Effects of livestock grazing on the spatial heterogeneity of net soil nitrogen mineralization in three types of Mongolian grasslands

Muneto Hirobe, Junji Kondo, Altangerel Enkhbaatar, Narantsetseg Amartuvshin, Noboru Fujita, Keiji Sakamoto, Ken Yoshikawa, Knut Kielland

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Purpose: Small-scale soil heterogeneity relates to productivity and biodiversity and is crucial to understand. Soil heterogeneity could be affected by vegetation structure, and large mammal grazers could modify it through herbivory and excretion. The objective is to clarify the effects of livestock grazing on the small-scale (∼3 m) soil heterogeneity in three types of Mongolian grasslands. Materials and methods: We sampled soils from inside (ungrazed) and outside (grazed) exclosures in three vegetation types: forest-steppe, shrub-steppe, and desert-steppe. We measured laboratory rates of soil net nitrogen (N) mineralization and net nitrification and geostatistically analyzed heterogeneity. Results and discussion: Average rates of net N mineralization and net nitrification were lower at shrub-steppe and desert-steppe and were decreased by grazing. Semivariograms showed vegetation-induced heterogeneity in ungrazed plots, except for net nitrification at forest-steppe. We found linear change with distance under dense and uniform vegetation at forest-steppe, 1.3 m patch under patchy vegetation at shrub-steppe, and linear change, but with much smaller semivariance, under sparse and poor vegetation at desert-steppe. At forest-steppe, grazing randomized the spatial patterns of net N mineralization and net nitrification. At shrub-steppe and desert-steppe, grazing greatly decreased the semivariances of net N mineralization and net nitrification as well as their averages, and the soil heterogeneity was virtually disappeared. Conclusions: Grazing in Mongolian grasslands homogenized the spatial patterns of net N mineralization and net nitrification, irrespective of their original spatial patterns determined by the differences in vegetation structure.

Original languageEnglish
Pages (from-to)1123-1132
Number of pages10
JournalJournal of Soils and Sediments
Volume13
Issue number7
DOIs
Publication statusPublished - Aug 2013

Fingerprint

soil nitrogen
steppe
livestock
grazing
grassland
mineralization
nitrification
forest-steppe
shrub
desert
soil
vegetation
vegetation structure
effect
herbivory
excretion
vegetation type
mammal
biodiversity
productivity

Keywords

  • Livestock grazing
  • Mongolian grasslands
  • Semivariogram
  • Soil heterogeneity
  • Soil nitrogen mineralization
  • Vegetation structure

ASJC Scopus subject areas

  • Stratigraphy
  • Earth-Surface Processes

Cite this

Effects of livestock grazing on the spatial heterogeneity of net soil nitrogen mineralization in three types of Mongolian grasslands. / Hirobe, Muneto; Kondo, Junji; Enkhbaatar, Altangerel; Amartuvshin, Narantsetseg; Fujita, Noboru; Sakamoto, Keiji; Yoshikawa, Ken; Kielland, Knut.

In: Journal of Soils and Sediments, Vol. 13, No. 7, 08.2013, p. 1123-1132.

Research output: Contribution to journalArticle

Hirobe, Muneto ; Kondo, Junji ; Enkhbaatar, Altangerel ; Amartuvshin, Narantsetseg ; Fujita, Noboru ; Sakamoto, Keiji ; Yoshikawa, Ken ; Kielland, Knut. / Effects of livestock grazing on the spatial heterogeneity of net soil nitrogen mineralization in three types of Mongolian grasslands. In: Journal of Soils and Sediments. 2013 ; Vol. 13, No. 7. pp. 1123-1132.
@article{b0abd39d4ece45da930d97603d97fdc1,
title = "Effects of livestock grazing on the spatial heterogeneity of net soil nitrogen mineralization in three types of Mongolian grasslands",
abstract = "Purpose: Small-scale soil heterogeneity relates to productivity and biodiversity and is crucial to understand. Soil heterogeneity could be affected by vegetation structure, and large mammal grazers could modify it through herbivory and excretion. The objective is to clarify the effects of livestock grazing on the small-scale (∼3 m) soil heterogeneity in three types of Mongolian grasslands. Materials and methods: We sampled soils from inside (ungrazed) and outside (grazed) exclosures in three vegetation types: forest-steppe, shrub-steppe, and desert-steppe. We measured laboratory rates of soil net nitrogen (N) mineralization and net nitrification and geostatistically analyzed heterogeneity. Results and discussion: Average rates of net N mineralization and net nitrification were lower at shrub-steppe and desert-steppe and were decreased by grazing. Semivariograms showed vegetation-induced heterogeneity in ungrazed plots, except for net nitrification at forest-steppe. We found linear change with distance under dense and uniform vegetation at forest-steppe, 1.3 m patch under patchy vegetation at shrub-steppe, and linear change, but with much smaller semivariance, under sparse and poor vegetation at desert-steppe. At forest-steppe, grazing randomized the spatial patterns of net N mineralization and net nitrification. At shrub-steppe and desert-steppe, grazing greatly decreased the semivariances of net N mineralization and net nitrification as well as their averages, and the soil heterogeneity was virtually disappeared. Conclusions: Grazing in Mongolian grasslands homogenized the spatial patterns of net N mineralization and net nitrification, irrespective of their original spatial patterns determined by the differences in vegetation structure.",
keywords = "Livestock grazing, Mongolian grasslands, Semivariogram, Soil heterogeneity, Soil nitrogen mineralization, Vegetation structure",
author = "Muneto Hirobe and Junji Kondo and Altangerel Enkhbaatar and Narantsetseg Amartuvshin and Noboru Fujita and Keiji Sakamoto and Ken Yoshikawa and Knut Kielland",
year = "2013",
month = "8",
doi = "10.1007/s11368-013-0702-6",
language = "English",
volume = "13",
pages = "1123--1132",
journal = "Journal of Soils and Sediments",
issn = "1439-0108",
publisher = "Springer Science + Business Media",
number = "7",

