低平易涝地水稻群体干物质积累与分配动态的研究

Studies on the Dynamic State of Dry Matter Accumulation and Partition of Rice Population on Waterloggible Low- flat Land

由于受低平易涝地区的土壤、气候等自然因素的影响，产量不高不稳限制了水稻的进一步发展。本研究通过密度处理来探讨群体的干物质积累、分配及群体剖面构造，旨在为高产栽培模式的建立提供理论依据。试验结果表明，干物质积累呈“Ｓ”型曲线，有效分案终止期至抽穗期的群体生长率最高达２０克／平方米·日。灌浆阶段的群体生长率在１５克／平方米·日左右。叶片与茎鞘比由移栽期的１．０左右下降至抽穗期的０．３２。叶面积比自始至终在下降。不同密度问叶面积主要分布在２０～６０厘米之间。冠层内的光照分布里指数曲线，密植处理的相对照度在各个层次均明显低于稀植处理。

Because of the effect of natural elements,such as soil,climate etc. On waterloggible low flat land,unstuble and low yield restricted the development of rice production.This paper probed intothe dry matter accumulation,partition and canopy structure of rice population through density treatment in order to provide theoretical basis for the establishment of higher rice yield cultivation model.The experimental results showed that dry matter accumulation was an's' curve in shape. The cropgrowth rate(CGR) between effective tiller ending and heading stage was maximum,up to 20g/m2·d.At grain filling stage,CGR was aroumd 15g/m2·d..The ratio of leaf-blades to culm with sheathdecreased from around 1. 00 at transplanting stage to about 0.32 at headins stage. Leaf area ratio(LAR)decreased continuously. Leaf area mainly ranged from 20cm to 60cm among treatments. Thelight initensity partition in canopy was an exponental curve in shape.The relative illuminance in different layers of cose transplanting was significantly lower than that of sparse transplanting.