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以新两优6号(籼稻)和南粳46(粳稻)为材料,自水稻移栽至成熟分别与无芒稗(T1)、稗(T2)、西来稗(T3)和光头稗(T4)共生,稗草密度为6株·m-2,以无稗草水稻处理为对照,研究不同稗草对水稻生长发育和产量的影响.结果表明:与对照相比,不同稗草对水稻的干扰表现不同,T1、T2、T3处理使籼稻产量分别下降19.2%、10.8%、21.9%,使粳稻产量分别下降39.7%、25.3%、47.3%,但T4处理对2个水稻品种的产量均无显著影响.水稻和稗草共生过程中,T1、T2和T3处理显著降低了水稻成熟期的干物质积累量及灌浆期的剑叶光合速率、根系氧化力和籽粒ATP酶活性,降低幅度为T3>T1>T2,T4处理与对照差异不显著;各处理对水稻最终分蘖数和株高均无显著影响.表明4种稗草对水稻生长的影响由强到弱表现为:T3>T1>T2>T4,稻-稗共生时水稻剑叶光合速率、根系氧化力和籽粒ATP酶活性降低是导致水稻生产力下降的重要原因.
The effects of transplanting rice to mature rice with barley (T1), barnyardgrass (T2), barnyardgrass (T3) and barnyardgrass (T4) ), Barnyard grass density of 6 plants · m-2, with no barnyard grass treatment as a control to study the different barnyard grass on the growth and yield of rice.The results showed that: compared with the control, different barnyard grass on rice The yield of indica rice decreased by 19.2%, 10.8% and 21.9%, respectively, and the yield of japonica rice decreased by 39.7%, 25.3% and 47.3% respectively under T1, T2 and T3 treatments. However, the yield of two rice cultivars with no T4 treatment was Significantly increased.The synergistic effects of T1, T2 and T3 treatments on dry matter accumulation and flag leaf photosynthetic rate, oxidative stress and ATPase activity in flag leaves at grain filling stage decreased with T3 > T1> T2, T4 and the control had no significant difference.These treatments had no significant effect on the final tiller number and plant height of rice.The results showed that the effects of four barnyardgrass on the growth of rice from strong to weak were: T3> T1> T2 > T4, the photosynthetic rate of flag leaves, oxidative stress in roots and the decrease of ATPase activity in rice were the most important factors that led to the decrease of rice productivity the reason.