杂草稻竞争对栽培稻群体干物质生产和籽粒灌浆的影响

摘要

以杂草稻wr03-12和栽培稻沈农265为材料,采用田间试验研究了杂草稻竞争对栽培稻群体干物质生产和籽粒灌浆的影响.结果表明:杂草稻竞争对栽培稻群体的光合速率和蒸腾速率的影响不大,栽培稻群体生物产量、叶干重、穗干重、鞘干重和茎干重均随杂草稻密度的增大而降低,且均与杂草稻的密度呈极显著负相关.杂草稻密度加大,栽培稻籽粒灌浆的起始时间延迟,灌浆持续时间缩短.杂草稻竞争对二次枝梗的影响大于一次枝梗,对下部籽粒的影响大于上部籽粒.杂草稻竞争很可能通过影响栽培稻干物质生产和籽粒灌浆特性而影响栽培稻的最终产量.%Weedy rice WR03 -12 and cultivated rice Shennong265 were used in the field experiment to study the effects of weedy rice on dry matter accumulation and grain filling of cultivated rice. The results showed that the competition of weedy rice had little effect on photosynthetic rate and the transpiration rate of the cultivated rice. Biological yield, leaf dry weight, panicle dry weight, stem and sheath dry weight of cultivated rice were linearly with the increase of weedy rice density, and all the traits of cultivated rice were very significantly negative with weeds. When the density of the weedy rice increased, cultivated rice grain delayed and shortened grain fill. The competition effect of weedy rice on the secondary branch was greater than on the primary branch. Weedy rice competition is likely to affect the dry matter production of cultivated rice and influence the final yield of rice.