小麦越冬前阶段发育与热效应、形态建成的关系

The Relationship between Wheat Growth Stages and Thermal Effect or Morphogenesis before Overwintering

本研究应用小麦越冬前生长阶段发育估测算法（Haunstages），从阶段发育与叶片数量、生长度日及叶热间距3个方面解析了不同处理下阶段发育与有效积温和形态建成的关系。结果表明，在所有的处理中，Haunstage0～Haun stage2．5主茎叶片数量、生长度日和叶热间距差异性不大。Haunstage 2．5之后，陇鉴301和宁麦5号主茎生长度日和叶热间距总体上表现为高密度小、叶片较多；低密度大、相应叶片少。低密度下随着施肥水平的提高，生长度日和叶热间距增大，高密度中等肥料配比水平能够增大主茎生长度日和叶热间距，当生长阶段达到Haunstage3．5时，陇鉴301和宁麦5号生长度日和叶热间距达到整个越冬前的最大值，1R17恰好相反。

With the utility of a simple and practical wheat growth stages estimation （ Haun stages）, the relationship between wheat growth stages and thermal effect or morphogenesis were investigated in leaf number, growing degree days, and Phyllochrons herein. Under all treatments , no significant differences were observed in the leaf number, growing degree days （GDD） and Phyllochrons from Haun stage 0 to Haun stage 2.5. However, GDD and Phyllochrons for Longjian 301 and Ningmai 5 showed synergistic results after Haun stage 2.5. GDD and Phyllochrons increased with the level of fertilization under low-density, and high-density and middle level of fertilizer might increase the growing degree days （GDD）and Phyllochrons. When the growth stages reach Haun stage 3.5, GDD the and Phylloehrons for Longjian 301 and Ningmai 5 reached their maxima before overwintering, and a reverse result was obtained from1R17.