Thinning affects microbial biomass without changing enzyme activity in the soil of Pinus densiflora Sieb. et Zucc. forests after 7 years

Seongjun Kim, Guanlin Li, Seung Hyun Han, Hyun Jun Kim, Choonsig Kim, Sang Tae Lee, Yo Whan Son

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Key message: Thinning increased microbial biomass but did not alter enzyme activities in the soil ofPinus densifloraSieb. et Zucc. forests in South Korea. This effect of thinning was larger under a relatively heavy thinning intensity, but there was divergence in the magnitude between sites. Context: The balance between microbial biomass accumulation and enzymatic C and N assimilation determines the level of bio-available C and N. However, the effects of thinning on these parameters remain contradictory and unconfirmed. Aims: The effects of thinning intensity on microbial biomass and enzyme activity were assessed in the soil of Pinus densiflora Sieb. et Zucc. forests in South Korea. Methods: Un-thinned control and 15 and 30% basal area thinning treatments were applied to two 51- to 60-year-old P. densiflora forests with different management histories, topographies, rainfall amounts, and soils. Seven years after thinning, microbial biomass and activities of N-acetyl-glucosaminidase, β-glucosidase, cellobiohydrolase, β-xylosidase, phenol oxidase, and peroxidase were measured before and after seasonally concentrated rains and at 0–10 cm depth. Results: Microbial biomass was generally highest under the 30% basal area thinning and lowest under the control, and was positively correlated to total soil C and N. The increase in microbial biomass was lower at the site displaying sandier, drier, and more acidic soils and retaining smaller amounts of thinning residue. Conversely, thinning had no significant effect on activities of all enzymes at both sites in both periods. Conclusion: Thinning can promote accumulation of microbial biomass without significant change in enzyme activities participating in the assimilation of C and N. This effect of thinning tended to increase with thinning intensity but differed in magnitude between sites.

Original languageEnglish
Article number13
JournalAnnals of Forest Science
Volume75
Issue number1
DOIs
Publication statusPublished - 2018 Mar 1

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Pinus densiflora
thinning (plants)
microbial biomass
enzyme activity
thinning
biomass
soil
South Korea
basal area
assimilation (physiology)
cellulose 1,4-beta-cellobiosidase
rain
glucosidases
monophenol monooxygenase
acid soils
microbial activity
topography
phenol
biomass production

Keywords

  • Enzyme assay
  • Forest management
  • Korean red pine
  • Soil microbes

ASJC Scopus subject areas

  • Forestry
  • Ecology

Cite this

Thinning affects microbial biomass without changing enzyme activity in the soil of Pinus densiflora Sieb. et Zucc. forests after 7 years. / Kim, Seongjun; Li, Guanlin; Han, Seung Hyun; Kim, Hyun Jun; Kim, Choonsig; Lee, Sang Tae; Son, Yo Whan.

In: Annals of Forest Science, Vol. 75, No. 1, 13, 01.03.2018.

Research output: Contribution to journalArticle

Kim, Seongjun ; Li, Guanlin ; Han, Seung Hyun ; Kim, Hyun Jun ; Kim, Choonsig ; Lee, Sang Tae ; Son, Yo Whan. / Thinning affects microbial biomass without changing enzyme activity in the soil of Pinus densiflora Sieb. et Zucc. forests after 7 years. In: Annals of Forest Science. 2018 ; Vol. 75, No. 1.
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abstract = "Key message: Thinning increased microbial biomass but did not alter enzyme activities in the soil ofPinus densifloraSieb. et Zucc. forests in South Korea. This effect of thinning was larger under a relatively heavy thinning intensity, but there was divergence in the magnitude between sites. Context: The balance between microbial biomass accumulation and enzymatic C and N assimilation determines the level of bio-available C and N. However, the effects of thinning on these parameters remain contradictory and unconfirmed. Aims: The effects of thinning intensity on microbial biomass and enzyme activity were assessed in the soil of Pinus densiflora Sieb. et Zucc. forests in South Korea. Methods: Un-thinned control and 15 and 30{\%} basal area thinning treatments were applied to two 51- to 60-year-old P. densiflora forests with different management histories, topographies, rainfall amounts, and soils. Seven years after thinning, microbial biomass and activities of N-acetyl-glucosaminidase, β-glucosidase, cellobiohydrolase, β-xylosidase, phenol oxidase, and peroxidase were measured before and after seasonally concentrated rains and at 0–10 cm depth. Results: Microbial biomass was generally highest under the 30{\%} basal area thinning and lowest under the control, and was positively correlated to total soil C and N. The increase in microbial biomass was lower at the site displaying sandier, drier, and more acidic soils and retaining smaller amounts of thinning residue. Conversely, thinning had no significant effect on activities of all enzymes at both sites in both periods. Conclusion: Thinning can promote accumulation of microbial biomass without significant change in enzyme activities participating in the assimilation of C and N. This effect of thinning tended to increase with thinning intensity but differed in magnitude between sites.",
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T1 - Thinning affects microbial biomass without changing enzyme activity in the soil of Pinus densiflora Sieb. et Zucc. forests after 7 years

