薏苡干物质积累特性的研究

STUDY ON THE DRY MATTER ACCUMULATIONAND DISTRIBUTION OF JOB'S-TEARS

本文分析了不同品种和不同栽培条件下薏苡的干物质积累和分配特性，结果表明，薏苡一生的干物质积累动态表现为“Ｓ”型曲线，但不同品种之间差异较大，杂交种表现出较强的杂种优势，峨嵋黑壳品种较长春黑壳品种表现出更强的适应性和旺盛的生命力；全生育期都处于淹水条件（水生栽培）的植株不及栽培于湿润旱地条件（旱生栽培）的长得好，干物质积累量较旱生栽培的低；干物质在各器官中的分配因生育时期而异，亦在一定程度上受栽培条件影响，生育后期主要分配到茎秆和穗子，水生栽培下的植株根系特别发达，根系的干物质分配百分率较高。

The Characteristics of dry matter accumulation and distribution of different variety under flooded and moistured soil conditions of Job's-tears were studed. The results were as fellows: The curves of dry matter accumulation during the growing days of Job's-Tears fitted in with Logistic curve, but its varied with the varieties and planting conditions. The bybrid variety was superior to the coventional variety. The plants growing in moistured soil were superior to those growing in flooded condition all the day. The distribution of dry matter to roots of the plants growing in flooded condition all the day was higherthan that growing in moistured soil, especially in the late growth stage.