Reducing topsoil salinity and raising carbon stocks through afforestation in Khorezm, Uzbekistan

C. Hbirkou, C. Martius, Asia Khamzina, J. P A Lamers, G. Welp, W. Amelung

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Agricultural mismanagement of irrigated drylands results in severe soil degradation. Afforestation is an option for ameliorating such degraded land. We evaluated the impact afforestation has on the topsoil (0-20 cm) of salinized degraded cropland in regards to salinity, aggregate stability, and soil organic carbon (SOC) stocks in Uzbekistan, Central Asia. The effects of tree plantations established under either furrow or drip irrigation were studied four years following afforestation and two years after irrigation ceased. For comparative study we also sampled fallow land, land with 80 years of tree growth, natural forest, desert ecosystems, and paddy rice fields. Initial furrow irrigation showed to be most effective in improving soil fertility after four years of afforestation; the respective plantations of Populus euphratica and Ulmus pumila showed significant levels of reduced soil salinity and increased aggregate stability and improved SOC stocks. The comparison of the long-term afforested land with the short-term equivalent suggested a C sequestration rate of 0.09-0.15 t C ha-1 year-1. The SOC stocks of the long-term afforestation site exceeded those of the native forest. Hence, a rehabilitation of salt-affected cropland is feasible following the conversion into occasionally irrigated tree plantations, although it takes decades to reach steady-state conditions.

Original languageEnglish
Pages (from-to)146-155
Number of pages10
JournalJournal of Arid Environments
Volume75
Issue number2
DOIs
Publication statusPublished - 2011 Feb 1
Externally publishedYes

Fingerprint

Uzbekistan
afforestation
carbon sinks
topsoil
salinity
soil organic carbon
carbon
furrow irrigation
plantation
aggregate stability
plantations
organic carbon
Ulmus pumila
Populus euphratica
soil
drip irrigation
Central Asia
soil degradation
soil salinity
microirrigation

Keywords

  • Aggregate stability
  • C sequestration
  • Irrigation
  • Secondary salinization
  • Tree plantation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Earth-Surface Processes

Cite this

Reducing topsoil salinity and raising carbon stocks through afforestation in Khorezm, Uzbekistan. / Hbirkou, C.; Martius, C.; Khamzina, Asia; Lamers, J. P A; Welp, G.; Amelung, W.

In: Journal of Arid Environments, Vol. 75, No. 2, 01.02.2011, p. 146-155.

Research output: Contribution to journalArticle

Hbirkou, C. ; Martius, C. ; Khamzina, Asia ; Lamers, J. P A ; Welp, G. ; Amelung, W. / Reducing topsoil salinity and raising carbon stocks through afforestation in Khorezm, Uzbekistan. In: Journal of Arid Environments. 2011 ; Vol. 75, No. 2. pp. 146-155.
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