大豆“两垄一沟”栽培法冠层中光分布特点的研究

STUDY ON LIGHT DISTRIBUTION IN THE CANOPY OF "TWO RIDGES A FURROW" PLANTING PATTERN OF SOYBEAN

本文于大豆鼓粒期(R_5)晴天条件下,对“两垄一沟”栽培法冠层内叶面积指数、光照强度、干物质积累的垂直分布特点进行了研究。结果表明,该栽培法整个冠层叶面积指数大。从冠层内空间分布看,叶面积指数最大值出现的植株部位高度比70cm大垄和50cm窄行平播低,中部的光照强度高。但冠层内消光系数小。说明“两垄一沟”栽培法改善了冠层中的光照条件,提高了光能的截获率,积累了更多的干物质。

This study on light distribution in the canopy of 'two ridges a furrow' (TRAF) planting pattern of soybean was conducted under fineday condition during the R5 stage. The results showed that the highest value of LAI and extinction coefficient (K) in the canopy of TRAF were smaller than those in 70cm big ridge and 50cm sowing in drills. However, light intensity of middle canopy of TRAF was the highest. This indicated that the planting te pattern of ' two ridges a furrow' improves the conditions of light penetration of middle and bottom canopies, and increases the rate of light interception and the dry matter accunulation. It was also showm that Heinong 34 was better for improving the condition of light intensity and accumulation dry matter than Heinong 37 in this experiment.