Arid
DOI10.1006/jare.2000.0734
Growth performance of exotic and indigenous tree species in saline soils in Turkana, Kenya
Oba, G; Nordal, I; Stenseth, NC; Stave, J; Bjora, CS; Muthondeki, JK; Bii, WKA
通讯作者Oba, G
来源期刊JOURNAL OF ARID ENVIRONMENTS
ISSN0140-1963
出版年2001
卷号47期号:4页码:499-511
英文摘要

In the arid zone of central Turkana, north-western Kenya, where soil salinity affects 15-20% of the rangelands, growth performances of trees planted in saline soil rehabilitation trials have not been evaluated. Tree-planting trials have emphasised exotic species over indigenous ones. However, advantages and disadvantages of promoting exotic tree species have not been examined. The current study was aimed at evaluating growth performance of seven exotic and nine indigenous tree species used in saline soil rehabilitation trials. The tree species were established from 6-month-old saplings using microcatchments (FT1) from 1988 through 1990 and Fitting treatment (FT2) from 1989 through 1992. The soils in FT1 and FT2 treatments were moderately to highly saline. The exotic tree species produced greater cover and volume during the first year (FT1) but by the second year, production was not sustained due to greater mortality (FT1 8r FT2). The indigenous species in general had higher survival rates. Relative growth rates (RGR) of exotic and indigenous species did not differ (FT1 gr FT2). Tree mortality was negatively correlated with RGR for exotic species in FT1 but not for indigenous ones. However, changes in plant performance were not in response to salinity alone. Rather, water scarcity superimposed on soil salinity might have influenced plant growth performance. Greater water and salinity stress and subsequently greater mortality in exotic species provided a more convincing reason for promotion of indigenous tree species. In the future, knowledge of salinity distribution and selection of indigenous species to match this will be a better way of rehabilitating sires affected by soil salinity in the arid zone of central Turkana, north-western Kenya. (C) 2001 Academic Press.


英文关键词Kenya microcatchments pitting range rehabilitation relative growth rates soil salinity tree growth performance tree mortality tree planting water harvesting
类型Article
语种英语
国家Norway ; Kenya
收录类别SCI-E
WOS记录号WOS:000168338400007
WOS关键词AGROFORESTRY
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/141059
作者单位(1)Agr Univ Norway, Ctr Int Environm & Dev Studies, N-1432 As Nlh, Norway;(2)Univ Oslo, Dept Biol, Div Bot & Plant Physiol, N-0316 Oslo, Norway;(3)Univ Oslo, Dept Biol, Div Zool, N-0316 Oslo, Norway;(4)Kenya Forestry Res Inst, KEFRI, Lodwar, Kenya
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GB/T 7714
Oba, G,Nordal, I,Stenseth, NC,et al. Growth performance of exotic and indigenous tree species in saline soils in Turkana, Kenya[J],2001,47(4):499-511.
APA Oba, G.,Nordal, I.,Stenseth, NC.,Stave, J.,Bjora, CS.,...&Bii, WKA.(2001).Growth performance of exotic and indigenous tree species in saline soils in Turkana, Kenya.JOURNAL OF ARID ENVIRONMENTS,47(4),499-511.
MLA Oba, G,et al."Growth performance of exotic and indigenous tree species in saline soils in Turkana, Kenya".JOURNAL OF ARID ENVIRONMENTS 47.4(2001):499-511.
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