fep) and amorphous iron oxide (Feo) ranged from 0.03 to 0.21 g·kg-1 and from 0.54 to 0.76 g·kg-1, respectively. Both Fep and Feo showed a trend of decreasing first and then increa-sing with increasing restoration years. The contents of FeT and various iron oxides were correlated with soil physicochemical properties in varying degrees. Our results indicate that returning farmland to wetland could significantly affect soil physicochemical properties and the contents and distribution of iron oxides in the Yellow River Delta.


Key words: returning farmland to wetland, wetland soil, iron oxide, soil physicochemical property, Yellow River Delta.