不同栽培密度下棉花干物质累积的模拟

本文采用数学模拟方法,研究了不同栽培密度对棉花干物质累积进程的影响。同一时期无论是全株还是营养器官或生殖器官干物质积累都呈现随密度增加而减少的趋势,而密度对群体干物质累积的影响与上述情况相反,即各时期干物质累积量,低密度的明显比中、高密度的低。密度对干物质累积的上述影响都随生育期的推延而增强,一般在开花期后才出现较明显的差异。根据干物质累积规律,把干物质累积速率曲线上二个拐点之间的区域称为干物质累积的关键时期,其主要特征是在较短的时间内(一个月左右)能累积较多(占干物质总量的57.7%)的干物质。经计算,单株干物质累积的关键时期出现在7月中旬至8月中旬,这时黄淮海棉区的棉株生长正处于花铃期,这为加强花铃期的田间管理提供了一定的依据。

Simulation of the Cotton Dry-matter Accumulation with Various Densities

Aided with computer simulation,the process of cotton dry-matter accumulation and its response to the various densities are searched in the present paper.In a same period,the dry-matter weight of a plant or its organs decreased when the responsible density increased; while the colony dry-matter weight did the opposite:That is to say that the dry-matter weight was obviously lighter under low density than under medium or high density in each physiological stage.Further more,all those effects of density would b...