UV-B增强对中高海拔干旱半干旱地区春小麦植株形态的影响

以春小麦"宁春4号"为供试材料,采用大田定位试验,利用可升降式紫外灯装置,观测增加不同剂量UV-B情况下春小麦的株高、绿叶数及叶部形态的变化状况.连续两年的试验结果显示,UV-B增强使春小麦植株矮化、绿叶数减少、叶角变小、单叶叶面积减小.单叶叶面积减小的原因是叶长和叶宽都有所减少.多数情况下,随着UV-B辐射增加量越多,春小麦株高和叶形态受到的影响程度越大.在中高海拔干旱半干旱地区,UV-B增强使春小麦的株型缩小、绿叶教减少,这会对春小麦的于物质积累和籽粒形成产生不利影响.

Effects of enhanced Ultraviolet radiation-B on plant form of spring wheat in arid and semiarid regions of middle-high elevation

The article studied influence of enhanced ultraviolet radiation-B on plant form of spring wheat in arid and semiarid regions of middle-high elevation.Using lift lamp of UV-B,we observed plant height,green leaf number and leaf form of spring wheat"Ningchun 4"at different UV-B exposure dose in field condition.Field trail for two years showed that enhanced UV-B reduced plant height,green-leaf number,leaf angle,and single leaf area of spring wheat,the reason of small single leaf area was in decrease of both leaf length and leaf width.In the most conditions,enhanced ultraviolet radiation-B exposure dose is harmful for upgrowth of spring wheat.Enhanced UV-B shrink plant form and decreased green-leaf number of spring wheat in arid and semiarid regions of middle-high elevation.It is very disadvantageous for dry matter production and yield of spring wheat.