Effect of Different Strip Distances on Light Energy Utilization in Strip Intercropping Maize
[Objective]The objective of this study is to investigate the effect of different strip distances on light energy utilization of maize in maize-soybean strip intercropping,when the single maize plant was grown in the same environment.[Method]This experiment was conducted in 2021-2022 with traditional intercropping(1MIS,2M1S)and maize-soybean strip intercropping(2M2S,2M3S,2M4S)as research objects,five maize strip distance treatments at 1 m(IMIS,1 row maize:1 row soybean),1.2 m(2M1S,2 rows maize:1 row soybean),1.6 m(2M2S,2 rows maize:2 rows soybean),2 m(2M3S,2 rows maize:3 rows soybean),2.4 m(2M4S,2 rows maize:4 rows soybean)were set,and two monocropping maize treatments were conducted as controls with a row spacing of 80 cm(M80)and 40 cm(M40),respectively.The effect of the difference of light environment on light energy interception and radiation use efficiency(RUE)of maize was analyzed.[Result]Compared to monocropping maize,strip intercropping improved the light transmission at the lower and middle part of the maize canopy,which significantly increased the leaf area and light energy utilization of maize,increased the accumulation of maize dry matter,maintained a higher net photosynthetic rate of maize leaves,and promoted the increase of yield.With the increasing distance between maize strip,the light transmittance in the lower and middle part of maize increased by 30.67％,20.62％,10.10％and 112.70％,96.35％and 79.23％for the 2M2S,2M3S and 2M4S treatments,respectively.Compared to the monocropping M80 and M40 treatments,2M4S treatment showed the 44.72％and 53.54％lower light energy interception of maize per unit land area due to the least occupied planting area,respectively,while the RUE of 2M4S treatment was 1.14 times higher than that of M80 and 2.16 times higher than that of M40.The yield of strip intercropping 2M2S,2M3S and 2M4S treatments increased by 4.97％,10.47％,13.43％and 50.05％,57.08％and 61.31％compared to that of M80 and M40 treatments,respectively.[Conclusion]When the growth environment of each single maize is consistent,the increase of the distance between maize strip improved the light transmission in the lower and middle part of the maize canopy,increased the leaf area of maize,and maintained a higher net photosynthetic rate and photosynthetic product accumulation in the leaves,which leads to the increase of maize RUE.The 2M4S treatment showed the highest light transmission in the lower and middle part of the maize,and the highest net photosynthetic rate and dry matter accumulation in maize,resulting in the highest light energy utilization and yield.
strip intercroppingmaizestrip distancelight energy utilizationyield
国家科技期刊平台
NSTL
万方数据
维普
