Pore-size distribution and compressibility of coarse sandy subsoil with added biochar

C.T. Petersen, Emilie Marie Øst Hansen, H.H Larsen, L.V. Hansen, Jesper Ahrenfeldt, Henrik Hauggaard-Nielsen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Sustainable agricultural production on coarse sandy soil is constrained by the restricted growth of roots, and poor water and nutrient retention. Amending the soil with biochar can reduce these problems, but the processes involved are not known in detail. We investigated in the laboratory the effects of two fine-grained gasification biochars made of straw (LTST) and other materials (LTSN) and of one fast pyrolysis straw biochar (FPST) on pore-size distribution and soil compressibility when added to coarse sandy subsoil. Water retention and therefore pore-size distribution were affected systematically. All biochars converted drainable pore space with pore diameters in the range 60-300 mu m into water-retaining pores of size 0.2-60 mu m, which was taken as an estimate of available water capacity (AWC). Effects were linear over the whole range of biochar (0-4% by mass). The effect of LTST and LTSN on AWC (3.6% by volume per % biochar) was about 70% larger than the effect of the somewhat coarser FPST biochar (2.1% by volume per % biochar). The compression index increased linearly with biochar content without any significant effects from the type of biochar. The common least squares estimate of the slope was 21.2kgm(-3)%(-1) by weight. The results reflect a strong interaction at the microscopic scale between biochar and soil rather than intrinsic properties of the added biochar.

How fine-grained biochars added to sandy soil affect water retention and soil compressibility.

Such combined effects have not been investigated previously in coarse sandy subsoil.

Pore space was changed from drainable to water retaining, and the soil became easier to compress.

Fine-grained biochars were more efficient than a coarser biochar in changing the pore space.
OriginalsprogEngelsk
TidsskriftEuropean Journal of Soil Science
Vol/bind67
Udgave nummer6
Sider (fra-til)726-736
ISSN1351-0754
DOI
StatusUdgivet - nov. 2016

Emneord

  • CARBON SEQUESTRATION
  • SOIL
  • RETENTION
  • AMENDMENT
  • DENMARK

Citer dette

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title = "Pore-size distribution and compressibility of coarse sandy subsoil with added biochar",
abstract = "Sustainable agricultural production on coarse sandy soil is constrained by the restricted growth of roots, and poor water and nutrient retention. Amending the soil with biochar can reduce these problems, but the processes involved are not known in detail. We investigated in the laboratory the effects of two fine-grained gasification biochars made of straw (LTST) and other materials (LTSN) and of one fast pyrolysis straw biochar (FPST) on pore-size distribution and soil compressibility when added to coarse sandy subsoil. Water retention and therefore pore-size distribution were affected systematically. All biochars converted drainable pore space with pore diameters in the range 60-300 mu m into water-retaining pores of size 0.2-60 mu m, which was taken as an estimate of available water capacity (AWC). Effects were linear over the whole range of biochar (0-4{\%} by mass). The effect of LTST and LTSN on AWC (3.6{\%} by volume per {\%} biochar) was about 70{\%} larger than the effect of the somewhat coarser FPST biochar (2.1{\%} by volume per {\%} biochar). The compression index increased linearly with biochar content without any significant effects from the type of biochar. The common least squares estimate of the slope was 21.2kgm(-3){\%}(-1) by weight. The results reflect a strong interaction at the microscopic scale between biochar and soil rather than intrinsic properties of the added biochar. How fine-grained biochars added to sandy soil affect water retention and soil compressibility. Such combined effects have not been investigated previously in coarse sandy subsoil. Pore space was changed from drainable to water retaining, and the soil became easier to compress. Fine-grained biochars were more efficient than a coarser biochar in changing the pore space.",
keywords = "CARBON SEQUESTRATION, SOIL, RETENTION, AMENDMENT, DENMARK, CARBON SEQUESTRATION",
author = "C.T. Petersen and Hansen, {Emilie Marie {\O}st} and H.H Larsen and L.V. Hansen and Jesper Ahrenfeldt and Henrik Hauggaard-Nielsen",
year = "2016",
month = "11",
doi = "10.1111/ejss.12383",
language = "English",
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pages = "726--736",
journal = "European Journal of Soil Science",
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Pore-size distribution and compressibility of coarse sandy subsoil with added biochar. / Petersen, C.T.; Hansen, Emilie Marie Øst; Larsen, H.H; Hansen, L.V.; Ahrenfeldt, Jesper; Hauggaard-Nielsen, Henrik.

