| 不同退耕年限下菜子湖湿地土壤活性铝形态特征 |
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| 引用本文： | 王娅娅,杨艳芳,李云飞,刘文静,张平究.不同退耕年限下菜子湖湿地土壤活性铝形态特征[J].长江流域资源与环境,2016,25(2):307-315. |
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| 作者姓名： | 王娅娅 杨艳芳 李云飞 刘文静 张平究 |
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| 作者单位： | 1. 安徽师范大学国土资源与旅游学院/安徽自然灾害过程与防控研究省级重点实验室, 安徽 芜湖 241003;2. 安徽师范大学环境科学与工程学院, 安徽 芜湖 241003 |
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| 基金项目： | 国家自然科学基金项目(41001369，41301249)the National Natural Science Foundation of China(Grant No.41001369 and 41301249)，安徽省自然科学基金项目(1308085MD22)the Natural Science Foundation of Anhui Province(1308085MD22) |
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| 摘 要： | 选取菜子湖区不同退耕年限(3、5、7、9、11和21 a)湿地、以仍耕油菜地和原始湿地土壤为研究对照,分析了土壤全铝和活性铝形态组分特征,探讨退耕还湖后湿地土壤铝元素组分特征变化及其生态效应。结果表明,研究区土壤全铝含量和活性铝含量分别在16.78~57.05 g/kg和1 699.94~3 823.49 mg/kg之间,其中活性铝总量占全铝含量的6.70%~11.84%。退耕还湖3~11a期间,土壤全铝、活性铝总量及5种形态活性铝总体均随退耕年限延长而增加;退耕11~21 a期间均下降。不同形态活性铝中,可溶性铝Al S含量最低,而酸溶无机铝和腐殖酸铝Al-HA含量较高,分别占活性铝总量的42%~53%和39%~50%,左右着活性铝总量的变化。分析讨论表明退耕后湿地植被和水文条件的改变导致土壤粘粒,有效磷和有机质的变化,进而影响退耕后土壤活性铝组分特征。其中0~5 cm土壤毒性较强的交换性铝Al3+和羟基铝Al(OH)2+、含量均在退耕3~9 a期间逐渐增加,占活性铝总量的比例也有所增加,该退耕期湿地土壤存在一定的铝毒生态风险。
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| 关 键 词： | 退耕还湖 湿地土壤 活性铝形态 铝毒 |
CHANGES OF ACTIVE ALUMINUM FORMS IN WETLANDS WITH VARIOUS RESTORATION AGES IN CAIZI LAKE,ANHUI PROVINCE |
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| WANG Ya-ya,YANG Yan-fang,LI Yun-fei,LIU Wen-jing,ZHANG Ping-jiu.CHANGES OF ACTIVE ALUMINUM FORMS IN WETLANDS WITH VARIOUS RESTORATION AGES IN CAIZI LAKE,ANHUI PROVINCE[J].Resources and Environment in the Yangtza Basin,2016,25(2):307-315. |
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| Authors: | WANG Ya-ya YANG Yan-fang LI Yun-fei LIU Wen-jing ZHANG Ping-jiu |
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| Institution: | 1. Anhui Key Laboratory of Natural Disasters Process and Prevention/College of Territorial Resource and Tourism, Anhui Normal University, Wuhu 241003, China;2. College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241003, China |
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| Abstract: | Soils were sampled in rape field, native wetland, and wetland returned from farmland to lake (RFL) within different periods (3, 5, 7, 9, 11 and 21a) and analyzed the distribution of active aluminum forms in the Caizi Lake, Anhui Province. The results showed that the contents of soil total aluminum (AlT) and active aluminum (AlA) were 16.78-57.05 g/kg and 1 699.94-3 823.49 mg/kg respectively, moreover AlA accounted for 6.70%-11.84% of soil AlT in studied fields. The contents of AlT, AlA and other five active aluminum forms increased with the increase of RFL age within the restoration period of 3-11a, and declined gradually after 11a of RFL. Among the active aluminum forms, solution aluminum (AlS) was the lowest. Acid-soluble inorganic aluminum Al(OH)30] and humic-acid aluminum Al-HA] were higher, which accounted for 42%-53% and 39%-50% of soil AlA respectively, which dominated the change of AlA. The results indicated that the variation of soil clay, organic matter and available phosphorus was due to the change of wetland vegetation and hydrological conditions, which resulted in the characteristics of soil active aluminum components after RFL. The results also indicated that the most toxic forms of aluminum, exchange aluminum (Al3+) and unimer hydroxyl aluminum Al(OH)2+、Al(OH)2+] increased gradually within the restoration period of 3-9 a. Wetland soils sustained ecological risk of aluminum toxicity in the period of 3-9 a after RFL. |
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| Keywords: | returning farmland to lake wetland soil forms of active aluminum aluminum toxicity |
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