☆ 4.6 Article

PAR Interception and Utilization in Different Maize and Soybean Intercropping Patterns

PLOS ONE (2017)

Journal

PLOS ONE

Volume 12, Issue 1, Pages -

Publisher

PUBLIC LIBRARY SCIENCE

DOI: 10.1371/journal.pone.0169218

Keywords

Funding

National Key Research and Development Program of China [2016YFD0300209, 2016YFD0300602]
National Natural Science Foundation [31571615]
Program on Industrial Technology System of National Soybean [CARS-04-PS19]

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Abstract

The crop intercepted photosynthetically active radiation (PAR) and radiation use efficiency (RUE) vary markedly in different intercropping systems. The HHLA (horizontally homogeneous leaf area) and ERCRT (extended row crop radiation transmission) models have been established to calculate the intercepted PAR for intercrops. However, there is still a lack of study on the intercepted PAR and RUE under different intercropping configurations using different models. To evaluate the intercepted PAR and RUE in maize and soybean under different intercropping systems, we tested different strip intercropping configurations (SI 1, S12, and S13 based on ERCRT model) and a row intercropping configurations (RI based on HHLA model) in comparison to monoculture. Our results showed that the intercepted PAR and RUE of intercropping systems were all higher than those of monoculture. The soybean intercepted PAR in strip intercropping was 1.35 times greater than that in row intercropping. In row intercropping (RI), the lack of soybean intercepted PAR resulted in a significant reduction of soybean dry matter. Therefore, it is not the recommended configuration for soybean. In strip intercropping patterns, with the distance between maize strip increased by 0.2 m, the intercepted PAR of soybean increased by 20%. The S12 (maize row spacing at 0.4 m and the distance between maize strip at 1.6 m) was the recommended configuration to achieve the highest value of intercepted PAR and RUE among tested strip intercropping configurations. The method of dry matter estimation using intercepted PAR and RUE is useful in simulated experiments. The simulated value was verified in comparison with experimental data, which confirmed the credibility of the simulation model. Moreover, it also provides help in the development of functional-structural plant model (FSPM).

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Modelling soybean and maize growth and grain yield in strip intercropping systems with different row configurations

Yushan Wu, Di He, Enli Wang, Xin Liu, Neil I. Huth, Zhigan Zhao, Wanzhuo Gong, Feng Yang, Xiaochun Wang, Taiwen Yong, Jiang Liu, Weiguo Liu, Junbo Du, Tian Pu, Chunyan Liu, Liang Yu, Wopke van der Werf, Wenyu Yang

Summary: Intercropping of multiple crop species can increase resource use efficiency and yield per unit land area. However, modeling the effects of different row configurations on intercropping efficiency is challenging due to the variability of key model parameters with spacing and configuration. This study shows that a light interception model combined with a quasi-Bayesian approach can be used to evaluate the impact of planting configurations on productivity of strip intercropping systems, but further research is needed to improve modeling physiology of strip intercrops.

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