Yield advantage and nitrogen fate in an additive maize-soybean relay intercropping system

被引：106

作者：

Chen, Ping ^{[1
]}

Song, Chun ^{[2
]}

Liu, Xiao-ming ^{[1
,3
]}

Zhou, Li ^{[1
,4
]}

Yang, Huan ^{[1
]}

Zhang, Xiaona ^{[1
]}

Zhou, Ying ^{[1
]}

Du, Qing ^{[1
]}

Pang, Ting ^{[1
]}

Fu, Zhi-dan ^{[1
]}

Wang, Xiao-chun ^{[1
]}

Liu, Wei-guo ^{[1
]}

Yang, Feng ^{[1
]}

Shu, Kai ^{[1
]}

Du, Junbo ^{[1
]}

Liu, Jiang ^{[1
]}

Yang, Wenyu ^{[1
]}

Yong, Taiwen ^{[1
]}

机构：

[1] Sichuan Agr Univ, Coll Agron,Minist Agr, Sichuan Engn Res Ctr Crop Strip Intercropping Sys, Key Lab Crop Ecophysiol & Farming Syst Southwest, Chengdu 611130, Sichuan, Peoples R China

[2] Sichuan Agr Univ, Coll Environm Sci, Chengdu 611130, Sichuan, Peoples R China

[3] Shehong Farm Bur, Suining 629200, Peoples R China

[4] Yibing Acad Agr Sci, Yibing 644000, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2019年 / 657卷

基金：

中国国家自然科学基金;

关键词：

Yield; Intercropping; LER; NUE; Reactive nitrogen emissions; N-15; N-USE EFFICIENCY; CROP PRODUCTIVITY; SUSTAINABLE INTENSIFICATION; AMMONIA VOLATILIZATION; N2O EMISSIONS; CHINA; FERTILIZER; PEA; FACILITATION; ENVIRONMENT;

D O I：

10.1016/j.scitotenv.2018.11.376

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Sustainable agricultural development is urgently required to satisfy future food demands while decreasing environmental costs. Intercropping can increase per-unit farmland productivity through a resource efficient utilization. However, the fate of N in intercropping systems remains unclear. To study he yield advantages and the fate of N in additive maize-soybean relay intercropping (IMS) systems, we quantified crop yield, soil N transformation abilities, soil bacterial abundances, and the fate of N-15. This study was conducted using three planting patterns, namely, monoculture maize (Zea mays L.) (MM), monoculture soybean (Glycine max L. Merr.) (MS), and IMS, and two N application rates, specifically, no N and applied N (N-1, 45 and 135 kg N ha(-1) for MS and MM, correspondingly; and N for the IMS, which was the sum of the monocultures). Results showed that a higher per-unit farmland productivity and a lower land use intensity are attained in the intercropping system than in the corresponding monocultures, In addition, land equivalent ratio (LER) ranges from 1.85 to 2.20. Moreover, the fate of N-15 showed that the N uptake and residual are the highest, whereas N loss in the MS is the lowest among all planting patterns. Intercropping had an increased N use efficiency by increasing N utilization efficiency, rather than N uptake efficiency. The abundance of ammonia oxidizer and denitrifier indicated that IMS improves the structure of soil microorganisms. Furthermore, the transformation abilities of soil N denoted that intercropping strengthens ammonifying and nitrifying capacities to increase soil N residual while decreasing ammonia volatilization and N2O emission. Finally, the greenhouse warming potential and gas intensity of N2O were significantly lower in the IMS than in the corresponding monocultures. In summary, the IMS system provides an environmentally friendly approach to increasing farmland productivity. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：987 / 999

页数：13

共 73 条

[1] Environmental impact assessment of regional switchgrass feedstock production comparing nitrogen input scenarios and legume-intercropping systems [J].