Potential of nine multipurpose tree species to reduce saline groundwater tables in the lower Amu Darya River region of Uzbekistan

Asia Khamzina, John P.A. Lamers, Christopher Martius, Martin Worbes, Paul L.G. Vlek

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

This paper evaluates the potential of nine multipurpose tree species for afforestation of degraded land in the Khorezm region, Central Asia, particularly their suitability for biodrainage i.e., lowering the elevated groundwater table through the transpirative capacity of plantations. For this purpose water use (WU), water use efficiency (WUE) and tree physiological factors influencing transpiration were assessed during two consecutive years. Mean daily leaf transpiration differed significantly among the species and ranged during the seasons from 4.5-5.2 mmol m-2 s-1 for Prunus armeniaca L. to 4.5-10 mmol -2 s-1 for Elaeagnus angustifolia L. WU differences were triggered by species physiological features such as capability of water uptake by roots. Transpiration rates and the length of fine roots correlated highly (r = 0.7). Correlations of leaf transpiration rates with leaf area were weaker (r = 0.6). No correlations were found between salt content in plants and water uptake under conditions of slight-to-moderate rootzone soil salinity. Values of WUE per root and shoot DM were similar averaging, respectively, 0.2 and 0.3 g DM g-1 water for two-year-old trees, and decreased with age. In addition to WU characteristics, also salinity tolerance, growth rate and the ability to produce fodder and fuelwood must be considered during species selection. Regarding these features, the N-fixing E. angustifolia ranked the highest, combining high WU, fast growth and production of nutritious feed. Examined Populus spp. and Ulmus pumila L. ranked lower but still represented potential candidates for biodrainage purposes. Typical fruit species in the region such as P. armeniaca and Morus alba, showed low biodrainage potential.

Original languageEnglish
Pages (from-to)151-165
Number of pages15
JournalAgroforestry Systems
Volume68
Issue number2
DOIs
Publication statusPublished - 2006 Oct

Keywords

  • Biodrainage
  • Root growth
  • Transpiration per unit leaf area
  • Water use efficiency

ASJC Scopus subject areas

  • Forestry
  • Agronomy and Crop Science

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