Relay strip intercropping of soybeans and maize achieves high net ecosystem economic benefits by boosting land output and alleviating greenhouse gas emissions

单作 间作 温室气体 农学 环境科学 生态系统 生物 生态学
作者
Zhidan Fu,Ping Chen,Kai Luo,Ping Lin,Yiling Li,Pu Tian,Yüze Li,Yushan Wu,Xiaochun Wang,Wenyu Yang,Taiwen Yong
出处
期刊:Journal of the Science of Food and Agriculture [Wiley]
标识
DOI:10.1002/jsfa.13968
摘要

Abstract BACKGROUND Cereal–legume intercropping provides a solution for achieving global food security, but the mechanism of greenhouse gas emissions and net ecosystem economic benefits of maize–soybean relay intercropping are poorly understood. Hence, we conducted a two‐factor experiment to investigate the effects of cropping systems, containing maize–soybean relay intercropping (IMS), monoculture maize (M) and monoculture soybean (S), as well as three nitrogen levels at 0 (N0), 180 (N1), 240 (N2) kg N ha −1 on crop grain yield, greenhouse gas emissions, soil carbon stock and net ecosystem economic benefit (NEEB). RESULTS The average grain yield of IMS (7.7 t ha −1 ) increased by 28.5% and 242.4% compared with M (6.0 t ha −1 ) and S (2.2 t ha −1 ). The land equivalent ratio (LER) of IMS was 2.0, which was mainly contributed by maize (partial LER: 1.2) rather than soybean (partial LER: 0.8). Although the total grain yield of IMS remarkably enhanced by 43.6% and 45.5% in N1 and N2 contrast in N0, the LER was 37.5% and 38.6% lower in N1 and N2 than in N0. The net global warming potential (GWP) of maize and soybean was 11.6% and 1.8% lower in IMS than in the corresponding monoculture, which resulted from a decline in GWP and enhanced soil organic carbon stock rate. Moreover, NEEB was 133.5% higher in IMS (14 032.0 Chinese yuan per year) than in M, mainly resulting from an increase in total economic gains and a decline in GWP cost. A more robust response in yield gain rather than total costs to N inputs of IMS led to 46.8% and 48.3% higher NEEB in N1 and N2 than in N0. CONCLUSION Maize–soybean relay intercropping with 180 kg N ha −1 application can obtain yield advantages without raising environmental costs, which provides an approach to achieving sustainable agricultural production. © 2024 Society of Chemical Industry.
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