}

TY - JOUR

T1 - Effects of livestock grazing on the spatial heterogeneity of net soil nitrogen mineralization in three types of Mongolian grasslands

AU - Hirobe, Muneto

AU - Kondo, Junji

AU - Enkhbaatar, Altangerel

AU - Amartuvshin, Narantsetseg

AU - Fujita, Noboru

AU - Sakamoto, Keiji

AU - Yoshikawa, Ken

AU - Kielland, Knut

PY - 2013/8

Y1 - 2013/8

N2 - Purpose: Small-scale soil heterogeneity relates to productivity and biodiversity and is crucial to understand. Soil heterogeneity could be affected by vegetation structure, and large mammal grazers could modify it through herbivory and excretion. The objective is to clarify the effects of livestock grazing on the small-scale (∼3 m) soil heterogeneity in three types of Mongolian grasslands. Materials and methods: We sampled soils from inside (ungrazed) and outside (grazed) exclosures in three vegetation types: forest-steppe, shrub-steppe, and desert-steppe. We measured laboratory rates of soil net nitrogen (N) mineralization and net nitrification and geostatistically analyzed heterogeneity. Results and discussion: Average rates of net N mineralization and net nitrification were lower at shrub-steppe and desert-steppe and were decreased by grazing. Semivariograms showed vegetation-induced heterogeneity in ungrazed plots, except for net nitrification at forest-steppe. We found linear change with distance under dense and uniform vegetation at forest-steppe, 1.3 m patch under patchy vegetation at shrub-steppe, and linear change, but with much smaller semivariance, under sparse and poor vegetation at desert-steppe. At forest-steppe, grazing randomized the spatial patterns of net N mineralization and net nitrification. At shrub-steppe and desert-steppe, grazing greatly decreased the semivariances of net N mineralization and net nitrification as well as their averages, and the soil heterogeneity was virtually disappeared. Conclusions: Grazing in Mongolian grasslands homogenized the spatial patterns of net N mineralization and net nitrification, irrespective of their original spatial patterns determined by the differences in vegetation structure.

AB - Purpose: Small-scale soil heterogeneity relates to productivity and biodiversity and is crucial to understand. Soil heterogeneity could be affected by vegetation structure, and large mammal grazers could modify it through herbivory and excretion. The objective is to clarify the effects of livestock grazing on the small-scale (∼3 m) soil heterogeneity in three types of Mongolian grasslands. Materials and methods: We sampled soils from inside (ungrazed) and outside (grazed) exclosures in three vegetation types: forest-steppe, shrub-steppe, and desert-steppe. We measured laboratory rates of soil net nitrogen (N) mineralization and net nitrification and geostatistically analyzed heterogeneity. Results and discussion: Average rates of net N mineralization and net nitrification were lower at shrub-steppe and desert-steppe and were decreased by grazing. Semivariograms showed vegetation-induced heterogeneity in ungrazed plots, except for net nitrification at forest-steppe. We found linear change with distance under dense and uniform vegetation at forest-steppe, 1.3 m patch under patchy vegetation at shrub-steppe, and linear change, but with much smaller semivariance, under sparse and poor vegetation at desert-steppe. At forest-steppe, grazing randomized the spatial patterns of net N mineralization and net nitrification. At shrub-steppe and desert-steppe, grazing greatly decreased the semivariances of net N mineralization and net nitrification as well as their averages, and the soil heterogeneity was virtually disappeared. Conclusions: Grazing in Mongolian grasslands homogenized the spatial patterns of net N mineralization and net nitrification, irrespective of their original spatial patterns determined by the differences in vegetation structure.

KW - Livestock grazing

KW - Mongolian grasslands

KW - Semivariogram

KW - Soil heterogeneity

KW - Soil nitrogen mineralization

KW - Vegetation structure

UR - http://www.scopus.com/inward/record.url?scp=84880846088&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84880846088&partnerID=8YFLogxK

U2 - 10.1007/s11368-013-0702-6

DO - 10.1007/s11368-013-0702-6

M3 - Article

AN - SCOPUS:84880846088

VL - 13

SP - 1123

EP - 1132

JO - Journal of Soils and Sediments

JF - Journal of Soils and Sediments

SN - 1439-0108

IS - 7

ER -