Environmental triggers of germination and phenological events in an arid savannah region of northern Kenya
Identifieur interne : 001757 ( Istex/Corpus ); précédent : 001756; suivant : 001758Environmental triggers of germination and phenological events in an arid savannah region of northern Kenya
Auteurs : George A. KeyaSource :
- Journal of Arid Environments [ 0140-1963 ] ; 1997.
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- KwdEn :
Abstract
Germination, seedling emergence, growth and phenological patterns of two plant species found in an arid savannah region of Kenya were studied in relation to watering, rainfall and soil moisture under laboratory and field conditions. An initial 5 mm watering event triggered seedling emergence ofLeptothrium senegalense(Kunth.) under laboratory conditions. Under field conditions, 24·3 mm and 9·6 mm of rainfall evoked emergence of the grass seedlings in rain-fed and irrigated plots, respectively, while 26·9 mm was necessary to evoke emergence ofIndigofera spinosa(Forsk.). Watering alone did not evoke seedling emergence under field conditions. Seedling emergence was also associated with high relative humidity and low evaporative demand. Results confirmed a staggered seedling emergence pattern in both species. Seedling density was higher forL. senegalensethanI. spinosa, indicating their r/k strategies. Grass seedlings were able to achieve reproductive maturity even under conditions of severe moisture stress (within 34 days) after 31·9 mm of rain.Indigofera spinosaseedlings, however, never attained the reproductive stage. A 2-month dry season spell resulted in 80–100% seedling mortality. Green-up ofI. spinosaoccurred with 5 mm of rainfall in 4–5 days. Podding of rain-fed and irrigated non-clippedI. spinosawas achieved in 29 and 14 days, respectively, with 31·9 mm of rain.
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DOI: 10.1006/jare.1997.0263
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ISTEX:BB3ADF2BAF6F690C4094CFB14328C71005DD33F5Le document en format XML
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An initial 5 mm watering event triggered seedling emergence ofLeptothrium senegalense(Kunth.) under laboratory conditions. Under field conditions, 24·3 mm and 9·6 mm of rainfall evoked emergence of the grass seedlings in rain-fed and irrigated plots, respectively, while 26·9 mm was necessary to evoke emergence ofIndigofera spinosa(Forsk.). Watering alone did not evoke seedling emergence under field conditions. Seedling emergence was also associated with high relative humidity and low evaporative demand. Results confirmed a staggered seedling emergence pattern in both species. Seedling density was higher forL. senegalensethanI. spinosa, indicating their r/k strategies. Grass seedlings were able to achieve reproductive maturity even under conditions of severe moisture stress (within 34 days) after 31·9 mm of rain.Indigofera spinosaseedlings, however, never attained the reproductive stage. A 2-month dry season spell resulted in 80–100% seedling mortality. Green-up ofI. spinosaoccurred with 5 mm of rainfall in 4–5 days. Podding of rain-fed and irrigated non-clippedI. spinosawas achieved in 29 and 14 days, respectively, with 31·9 mm of rain.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>George A. Keya</name><affiliations><json:string>National Arid Lands Research Centre, P.O. 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An initial 5 mm watering event triggered seedling emergence ofLeptothrium senegalense(Kunth.) under laboratory conditions. Under field conditions, 24·3 mm and 9·6 mm of rainfall evoked emergence of the grass seedlings in rain-fed and irrigated plots, respectively, while 26·9 mm was necessary to evoke emergence ofIndigofera spinosa(Forsk.). Watering alone did not evoke seedling emergence under field conditions. Seedling emergence was also associated with high relative humidity and low evaporative demand. Results confirmed a staggered seedling emergence pattern in both species. Seedling density was higher forL. senegalensethanI. spinosa, indicating their r/k strategies. Grass seedlings were able to achieve reproductive maturity even under conditions of severe moisture stress (within 34 days) after 31·9 mm of rain.Indigofera spinosaseedlings, however, never attained the reproductive stage. A 2-month dry season spell resulted in 80–100% seedling mortality. Green-up ofI. spinosaoccurred with 5 mm of rainfall in 4–5 days. Podding of rain-fed and irrigated non-clippedI. spinosawas achieved in 29 and 14 days, respectively, with 31·9 mm of rain.