• ISSN 1008-505X
  • CN 11-3996/S
刘荣乐, 金继运, 吴荣贵, 梁鸣早. 我国北方土壤作物系统内钾素循环特征及秸秆还田与施钾肥的影响[J]. 植物营养与肥料学报, 2000, 6(2): 123-132. DOI: 10.11674/zwyf.2000.0201
引用本文: 刘荣乐, 金继运, 吴荣贵, 梁鸣早. 我国北方土壤作物系统内钾素循环特征及秸秆还田与施钾肥的影响[J]. 植物营养与肥料学报, 2000, 6(2): 123-132. DOI: 10.11674/zwyf.2000.0201
LIU Rong-le, JIN Ji-yun, WU Rong-gui, LIANG Ming-zao. Study on the characteristics of potassium cycling in different soil-crop systems in northern China[J]. Journal of Plant Nutrition and Fertilizers, 2000, 6(2): 123-132. DOI: 10.11674/zwyf.2000.0201
Citation: LIU Rong-le, JIN Ji-yun, WU Rong-gui, LIANG Ming-zao. Study on the characteristics of potassium cycling in different soil-crop systems in northern China[J]. Journal of Plant Nutrition and Fertilizers, 2000, 6(2): 123-132. DOI: 10.11674/zwyf.2000.0201

我国北方土壤作物系统内钾素循环特征及秸秆还田与施钾肥的影响

Study on the characteristics of potassium cycling in different soil-crop systems in northern China

  • 摘要: 在我国北方 13个省 (市、自治区 )的 25个点上 ,进行了 5年的钾肥定位试验。结果表明 ,我国北方土壤全钾含量地区性差异不大 ,而土壤缓效钾和土壤速效钾含量 ,西北地区土壤远高于东北和华北地区土壤 ,华北地区土壤的土壤缓效钾含量又远高于东北地区土壤 ,而土壤速效钾含量却低于东北地区土壤。在主要种植制下的代表性土壤上 ,东北、西北和华北地区不同种植制度下的作物吸钾量也存在明显差异。西北地区的作物吸钾量一般较高 ,华北地区一年两熟制的作物年吸钾量远大于东北地区的一年一熟制。秸秆还田和施钾肥对作物吸钾量有提高作用。在不施钾肥的情况下 ,土壤钾库长期处在被作物耗用的状态下 ,土壤速效钾含量逐渐下降 ,土壤缓效钾含量也有下降的趋势。施钾肥和秸秆还田配施钾肥 ,均能不同程度地减缓这种下降趋势

     

    Abstract: As the potassium contents in soils of northern China are relatively high, it is of significance to strengthen the potassium cycling in the agricultural production systems and apply potash fertilizer rationally based on the potassium cycling characteristics in soil-plant systems and the soil potassium balance under different cropping system. Soil analysis revealed that the soil total K contents in northern China soil showed small variation but the soil readily available K and slowly available K contents were significantly higher in soils of northwestern China. The soil readily available K contents were much higher in soils of northeastern China than in north?central China, and for the soil slowly available K contents the reverse was true. The fixed site field trials on the representative soils under the main cropping systems in northern 12 provinces revealed that crop K uptakes under various cropping systems varied significantly. The crop K uptakes in northwestern China were general higher and the double cropping under north-central China showed much higher annual crop K uptakes than the single crop in northeastern China. Returning the wheat straw back into the soil and applying potash fertilizer improved the crop K uptake, with the applying potash fertilizer combined to wheat straw returning showing most prominent effect. The soils were under the depleting status of K when no potash fertilizer was used, the soil readily available K content declined gradually. Potash application and its combination to straw returning would reduce the soil K depletion by crop uptake and slow down the decline of soil K content to some extent.

     

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