摘要
采用根箱法和大田根土切片法,结合CID600图象分析系统对烤烟根系构型和动态建成规律进行了研究,结果表明,烤烟根系生物量随土层深度增加呈指数递减,以0～20cm土层中的最高;不同生育时期根系构型均呈“T”型,主要由一级侧根决定,其分布的角度范围为0～90°,其生物量集中在20°～50°区间,占总量的60.7%,二级侧根数量集中在50°～80°区间,占其总量的56%;不定根按着生位置与发生先后可分为3轮,愈靠近土壤上层,其分布愈与垄土表面平行;生产中基肥的几种不同施用方式未改变根系“T”型结构,但影响其在不同土层中的分布。根系生物量在苗期、移栽至成熟前期随发育进程呈指数递增(还苗时期除外),而在同一深度土层内随时间进程呈线性增长。
Root-boxing and rhizosphere section-cutting in the field were adopted to study the configuration and dynamic formation of root system in flue-cured tobacco with the help of a CID-600 image-processing system .The results showed that the biomass of the root system of flue-cured tobacco was exponentially decreased with the increase of soil depth, reaching its maximum in 0-20 cm ; the configurations of the root system took the 'T' shapes in different stages of growth, and were mainly composed of its initial lateral roots whose distributing angle ranged between 0°and 90°, and whose biomass mainly concentrated between 20°and 50°, accounting for 60.7% of the total root-system ; the secondary lateral roots of the root system mainly distributed between 50°-80°, accounting for 56% of the total root-system; the adventitious roots of the root-system could be divided into three groups depended on their initiate positions and sequences of growth, and became more parallel to the ridge surface as their positions were near the upper layer of soil; the different ways of base fertilizer use in production did not significantly change the T-shaped configuration of the root system, which was typical in upper soil and a typical in lower soil, but had an effect on the distribution of the roots in different depth of soil. The biomass of the root system was exponentially increased during the seedling stage and the stage from transplanting to maturing (not including transplanting shock), and linearly increased with time in the same depth layer of soil.
出处
《作物学报》
CAS
CSCD
北大核心
2005年第7期915-920,共6页
Acta Agronomica Sinica
基金
湖南省烟草专卖局重点项目(K2003002)资助。
关键词
烟草
根系构型
分布特征
动态建成
不定根
Tobacco
Root-system configuration
Distributing pattern
Dynamic formation
Adventitious roots