I: European Journal of Soil Science, Bind 67, Nr. 6, 11.2016, s. 726-736 .

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Pore-size distribution and compressibility of coarse sandy subsoil with added biochar

AU - Petersen, C.T.

AU - Hansen, Emilie Marie Øst

AU - Larsen, H.H

AU - Hansen, L.V.

AU - Ahrenfeldt, Jesper

AU - Hauggaard-Nielsen, Henrik

PY - 2016/11

Y1 - 2016/11

N2 - Sustainable agricultural production on coarse sandy soil is constrained by the restricted growth of roots, and poor water and nutrient retention. Amending the soil with biochar can reduce these problems, but the processes involved are not known in detail. We investigated in the laboratory the effects of two fine-grained gasification biochars made of straw (LTST) and other materials (LTSN) and of one fast pyrolysis straw biochar (FPST) on pore-size distribution and soil compressibility when added to coarse sandy subsoil. Water retention and therefore pore-size distribution were affected systematically. All biochars converted drainable pore space with pore diameters in the range 60-300 mu m into water-retaining pores of size 0.2-60 mu m, which was taken as an estimate of available water capacity (AWC). Effects were linear over the whole range of biochar (0-4% by mass). The effect of LTST and LTSN on AWC (3.6% by volume per % biochar) was about 70% larger than the effect of the somewhat coarser FPST biochar (2.1% by volume per % biochar). The compression index increased linearly with biochar content without any significant effects from the type of biochar. The common least squares estimate of the slope was 21.2kgm(-3)%(-1) by weight. The results reflect a strong interaction at the microscopic scale between biochar and soil rather than intrinsic properties of the added biochar. How fine-grained biochars added to sandy soil affect water retention and soil compressibility. Such combined effects have not been investigated previously in coarse sandy subsoil. Pore space was changed from drainable to water retaining, and the soil became easier to compress. Fine-grained biochars were more efficient than a coarser biochar in changing the pore space.

AB - Sustainable agricultural production on coarse sandy soil is constrained by the restricted growth of roots, and poor water and nutrient retention. Amending the soil with biochar can reduce these problems, but the processes involved are not known in detail. We investigated in the laboratory the effects of two fine-grained gasification biochars made of straw (LTST) and other materials (LTSN) and of one fast pyrolysis straw biochar (FPST) on pore-size distribution and soil compressibility when added to coarse sandy subsoil. Water retention and therefore pore-size distribution were affected systematically. All biochars converted drainable pore space with pore diameters in the range 60-300 mu m into water-retaining pores of size 0.2-60 mu m, which was taken as an estimate of available water capacity (AWC). Effects were linear over the whole range of biochar (0-4% by mass). The effect of LTST and LTSN on AWC (3.6% by volume per % biochar) was about 70% larger than the effect of the somewhat coarser FPST biochar (2.1% by volume per % biochar). The compression index increased linearly with biochar content without any significant effects from the type of biochar. The common least squares estimate of the slope was 21.2kgm(-3)%(-1) by weight. The results reflect a strong interaction at the microscopic scale between biochar and soil rather than intrinsic properties of the added biochar. How fine-grained biochars added to sandy soil affect water retention and soil compressibility. Such combined effects have not been investigated previously in coarse sandy subsoil. Pore space was changed from drainable to water retaining, and the soil became easier to compress. Fine-grained biochars were more efficient than a coarser biochar in changing the pore space.

KW - CARBON SEQUESTRATION

KW - SOIL

KW - RETENTION

KW - AMENDMENT

KW - DENMARK

KW - CARBON SEQUESTRATION

U2 - 10.1111/ejss.12383

DO - 10.1111/ejss.12383

M3 - Journal article

VL - 67

SP - 726

EP - 736

JO - European Journal of Soil Science

JF - European Journal of Soil Science

SN - 1351-0754

IS - 6

ER -