土壤施钾对冬枣幼苗生长、养分含量和光合特性的影响

摘要

In order to learn the responses of Zizyphus jujuba to applying potassium in slightly salted soil and provide a theoretical basis for rational potassium fertilization, the effects of potassium applied into soil on biological yield, nutrient contents and leaf photosynthetic characteristics in Z. jujuba were studied by a pot experiment. The results show that the appropriate application of KCl can signiifcantly enhance the biological yield in Z. jujube, as well as the contents of N, P, and K are increased, so nutrient status of tree is improved. However, excessive application can inhibit growth in Z. jujuba. Reasonable application of exogenous K+can increase K+/Na+in leaf, alleviate ion imbalance caused by salt stress to some extent, enhance photosynthetic characteristics, and improve physiological function of leaf.%为了了解冬枣在土壤轻度盐胁迫下对外源钾的响应，采用盆栽试验方法，探讨了土壤施钾对冬枣幼苗生物产量、养分含量以及叶片光合特性的影响，以期对冬枣合理施用钾肥提供理论依据。结果表明，施用适量KCl可以显著提高冬枣的生物产量，同时增加叶片中的N、P、K含量，改善树体营养状况，但过量施钾会抑制冬枣生长。适量施用外源K+可提高叶片中的K+/Na+，在一定程度上减轻盐胁迫造成的离子失衡，增强叶片的光合性能，改善叶片的生理功能。