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Hood, Rebecca; Merckx, Roel; Jensen, Erik Steen; Powlson, D. S.; Matijevic, Mirta; Hardarson, G.

doi:10.1023/a:1004789103949

Cited by 32 publications

(7 citation statements)

References 23 publications

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“…This results in plant-specific patterns in nutrient release (Perez et al, 2013) and, hence, may contribute to littermediated PSFs. In general, home-field advantage effects may be expected to favor the plants where the litter originated from Zhang et al (2016), but nutrients released from litter may also be taken up by neighboring plant species (Hood et al, 2000;Collins et al, 2007). Therefore, the extent of plant specificity in litterinduced feedbacks via home-field advantage remains to be tested (van der Putten et al, 2016;Zhang et al, 2016).…”

Section: Biotic Pathwaysmentioning

confidence: 99%

The Role of Plant Litter in Driving Plant-Soil Feedbacks

Veen

Fry

Hooven

et al. 2019

Front. Environ. Sci.

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Most studies focusing on plant-soil feedbacks (PSFs) have considered direct interactions between plants, abiotic conditions (e. g., soil nutrients) and rhizosphere communities (e.g., pathogens, mutualists). However, few studies have addressed the role of indirect interactions mediated by plant litter inputs. This is problematic because it has left a major gap in our understanding of PSFs in natural ecosystems, where plant litter is a key component of feedback effects. Here, we propose a new conceptual framework that integrates rhizosphere-and litter-mediated PSF effects. Our framework provides insights into the relative contribution of direct effects mediated by interactions between plants and soil rhizosphere organisms, and indirect effects between plants and decomposer organisms mediated by plant root and shoot litter. We distinguish between three pathways through which senesced root and shoot litter may influence PSFs. Specifically, we examine: (1) physical effects of litter (layer) traits on seed germination, soil structure, and plant growth; (2) chemical effects of litter on concentrations of soil nutrients and secondary metabolites (e.g., allelopathic chemicals); and (3) biotic effects of saprotrophic soil communities that can perform different functional roles in the soil food web, or that may have specialized interactions with litter types, thereby altering soil nutrient cycling. We assess the role of litter in PSF effects via physical, chemical and biotic pathways to address how litter-mediated feedbacks may play out relative to, and in interaction with, feedbacks mediated through the plant rhizosphere. We also present one of the first experimental studies to show the occurrence and species-specificity of litter-mediated feedbacks and we identify critical research gaps. By formally incorporating the plant-litter feedback pathway into PSF experiments, we will further our understanding of PSFs under natural conditions.

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Section: Biotic Pathwaysmentioning

confidence: 99%

The Role of Plant Litter in Driving Plant-Soil Feedbacks

Veen

Fry

Hooven

et al. 2019

Front. Environ. Sci.

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“…Therefore, 60 atom% 15 N enriched (NH 4 ) 2 SO 4 was dissolved in tap water and applied at a rate of 9 kg N ha −1 to the soil surface between the stylo plants with a watering can. Simultaneously, sucrose (C:N ratio of 10:1) was applied, in order to promote homogenous soil N labelling through microbial turnover of the applied label (Hood et al 2000). Following Douxchamps et al (2011) to minimize leaching by the heavy rains the applied dose was split.…”

Section: Assessment Of Stylo Mulch N Recovery By Ricementioning

confidence: 99%

The contribution of Stylosanthes guianensis to the nitrogen cycle in a low input legume-rice rotation under conservation agriculture

et al. 2018

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Background and aims Legumes integrated in crop rotations are intended to improve crop nitrogen (N) supply and yield. In conservation agriculture (CA) systems under low input conditions on highly weathered tropical soils, experimental evidence for these benefits is lacking. To understand the mechanisms and evaluate the impact of the legume N on the subsequent crop, an in-depth study on N dynamics in the soil-plant system was conducted. Methods In Madagascar, a CA based crop rotation with the perennial forage legume Stylosanthes guianensis (stylo) and upland rice (rice/stylostylo -rice/stylo) was established under three fertilization regimes. In addition, rice was grown in a non-CA bare fallow rotation without fertilizer. Over the three years N 2 fixed in stylo shoots, the incorporation of stylo shoot (mulch) N into soil N pools and mulch N uptake by rice was quantified using 15 N techniques and mulch and stylo root residue decomposition was investigated in a litterbag study.Results N 2 fixed in stylo shoots ranged from 96 to 122 kg N ha −1 . Between 50 to 70% of stylo mulch and root residues decomposed during the third cropping season. Without fertilizer, grain yield of rice after the fallow with stylo was about 70% greater than after bare fallow, corresponding to 11 kg N ha −1 greater N uptake. Recoveries of stylo mulch N after rice harvest were on average 64% in soil, with about 3% in each of the microbial and mineral N pools, with 39% on the soil surface, and 6% in the rice crop. The N input via stylo seed, leaf litter and belowground N totalled about three times the amount of N contained in stylo mulch, which usually is considered as major rice N source. Conclusions Legumes, like stylo, can improve crop N supply and yield in low input CA cropping systems on highly weathered tropical soils. To explain the impact and mechanisms involved requires a consideration of all legume-N components beyond the mulch N present at the onset of the rice-cropping season. Keywords 15 N . Mulch . Symbiotic N 2 fixation . Madagascar . Litterbag study . Ferralsol . N recovery Abbreviations CA Conservation agriculture CA-NON CA based upland rice -stylo fallow rotation were rice received no fertilizer CA-FYM CA based upland rice -stylo fallow rotation were rice received farmyard manure CA-MIN CA based upland rice -stylo fallow rotation were rice received mineral fertilizer

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“…Tracing the flow of residue-derived N with an agronomic approach (N uptake measured with and without added residues) has limitations (Hood et al 2000). Several studies tracing nitrogen dynamics have been conducted in agricultural systems and natural ecosystems (Zapata and Hera 1995;Lehmann and Muraoka 2001).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen mineralization, plant uptake and nitrate leaching following the incorporation of (15N)-labeled cauliflower crop residues (Brassica oleracea) into the soil: a 3-year lysimeter study

et al. 2009

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A 3-year field lysimeter experiment was performed to determine transformations of 15N-labeled cauliflower (Brassica oleracea) residues incorporated into lysimeter topsoil in a potato (Solanum tuberosum)/cauliflower rotation. Only the potato crop received 150 kg mineral N ha −1 y −1 . Cauliflower yields were high (12-13 t fresh matter ha −1 ), and N returned to the soil represented 51% of the aboveground plant N uptake. The 15N recovery by the potato/cauliflower rotation began at 46%, then decreased sharply to 12 and 6% for the second and third year, respectively. The cumulative 15N leaching rate was only 3%; 63% remained in the soil 3 years after incorporation. Soil N mineralization rates described by a parallel first-order kinetic model predicted 27, 7 and 6% of residual N lost annually during the first, second and third year, respectively. Thus, a potato/cauliflower rotation with moderate N fertilization optimizes N recovery of crop residues and can control leaching loss efficiently.

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Untitled

Cited by 32 publications

References 23 publications

The Role of Plant Litter in Driving Plant-Soil Feedbacks

The Role of Plant Litter in Driving Plant-Soil Feedbacks

The contribution of Stylosanthes guianensis to the nitrogen cycle in a low input legume-rice rotation under conservation agriculture

Nitrogen mineralization, plant uptake and nitrate leaching following the incorporation of (15N)-labeled cauliflower crop residues (Brassica oleracea) into the soil: a 3-year lysimeter study

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