Altered microbial communities and nitrogen availability in temperate forest edges

Elyn Remy; Karen Wuyts; Kris Verheyen; Per Gundersen; Pascal Boeckx

doi:10.1016/j.soilbio.2017.10.016

Altered microbial communities and nitrogen availability in temperate forest edges

Elyn Remy, Karen Wuyts, Kris Verheyen, Per Gundersen, Pascal Boeckx

Forest, Nature and Biomass

8 Citations (Scopus)

Abstract

Due to forest fragmentation, forest edges have become dominant features in landscapes around the world. Forest edges are exposed to a different microclimate and to higher atmospheric nitrogen (N) deposition compared to the forest interior. It is still unclear how both factors affect N cycling at temperate forest edges. In this study, the microbial community structure was mapped using phospholipid fatty acids (PLFA) in forest edge (0–5 m) and interior (64 m) in two oak (Quercus robur) stands, two pine (Pinus nigra) stands and one spruce (Picea sitchensis) stand in northern Belgium and Denmark. Nitrogen mineralization, nitrification and immobilization rates were obtained via the in situ ¹⁵N pool dilution technique in the forest edge and interior, and linked to the microbial community structure. Furthermore, we assessed ¹⁵N recovery in simulated throughfall via the ¹⁵N tracing method in edge and interior as a proxy for the long-term fate of mineral N. Microbial biomass was higher at the forest edges compared to the forest interiors and was associated to the higher gross mineralization rates. Gross nitrification rates were not increased at the edge, hereby preventing NO₃⁻ leaching losses. Gross and net nitrification rates differed between the forest types, where the oak stands were characterized by higher nitrification rates than the pine and spruce stands. The oak stand retained ¹⁵NO₃⁻ in the mineral soil at the edge, while in the pine stand the polyphenol-rich litter layer retained more ¹⁵NO₃⁻ in the forest interior. Overall, our results indicated that the specific characteristics of the forest edge (atmospheric deposition, microclimate, pH of mineral soil and C/N ratio of the forest floor) increased microbial biomass and gross mineralization rates. Given the omnipresence of forest edges, more research should be conducted to validate our observations for other forest and soil types.

Original language	English
Journal	Soil Biology & Biochemistry
Volume	116
Pages (from-to)	179-188
Number of pages	10
ISSN	0038-0717
DOIs	https://doi.org/10.1016/j.soilbio.2017.10.016
Publication status	Published - Jan 2018

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title = "Altered microbial communities and nitrogen availability in temperate forest edges",

abstract = "Due to forest fragmentation, forest edges have become dominant features in landscapes around the world. Forest edges are exposed to a different microclimate and to higher atmospheric nitrogen (N) deposition compared to the forest interior. It is still unclear how both factors affect N cycling at temperate forest edges. In this study, the microbial community structure was mapped using phospholipid fatty acids (PLFA) in forest edge (0–5 m) and interior (64 m) in two oak (Quercus robur) stands, two pine (Pinus nigra) stands and one spruce (Picea sitchensis) stand in northern Belgium and Denmark. Nitrogen mineralization, nitrification and immobilization rates were obtained via the in situ 15N pool dilution technique in the forest edge and interior, and linked to the microbial community structure. Furthermore, we assessed 15N recovery in simulated throughfall via the 15N tracing method in edge and interior as a proxy for the long-term fate of mineral N. Microbial biomass was higher at the forest edges compared to the forest interiors and was associated to the higher gross mineralization rates. Gross nitrification rates were not increased at the edge, hereby preventing NO3− leaching losses. Gross and net nitrification rates differed between the forest types, where the oak stands were characterized by higher nitrification rates than the pine and spruce stands. The oak stand retained 15NO3− in the mineral soil at the edge, while in the pine stand the polyphenol-rich litter layer retained more 15NO3− in the forest interior. Overall, our results indicated that the specific characteristics of the forest edge (atmospheric deposition, microclimate, pH of mineral soil and C/N ratio of the forest floor) increased microbial biomass and gross mineralization rates. Given the omnipresence of forest edges, more research should be conducted to validate our observations for other forest and soil types.",

author = "Elyn Remy and Karen Wuyts and Kris Verheyen and Per Gundersen and Pascal Boeckx",

year = "2018",

month = jan,

doi = "10.1016/j.soilbio.2017.10.016",

language = "English",

volume = "116",

pages = "179--188",

journal = "Soil Biology & Biochemistry",

issn = "0038-0717",

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TY - JOUR

T1 - Altered microbial communities and nitrogen availability in temperate forest edges

