四川农业大学学报2025，Vol.43Issue(5)：1157-1169,1188,14.DOI:10.16036/j.issn.1000-2650.202505624
带状间作不同带宽对系统光能分配与光合能力的影响
Impact of Varying Strip Widths in Strip Intercropping Systems on Light Resource Allocation and Photosynthetic Performance
摘要
Abstract
[Objective]Strip intercropping is a key strategy for improving resource use efficiency and land productivity.This study investigates the effects of different bandwidth configurations on photosynthetic characteristics and productivity of maize within a strip intercropping system.[Method]Using a soybean-maize strip intercropping system,five bandwidth treatments were sets:1 m(1M1S,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),and 2.4 m(2M4S,2 rows maize︰4 rows soybean),along with two monocropped maize controls(M40 and M80).A systematic analysis was conducted on maize photosynthetic parameters,chlorophyll fluorescence characteristics,and yield in relation to the canopy light environment.[Result]With increasing maize bandwidth,light transmittance at the ear layer sig-nificantly improved.At the grain-filling stage,the 2M4S treatment achieved an ear-layer light transmit-tance of 0.72,which was 28.6%and 316.67%higher than in M80 and M40 monocultures,respectively.Meanwhile,the light distribution pattern shifted from a"W"to a"U"shape.The net photosynthetic rate(Pn)in the maize wide rows increased significantly with larger bandwidths.Under 2M4S,wide-row Pn was 11.24%-15.85%and 37.45%-62.57%higher than in M80 and M40,respectively.At silking,wide-row chlorophyll content in 2M4S was significantly higher than in M80(by 17.56%)and M40(by 27.28%).Chlorophyll fluorescence parameters(Fo,Fm,Fv)in the wide rows under strip intercropping in-creased by 23.46%,8.92%,and 10.31%compared to M40,and by 12.97%,6.55%,and 5.49%com-pared to M80.The activities of key photosynthetic enzymes,Rubisco and PEPC,in the wide rows of 2M4S increased by 8.1%and 47.4%relative to M80,and by 118.1%and 76.82%relative to M40.In the narrow rows,the chlorophyll a/b ratio of 2M4S decreased by 8.33%and 2.84%compared to M40 and M80,respectively.Nevertheless,increased bandwidth still led to significant improvements in narrow-row chlorophyll fluorescence parameters(Fo,Fm,Fv)compared to monoculture M40,with increases of 7.11%,5.82%,and 6.30%,while the differences compared to M80 were not significant.Rubisco activ-ity in narrow rows of 2M4S,although lower than in M80,was 64.53%higher than in M40.PEPC activity in narrow rows was lower than in M80 but not significantly different from M40;however,it was 19.51%-31.23%higher than in other intercropping treatments.The per-plant yield of the 2M4S treatment was sig-nificantly higher than that of other intercropping treatments and was increased by 61.31%and 13.4%compared to monocultures M40 and M80,respectively.This study demonstrates that increasing band-width significantly optimizes light distribution within the maize canopy,improves canopy light transmit-tance,enhances chlorophyll content and photosynthetic enzyme activity,maintains higher leaf net photo-synthetic rates,and consequently promotes yield increases.By controlling for plant and row spacing ef-fects,this research clarifies the physiological mechanisms through which bandwidth independently regu-lates photosynthetic productivity in maize.[Conclusion]Expanding strip width to 2.4 m(2M4S)opti-mized light interception in the mid-lower maize canopy,enhanced photosynthetic carbon metabolism,and improved photoprotection under high irradiance,achieving synergistic gains in light-use efficiency and pro-ductivity.These results provide a theoretical basis for optimizing field configurations in maize-soybean strip intercropping systems.关键词
带状间作/间距配置/光分布/叶绿素荧光特性/产量Key words
strip intercropping/spacing configuration/light distribution/chlorophyll fluorescence characteristics/yield分类
农业科技引用本文复制引用
付鸿宇,袁天宇,武晶,杨文钰,吴雨珊,张莉莎,汪扬媚,许红英,杨媛,李跃,郭震,龙秋凤,王丽华..带状间作不同带宽对系统光能分配与光合能力的影响[J].四川农业大学学报,2025,43(5):1157-1169,1188,14.基金项目
四川省科技计划资助(2024YFCY0010、2024NSFSC1224) （2024YFCY0010、2024NSFSC1224）
国家重点研发计划(2023YFD2000501). （2023YFD2000501）
