不同品种不同播期冬小麦株型和消光系数K的初步研究

采用大田切片的方法于1991年,研究了不同品种、不同播期冬小麦冠层干物重和叶面积的立体分布,群落内部相对光强的变化及其与叶面积指数和消光系数K的关系。结果表明:新冬14号10月6日播种较9月15日播种的光能利用、叶面积分布和干物重积累等优越;而奎花1号9月16日播种较10月6日播种的光能利用、叶面积分布和干物重积累优越。说明不同品种适宜播种的时期不同。

A Preliminary Study on the Relationship Between Varieties, Seedling Date and Extinction Coefficient (K Value) of Canopx Leaves of Winter Wheat Community

In this text the layer-cutting method in crop field (M. Monsi and T. Saeki, 1953) is adopted. The produce structure of communities, the distribution of light and the variation of extinction coefficient within communities under different varieties and different seedling dates condition of the winter wheat are studied. The aim is to find out a rational seedling date of winter wheat and a simple method for determination daily average extinction coefficient. The results of the experiment are shown as follows :1)Aerial biomass(dry matter weight) ,ear weight and GAI etc. of the community of later seedling in Xin Dong No. 14 are 1176. 1 g/m2, 553. 4g/m2, 2. 4 respectively. They are the highest in the community with two varieties and two seedling date. It is shown the seedling date of Oct. 6 in Xin Dong No. 14 and Sept. 15 in Kui Hua No. 1 are suitable. 2) It assumes negative correlation between relative light intensity and Green Area Index. It shows the earlier seedling date is the smaller the extinction coefficient of communities of average amount with different layer in two varieties.