AU - Remy, Elyn

AU - Wuyts, Karen

AU - Verheyen, Kris

AU - Gundersen, Per

AU - Boeckx, Pascal

PY - 2018/1

Y1 - 2018/1

N2 - Due to forest fragmentation, forest edges have become dominant features in landscapes around the world. Forest edges are exposed to a different microclimate and to higher atmospheric nitrogen (N) deposition compared to the forest interior. It is still unclear how both factors affect N cycling at temperate forest edges. In this study, the microbial community structure was mapped using phospholipid fatty acids (PLFA) in forest edge (0–5 m) and interior (64 m) in two oak (Quercus robur) stands, two pine (Pinus nigra) stands and one spruce (Picea sitchensis) stand in northern Belgium and Denmark. Nitrogen mineralization, nitrification and immobilization rates were obtained via the in situ 15N pool dilution technique in the forest edge and interior, and linked to the microbial community structure. Furthermore, we assessed 15N recovery in simulated throughfall via the 15N tracing method in edge and interior as a proxy for the long-term fate of mineral N. Microbial biomass was higher at the forest edges compared to the forest interiors and was associated to the higher gross mineralization rates. Gross nitrification rates were not increased at the edge, hereby preventing NO3− leaching losses. Gross and net nitrification rates differed between the forest types, where the oak stands were characterized by higher nitrification rates than the pine and spruce stands. The oak stand retained 15NO3− in the mineral soil at the edge, while in the pine stand the polyphenol-rich litter layer retained more 15NO3− in the forest interior. Overall, our results indicated that the specific characteristics of the forest edge (atmospheric deposition, microclimate, pH of mineral soil and C/N ratio of the forest floor) increased microbial biomass and gross mineralization rates. Given the omnipresence of forest edges, more research should be conducted to validate our observations for other forest and soil types.

AB - Due to forest fragmentation, forest edges have become dominant features in landscapes around the world. Forest edges are exposed to a different microclimate and to higher atmospheric nitrogen (N) deposition compared to the forest interior. It is still unclear how both factors affect N cycling at temperate forest edges. In this study, the microbial community structure was mapped using phospholipid fatty acids (PLFA) in forest edge (0–5 m) and interior (64 m) in two oak (Quercus robur) stands, two pine (Pinus nigra) stands and one spruce (Picea sitchensis) stand in northern Belgium and Denmark. Nitrogen mineralization, nitrification and immobilization rates were obtained via the in situ 15N pool dilution technique in the forest edge and interior, and linked to the microbial community structure. Furthermore, we assessed 15N recovery in simulated throughfall via the 15N tracing method in edge and interior as a proxy for the long-term fate of mineral N. Microbial biomass was higher at the forest edges compared to the forest interiors and was associated to the higher gross mineralization rates. Gross nitrification rates were not increased at the edge, hereby preventing NO3− leaching losses. Gross and net nitrification rates differed between the forest types, where the oak stands were characterized by higher nitrification rates than the pine and spruce stands. The oak stand retained 15NO3− in the mineral soil at the edge, while in the pine stand the polyphenol-rich litter layer retained more 15NO3− in the forest interior. Overall, our results indicated that the specific characteristics of the forest edge (atmospheric deposition, microclimate, pH of mineral soil and C/N ratio of the forest floor) increased microbial biomass and gross mineralization rates. Given the omnipresence of forest edges, more research should be conducted to validate our observations for other forest and soil types.

U2 - 10.1016/j.soilbio.2017.10.016

DO - 10.1016/j.soilbio.2017.10.016

M3 - Journal article

SN - 0038-0717

VL - 116

SP - 179

EP - 188

JO - Soil Biology & Biochemistry

JF - Soil Biology & Biochemistry

ER -

Altered microbial communities and nitrogen availability in temperate forest edges

Abstract

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