Deep-rooted perennial crops differ in capacity to stabilize C inputs in deep soil layers
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Deep-rooted perennial crops differ in capacity to stabilize C inputs in deep soil layers. / Peixoto, Leanne; Olesen, Jørgen Eivind; Elsgaard, Lars; Lønne Enggrob, Kirsten; C. Banfield, Callum ; Dippold, Michaela A.; Nicolaisen, Mette Haubjerg; Bak, Frederik; Zang, Huadong; Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian; Rasmussen, Jim.
I: Scientific Reports, Bind 12, 2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Deep-rooted perennial crops differ in capacity to stabilize C inputs in deep soil layers
AU - Peixoto, Leanne
AU - Olesen, Jørgen Eivind
AU - Elsgaard, Lars
AU - Lønne Enggrob, Kirsten
AU - C. Banfield, Callum
AU - Dippold, Michaela A.
AU - Nicolaisen, Mette Haubjerg
AU - Bak, Frederik
AU - Zang, Huadong
AU - Dresbøll, Dorte Bodin
AU - Thorup-Kristensen, Kristian
AU - Rasmussen, Jim
PY - 2022
Y1 - 2022
N2 - Comprehensive climate change mitigation necessitates soil carbon (C) storage in cultivated terrestrial ecosystems. Deep-rooted perennial crops may help to turn agricultural soils into efficient C sinks, especially in deeper soil layers. Here, we compared C allocation and potential stabilization to 150 cm depth from two functionally distinct deep-rooted perennials, i.e., lucerne (Medicago sativa L.) and intermediate wheatgrass (kernza; Thinopyrum intermedium), representing legume and non-legume crops, respectively. Belowground C input and stabilization was decoupled from nitrogen (N) fertilizer rate in kernza (100 and 200 kg mineral N ha−1), with no direct link between increasing mineral N fertilization, rhizodeposited C, and microbial C stabilization. Further, both crops displayed a high ability to bring C to deeper soil layers and remarkably, the N2-fixing lucerne showed greater potential to induce microbial C stabilization than the non-legume kernza. Lucerne stimulated greater microbial biomass and abundance of N cycling genes in rhizosphere soil, likely linked to greater amino acid rhizodeposition, hence underlining the importance of coupled C and N for microbial C stabilization efficiency. Inclusion of legumes in perennial cropping systems is not only key for improved productivity at low fertilizer N inputs, but also appears critical for enhancing soil C stabilization, in particular in N limited deep subsoils.
AB - Comprehensive climate change mitigation necessitates soil carbon (C) storage in cultivated terrestrial ecosystems. Deep-rooted perennial crops may help to turn agricultural soils into efficient C sinks, especially in deeper soil layers. Here, we compared C allocation and potential stabilization to 150 cm depth from two functionally distinct deep-rooted perennials, i.e., lucerne (Medicago sativa L.) and intermediate wheatgrass (kernza; Thinopyrum intermedium), representing legume and non-legume crops, respectively. Belowground C input and stabilization was decoupled from nitrogen (N) fertilizer rate in kernza (100 and 200 kg mineral N ha−1), with no direct link between increasing mineral N fertilization, rhizodeposited C, and microbial C stabilization. Further, both crops displayed a high ability to bring C to deeper soil layers and remarkably, the N2-fixing lucerne showed greater potential to induce microbial C stabilization than the non-legume kernza. Lucerne stimulated greater microbial biomass and abundance of N cycling genes in rhizosphere soil, likely linked to greater amino acid rhizodeposition, hence underlining the importance of coupled C and N for microbial C stabilization efficiency. Inclusion of legumes in perennial cropping systems is not only key for improved productivity at low fertilizer N inputs, but also appears critical for enhancing soil C stabilization, in particular in N limited deep subsoils.
U2 - 10.1038/s41598-022-09737-1
DO - 10.1038/s41598-022-09737-1
M3 - Tidsskriftartikel
C2 - 35396458
VL - 12
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
ER -
ID: 302905150