水分胁迫对冬小麦农艺性状的影响及两者间的定量数学模型

以冬小麦济麦20为材料,研究了不同土壤水分条件下小麦株高、节间长、各器官干重的变化及其与水分之间的定量数学模型。本试验轻度干旱胁迫下,茎秆高度降低为适宜水分的63.4%～73.2%,穗下节间却增加了9.2%;严重干旱时,穗下节间缩短,倒2和倒3节间长度先下降再上升;各器官干物质积累除根重上升之外,茎、叶、穗重量均下降。水分由适宜向过多变化的过程中,穗下节间长度、倒2与倒3节间长度先上升,再下降,各器官的干重变化趋势也呈现先上升再下降的趋势。以水分变化为自变量,株高、各器官干重等为因变量建立的函数关系方程多为一元三次方程,检验证明其有较高的可靠性。

Effect of Water Stress on Agronomic Characters of Winter Wheat and Their Quantitative Mathematical Models

With the winter wheat variety Jimai 20 as experimental material,the variation of plant height,panel length and dry weight of organs were studied and the quantitative mathematical models between agronomic characters and moisture content in soil were established.Under the conditions of slight drought stress,the stem height was 63.4%～73.2% of that under appropriate moisture,while the internode length under ear increased by 9.2%.Under severe drought,the length of internode under ear got shorter,while the length of penultimate and the third internode from top decreased firstly and then increased.The dry matter accumulation of stem,leaves and spikelets decreased while that of root increased.The length of the internode under ear,penultimate and the third internode from top increased firstly and then declined during the soil moisture processing from appropriate to waterlogged,and also the variation of dry matter of organs.Most of the quantitative models were cubic characteristic equations with the moisture variation as independent variable and the agronomic characters as dependent variables.