不同密度杂草稻对栽培稻光合特性及灌浆进程的影响

Effect of weedy rice with different densities on photosynthetic characteristics and grain filling course of cultivated rice

以杂草稻JS-Y1和栽培稻南粳44为材料,通过田间小区试验研究了不同密度(1 m20株、1 m22株、1m24株、1 m26株、1 m28株)的杂草稻对栽培稻光合特性及灌浆进程的影响。结果表明,随着杂草稻密度的增大,栽培稻分蘖期和灌浆期的净光合速率及灌浆期的穗增重速率和净同化率均降低。不同密度杂草稻处理下的栽培稻产量分别比对照(1 m20株)处理降低了24.94%、31.40%、33.69%、60.14%。表明,杂草稻密度越大,栽培稻灌浆期的净光合速率越低,产量越小。

Weedy rice JS-Y1 and rice cultivar Nanjing 44 were selected as materials in field experiment to study the effects of different density （0 plants per 1 m2, 2 plants per 1 m2 , d plants per 1 m2, 6 plants per 1 m2, 8 plants per 1 m2 ） weedy rice on photosynthetic characteristics and grain filling course of cultivated rice. The results showed that net photosyn- thetic rate in tillering stage and grain filling stage, and net assimilation, grain filling rate at grain filling stage of cultivated rice were decreased with the increase of weedy rice density. The production of cultivated rice with densities of 2 plants per 1 ms, 4 plants per 1 ms, 6 plants per 1 ms and 8 plants per 1 m2 weedy rice decreased by 24.94%, 31.04%, 33.69%, 60.14% , respectively, compared to control（ no weedy rice planted）. It was indicated that the higher the weedy rice densi- ty, the lower the net photosynthetic rate, and the greater the yield loss of cuhivated rice.