长期定位施锌土壤-作物系统锌分布特征研究  

Distribution of zinc in soil-crop system after long-term located application of zinc fertilizer.

作　　者：魏孝荣[1] 郝明德[1] 田梅霞[1] 

机构地区：[1]水利部中国科学院水土保持研究所,杨陵712100

出　　处：《中国生态农业学报》2005年第2期96-98,共3页Chinese Journal of Eco-Agriculture

基　　金：国家自然科学基金项目 (4 0 1710 5 8);中国科学院知识创新工程方向性项目 (KZCX2 413 3 );国家科技攻关项目 (2 0 0 1BA5 0 8B18)资助

摘　　要：长期定位试验研究施Zn土壤作物系统Zn分布特征结果表明,长期施用Zn肥可引起Zn在土壤中的累积,其剖面各土层有效锌含量均高于对照,且高于Zn肥有效施用的临界值。冬小麦各器官及全株Zn浓度和积累量均高于对照,但分配有所不同。长期施用Zn肥土壤中Zn有较大盈余,作物携出量仅占当季施Zn量的4 11% ,长期施用Zn肥作物体内Zn含量虽未超标,但却引起Zn在土壤中的富集。A long term located experime nt of application of zinc fertilizer is conducted to study the distribution of Zn in soil crop system. Th e results show that zinc can be accumulated in soil after long ter m continuous application o f zinc fertilizer, the available zinc concentration in soil is enhanced, which i s higher than the critical value for assess whether Zn deficiency is occured or not .H igh zinc concentrations in crops and different tissues are observed owing to con tinuous application of zinc, but their distributions are different. Zinc is accu mulated in soil after a long term continuous application of zinc and zinc amount carried out by the crop is only 4.11% of the applied amount. So, it makes a potential risk for soil ecosystem.

关 键 词：N肥 土壤生态环境 长期施用 长期定位 作物系统 有效锌 冬小麦 分布特征 潜在危害 富集 

分 类 号：S154.3[农业科学—土壤学] S512[农业科学—农业基础科学]