Optimizing trade-offs between light transmittance and intraspecific competition under varying crop layouts in a maize-soybean strip relay cropping system  

作　　者：Liang Feng Kai Shi Xin Liu Huan Yang Tian Pu Yushan Wu Taiwen Yong Feng Yang Xiaochun Wang Kees Jan van Groenigen Wenyu Yang 

机构地区：[1]College of Agronomy,Sichuan Agricultural University,211-Huimin Road,Wenjiang District,Chengdu 611130,Sichuan,China [2]Sichuan Engineering Research Center for Crop Strip Cropping Systems,Key Laboratory of Crop Ecophysiology and Farming Systems in Southwest China(Ministry of Agriculture),Chengdu 611130,Sichuan,China [3]Department of Geography,Faculty of Environment,Science and Economy,University of Exeter,Exeter EX44 RJ,UK

出　　处：《The Crop Journal》2024年第6期1780-1790,共11页作物学报（英文版）

基　　金：supported by the Annual Water and Fertilizer Efficient Utilization and Regulation Technology Research (2022YFD2300902-02);Key Cultivation Technology Innovation and Application of New Maize varieties (2021YFYZ0005);Soybean Maize Strip Mixed Cropping Planting Technology and Application in Tianfu New Area (XZY1-03);Soybean Green Increase Production and Efficiency Technology Integration and Demonstration in Meigu County (2022YFD1100203).

摘　　要：Light is one of the most important environmental factors for plant growth and development.In relay cropping systems,crop layouts influence light distribution,affecting light use efficiency(LUE).However,the response of light interception,light conversion,and LUE for relay maize and relay soybean to different crop layouts remains unclear.We aimed to quantify the effect of crop layout on intraspecific and interspecific competition,light interception,light conversion,LUE,and land productivity between relay maize and relay soybean.We conducted a field experiment for four consecutive years from 2017 to 2020 in Sichuan province,China,comparing different crop layouts(bandwidth 2.0 m,row ratio 2:2;bandwidth 2.4 m,row ratio 2:3;bandwidth 2.8 m,row ratio 2:4),with sole maize and sole soybean as controls.The results showed that relay maize in the 2.0 m bandwidth layout had the largest leaf area index and plant biomass,the lowest intraspecific competitive intensity and the highest aggressiveness.Compared to a bandwidth of 2.0 m,a bandwidth of 2.8 m significantly decreased relay maize leaf area index by 11%and plant biomass by 24%,while a 2.4 m bandwidth caused roughly half these reductions.The 2.0 m bandwidth layout also significantly improved crop light interception and LUE compared to sole maize.The light interception,light interception rate,light conversion rate and LUE in relay maize all decreased significantly with increasing bandwidth,but they increased in relay soybean.The increased light transmittance to the lower and middle canopy with increasing bandwidth did not compensate for the loss of relay maize yield caused by increased intraspecific competition.However,it enhanced the yield of relay soybeans.Increasing the bandwidth by 80 cm increased the relay maize intraspecific competition by 580%,and reduced maize yield by 33%,light interception by 12%,and LUE by 18%.In contrast,the relay soybean intraspecific competition was reduced by 64%,and the soybean yield was increased by 26%,light interception by 32%and LUE by 46

关 键 词：Crop layout Relay cropping MAIZE Intraspecific-interspecific relationships Land productivity 

分 类 号：S513[农业科学—作物学] S565.1