Quantification of spatial-temporal light interception of crops in different configurations of soybean-maize strip intercropping

作者：Fu Jin, Zhihua Wang, Haizhao Zhang, Sirong Huang, Meng Chen, Titriku John Kwame, Taiwen Yong, Xiaochun Wang, Feng Yang, Jiang Liu, Liang Yu, Pu Tian, Akash Fatima, Raheela Rahman, Yanhong Yan, Wenyu Yang, Yushan Wu · 发表于：Frontiers in Plant Science · 年份：2024 · DOI：10.3389/fpls.2024.1376687 · 被引用次数：13 · 研究领域：Agronomic Practices and Intercropping Systems、Agroforestry and silvopastoral systems、Plant pathogens and resistance mechanisms

Intercropping can improve light interception and crop yield on limited farmlands. The light interception rate in intercropping is determined by row configuration. Quantifying the spatio-temporal light interception of intercrops is very important for improving crop yields by optimizing the row configuration. A two-year field experiment was conducted at two sites to quantify the responses of the light interception rate of intercrops to five treatments: two rows of maize alternated with three rows of soybean (2M3S), two rows of maize alternated four rows of soybean (2M4S), two rows of maize alternated five rows of soybean (2M5S), sole soybean (SS), and sole maize (SM). We developed a multiple regression model based on the sine of the solar elevation angle (sin(h)) and crop leaf area density (LAD) to quantify the spatio-temporal light interception of intercrops. The predicted light interception rate was positively correlated with the measured values of photosynthetically active radiation (R 2 > 0.814) and dry matter (R 2 > 0.830). Increasing soybean rows led to an increase in light interception of both soybean and the lower layer of maize. However, this also resulted in a decrease in light interception in the upper layer of maize. At the two sites, compared to 2M3S, the annual average cumulative light interception of soybean in 2M5S increased by 44.73% and 47.18%, that of the lower layer of maize in 2M5S increased by 9.25% and 8.04%, and that of whole canopy of maiz...