华北落叶松(Larix principis—rupprechtii Mayr)扦插繁殖多用木质化嫩枝作插条。但插条离体扦插,易失水萎蔫致死。欲使插条成活,保持高的温度环境固然很重要,然而插条离体,营养来源切断,再加之采取遮荫措施,光合作用受限,插条体内营养入不敷 Larix principis-rupprechtii Mayr cuttings multiply lignified shoots for cutting. However, cuttings in vitro cuttings, wilting water wilting death. To make cuttings survive, maintaining high temperature environment is of course important, however, cuttings, cut off from the source of nutrients, coupled with shading measures taken to limit photosynthesis, cuttings nutrition in the body inadequate