AU - Kim, Seongjun

AU - Li, Guanlin

AU - Han, Seung Hyun

AU - Kim, Hyun Jun

AU - Kim, Choonsig

AU - Lee, Sang Tae

AU - Son, Yo Whan

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Key message: Thinning increased microbial biomass but did not alter enzyme activities in the soil ofPinus densifloraSieb. et Zucc. forests in South Korea. This effect of thinning was larger under a relatively heavy thinning intensity, but there was divergence in the magnitude between sites. Context: The balance between microbial biomass accumulation and enzymatic C and N assimilation determines the level of bio-available C and N. However, the effects of thinning on these parameters remain contradictory and unconfirmed. Aims: The effects of thinning intensity on microbial biomass and enzyme activity were assessed in the soil of Pinus densiflora Sieb. et Zucc. forests in South Korea. Methods: Un-thinned control and 15 and 30% basal area thinning treatments were applied to two 51- to 60-year-old P. densiflora forests with different management histories, topographies, rainfall amounts, and soils. Seven years after thinning, microbial biomass and activities of N-acetyl-glucosaminidase, β-glucosidase, cellobiohydrolase, β-xylosidase, phenol oxidase, and peroxidase were measured before and after seasonally concentrated rains and at 0–10 cm depth. Results: Microbial biomass was generally highest under the 30% basal area thinning and lowest under the control, and was positively correlated to total soil C and N. The increase in microbial biomass was lower at the site displaying sandier, drier, and more acidic soils and retaining smaller amounts of thinning residue. Conversely, thinning had no significant effect on activities of all enzymes at both sites in both periods. Conclusion: Thinning can promote accumulation of microbial biomass without significant change in enzyme activities participating in the assimilation of C and N. This effect of thinning tended to increase with thinning intensity but differed in magnitude between sites.

AB - Key message: Thinning increased microbial biomass but did not alter enzyme activities in the soil ofPinus densifloraSieb. et Zucc. forests in South Korea. This effect of thinning was larger under a relatively heavy thinning intensity, but there was divergence in the magnitude between sites. Context: The balance between microbial biomass accumulation and enzymatic C and N assimilation determines the level of bio-available C and N. However, the effects of thinning on these parameters remain contradictory and unconfirmed. Aims: The effects of thinning intensity on microbial biomass and enzyme activity were assessed in the soil of Pinus densiflora Sieb. et Zucc. forests in South Korea. Methods: Un-thinned control and 15 and 30% basal area thinning treatments were applied to two 51- to 60-year-old P. densiflora forests with different management histories, topographies, rainfall amounts, and soils. Seven years after thinning, microbial biomass and activities of N-acetyl-glucosaminidase, β-glucosidase, cellobiohydrolase, β-xylosidase, phenol oxidase, and peroxidase were measured before and after seasonally concentrated rains and at 0–10 cm depth. Results: Microbial biomass was generally highest under the 30% basal area thinning and lowest under the control, and was positively correlated to total soil C and N. The increase in microbial biomass was lower at the site displaying sandier, drier, and more acidic soils and retaining smaller amounts of thinning residue. Conversely, thinning had no significant effect on activities of all enzymes at both sites in both periods. Conclusion: Thinning can promote accumulation of microbial biomass without significant change in enzyme activities participating in the assimilation of C and N. This effect of thinning tended to increase with thinning intensity but differed in magnitude between sites.

KW - Enzyme assay

KW - Forest management

KW - Korean red pine

KW - Soil microbes

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