Soil mineral nitrogen and yield-scaled soil N2O emissions lowered by reducing nitrogen application and intercropping with soybean for sweet maize production in southern China

YiLing, Tang; Yu, Liying; Guan, Ao-mei; Zhou, Xin; Wang, Zhiguo; Gou, Yonggang; Wang, Jianwu

doi:10.1016/s2095-3119(17)61672-1

Cited by 35 publications

(14 citation statements)

References 30 publications

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“…In agricultural systems, yield-scaled N 2 O emissions were widely used as a metric of the important global challenge for guaranteeing food security and reducing N 2 O emissions [37,38]. In our study, the yield-scaled N 2 O emissions were 0.16 and 0.19 kg N Mg −1 grain in croplands after long-term cultivation (Table 3), which were similar to the results reported by Bayer et al [20] and Tang et al [39] in other subtropical regions. However, the yield-scaled N 2 O emissions in the new croplands were 21% and 106% higher than that in the long-term converted croplands (Table 3).…”

Section: Effects Of Land Use Conversion On Soil N 2 O Emissions and Ysupporting

confidence: 90%

How Tillage and Fertilization Influence Soil N2O Emissions after Forestland Conversion to Cropland

et al. 2020

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Soil nitrous oxide (N2O) emissions are influenced by land use adjustment and management practices. To meet the increasing socioeconomic development and sustainable demands for food supply, forestland conversion to cropland occurs around the world. However, the effects of forestland conversion to cropland as well as of tillage and fertilization practices on soil N2O emissions are still not well understood, especially in subtropical regions. Therefore, field experiments were carried out to continuously monitor soil N2O emissions after the conversion of forestland to cropland in a subtropical region in Southwest China. One forestland site and four cropland sites were selected: forestland (CK), short-term croplands (tillage with and without fertilization, NC-TF and NC-T), and long-term croplands (tillage with and without fertilization, LC-TF and LC-T). The annual cumulative N2O flux was 0.21 kg N ha−1 yr−1 in forestland. After forestland conversion to cropland, the annual cumulative N2O flux significantly increased by 76‒491%. In the short-term and long-term croplands, tillage with fertilization induced cumulative soil N2O emissions that were 94% and 235% higher than those from tillage without fertilization. Fertilization contributed 63% and 84% to increased N2O emissions in the short-term and long-term croplands, respectively. A stepwise regression analysis showed that soil N2O emissions from croplands were mainly influenced by soil NO3− and NH4+ availability and WFPS (water-filled pore space). Fertilization led to higher soil NH4+ and NO3− concentrations, which thus resulted in larger N2O fluxes. Thus, to reduce soil N2O emissions and promote the sustainable development of the eco-environment, we recommend limiting the conversion of forestland to cropland, and meanwhile intensifying the shift from grain to green or applying advanced agricultural management practices as much as possible.

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Section: Effects Of Land Use Conversion On Soil N 2 O Emissions and Ysupporting

confidence: 90%

How Tillage and Fertilization Influence Soil N2O Emissions after Forestland Conversion to Cropland

et al. 2020

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“…Intercropping with residue return effectively increased crop yields compared to monoculture (Figure 2). First, intercropping greatly increases the efficiency of space, water, nutrient and light utilization (Raseduzzaman & Jensen, 2017; Semere & Froud‐Williams, 2001; Tang et al., 2017), promoting niche differentiation and increasing the land equivalent ratio for yield (Zhang et al., 2011). Second, maize residue return increases SOC and SON contents (Figure ) and crop yield (Yang et al., 2017; Yin et al., 2018).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen fixation and crop productivity enhancements co‐driven by intercrop root exudates and key rhizosphere bacteria

Hao

et al. 2021

Journal of Applied Ecology

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1. Crop diversity management is widely used to increase agricultural productivity and sustainability. Recent studies have demonstrated that maize root exudates can drive interspecific facilitation to enhance N 2 fixation of bean in intercropping systems. However, the mechanisms of N 2 fixation enhancement stimulated by root exudates in the intercropping systems remain unclear.2. Four experiments were designed to provide a progressively deeper understanding of how root exudates stimulate microbial-mediated N 2 fixation. First, the effects of faba bean/maize intercropping on yields and soil microbial communities were determined in a field experiment. Second, root-derived interspecific facilitation was evaluated using a root partitioning approach. Third, the key microbial taxa in the faba bean rhizosphere were traced using 13 C-labelled maize root exudates.Fourth, the co-driven mechanism of maize root exudates and micro-organisms in the faba bean rhizosphere were explored.3. Faba bean/maize intercropping with maize residue return increased the yields of faba bean (26%), maize (27%) and broccoli (9.1%) compared to that under monocropping. Nodulin-like 4 (NODL4), chalcone-flavanone isomerase (CFI) and early nodulin-like (ENODL2) gene expression in faba bean roots intercropped with maize increased by 1.5-2.3-fold compared to that observed under monoculture.More than half of the N 2 fixation of faba bean increase under intercropping was due to interactions with micro-organisms. Nine key bacterial genera in the faba bean rhizosphere were identified by 13 C-DNA-based stable isotope probing analysis. Among them Agromyces, Arthrobacter, Bacillus, Lysobacter and Paenibacillus directly fix N 2 , while Gemmatimonas, Heliobacillus, Natronocella and Sorangium increase the N 2 fixation capacity of Azotobacter by providing additional carbon sources. These key bacteria triggered by maize root exudates played an important role in the rhizosphere facilitation of intercropping.

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“…For instance, a 3-year study in China on strip intercropping with sweet corn and soybean (Glycine max (L.) Merr.) showed a 40% reduction in soil mineral N at the time of harvest compared to the corn monoculture [29].…”

Section: Soil Healthmentioning

confidence: 91%

Advancing Intercropping Research and Practices in Industrialized Agricultural Landscapes

2018

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Sustainable intensification calls for agroecological and adaptive management of the agrifood system. Here, we focus on intercropping and how this agroecological practice can be used to increase the sustainability of crop production. Strip, mixed, and relay intercropping can be used to increase crop yields through resource partitioning and facilitation. In addition to achieving greater productivity, diversifying cropping systems through the use of strategic intercrops can increase yield stability, reduce pests, and improve soil health. Several intercropping systems are already implemented in industrialized agricultural landscapes, including mixed intercropping with perennial grasses and legumes as forage and relay intercropping with winter wheat and red clover. Because intercropping can provide numerous benefits, researchers should be clear about their objectives and use appropriate methods so as to not draw spurious conclusions when studying intercrops. In order to advance the practice, experiments that test the effects of intercropping should use standardized methodology, and researchers should report a set of common criteria to facilitate cross-study comparisons. Intercropping with two or more crops appears to be less common with annuals than perennials, which is likely due to differences in the mechanisms responsible for complementarity. One area where intercropping with annuals in industrialized agricultural landscapes has advanced is with cover crops, where private, public, and governmental organizations have harmonized efforts to increase the adoption of cover crop mixtures.

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Soil mineral nitrogen and yield-scaled soil N2O emissions lowered by reducing nitrogen application and intercropping with soybean for sweet maize production in southern China

Cited by 35 publications

References 30 publications

How Tillage and Fertilization Influence Soil N2O Emissions after Forestland Conversion to Cropland

How Tillage and Fertilization Influence Soil N2O Emissions after Forestland Conversion to Cropland

Nitrogen fixation and crop productivity enhancements co‐driven by intercrop root exudates and key rhizosphere bacteria

Advancing Intercropping Research and Practices in Industrialized Agricultural Landscapes

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