</abstract><qualityIndicators><score>7.328</score><pdfVersion>1.2</pdfVersion><pdfPageSize>595 x 842 pts (A4)</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>10</keywordCount><abstractCharCount>1387</abstractCharCount><pdfWordCount>6140</pdfWordCount><pdfCharCount>38207</pdfCharCount><pdfPageCount>16</pdfPageCount><abstractWordCount>194</abstractWordCount></qualityIndicators><title>Environmental triggers of germination and phenological events in an arid savannah region of northern Kenya</title><pii><json:string>S0140-1963(97)90263-9</json:string></pii><refBibs><json:item><author><json:item><name>M.H. Andrew</name></json:item><json:item><name>J.J. Mott</name></json:item></author><host><volume>8</volume><pages><last>267</last><first>265</first></pages><author></author><title>Australian Journal of Ecology</title></host><title>Annuals with transient seedbanks: the population biology of indigineous sorghum species of tropical north-west Australia</title></json:item><json:item><host><author></author><title>An analysis of climatological data from Marsabit District of Northern Kenya</title></host></json:item><json:item><author><json:item><name>H.G. Baker</name></json:item></author><host><volume>53</volume><pages><last>1010</last><first>997</first></pages><author></author><title>Ecology</title></host><title>Seed weight in relation to environmental conditions in California</title></json:item><json:item><author><json:item><name>J.K. Baker</name></json:item><json:item><name>A.W. Abdi</name></json:item></author><host><volume>52</volume><pages><last>210</last><first>208</first></pages><author></author><title>East African Agricultural Forestry Journal</title></host><title>The influence of three scarification treatments onIndigofera tinctoria</title></json:item><json:item><author><json:item><name>J. Beatley</name></json:item></author><host><volume>55</volume><pages><last>863</last><first>856</first></pages><author></author><title>Ecology</title></host><title>Phenological events and their environmental triggers in Mojave desert ecosystems</title></json:item><json:item><author><json:item><name>R.L. Benech Arnold</name></json:item><json:item><name>M. Fenner</name></json:item><json:item><name>P.J. Edwards</name></json:item></author><host><volume>6</volume><pages><last>605</last><first>596</first></pages><author></author><title>Functional Ecology</title></host><title>Changes in dormancy levels inSorghum hapelense</title></json:item><json:item><author><json:item><name>C.J. Carren</name></json:item><json:item><name>A.M. Wilson</name></json:item><json:item><name>R.L. Cuany</name></json:item></author><host><volume>40</volume><pages><last>216</last><first>212</first></pages><author></author><title>Journal of Range Management</title></host><title>Caryopsis weight and planting depth of blue gramma. II. Emergence in marginal soil moisture</title></json:item><json:item><author><json:item><name>M.B. Coughenour</name></json:item><json:item><name>J.K. Detling</name></json:item><json:item><name>M.M. Mugambi</name></json:item></author><host><volume>83</volume><pages><last>552</last><first>546</first></pages><author></author><title>Oecologia</title></host><title>Production and nitrogen responses of the African dwarfshrubIndigofera spinosa</title></json:item><json:item><author><json:item><name>P.I. Coyne</name></json:item><json:item><name>J.A. Bradford</name></json:item></author><host><volume>38</volume><pages><last>512</last><first>504</first></pages><author></author><title>Journal of Range Management</title></host><title>Morphology and growth in seedlings of several C4</title></json:item><json:item><author><json:item><name>L. Diara</name></json:item></author><host><volume>31</volume><pages><last>18</last><first>14</first></pages><author></author><title>ILCA Bulletin</title></host><title>Changes inVetiveria nitritianaEragrostis barteri</title></json:item><json:item><author><json:item><name>W.T.H. Elberse</name></json:item><json:item><name>H. Breman</name></json:item></author><host><volume>85</volume><pages><last>40</last><first>32</first></pages><author></author><title>Oecologia</title></host><title>Germination and establishment of Sahelian rangeland species. II. Water availability</title></json:item><json:item><author><json:item><name>W.H.O. Ernst</name></json:item><json:item><name>D.J. Tolsma</name></json:item></author><host><volume>181</volume><pages><last>251</last><first>243</first></pages><author></author><title>Flora</title></host><title>Dormancy and germination of semi-arid annual plant species,Tragus berteronianusTribulus terrestris</title></json:item><json:item><author><json:item><name>W.H.O. Ernst</name></json:item><json:item><name>A.T. Kuiters</name></json:item><json:item><name>D.J. Tolsma</name></json:item></author><host><volume>12</volume><pages><last>739</last><first>729</first></pages><author></author><title>Acta Oecologia</title></host><title>Dormancy of annual and perennial grasses from a savanna of Southeastern Botswana</title></json:item><json:item><author><json:item><name>G.W. Frasier</name></json:item><json:item><name>J.R. Cox</name></json:item><json:item><name>D.A. Woolhiser</name></json:item></author><host><volume>40</volume><pages><last>6</last><first>2</first></pages><author></author><title>Journal of Range Management</title></host><title>Wet-dry cycle effects on warm season grass seedling establishment</title></json:item><json:item><author><json:item><name>B. Hornetz</name></json:item></author><host><author></author><title>Trierer Geographische Studien</title></host><title>Optimierung der Landnutzung im Trockengrenzebereich des Anbaus</title></json:item><json:item><author><json:item><name>B. Hornetz</name></json:item><json:item><name>R. Jätzold</name></json:item><json:item><name>T. Litschko</name></json:item><json:item><name>D. Opp</name></json:item></author><host><author></author><title>Materialien zur Ostafrika-Forschung</title></host><title>Beziehungen zwischen Klima, Weideverhältnissen und Anbaumöglichkeiten in Marginalen Semiariden und Ariden Tropen mit Beispilen aus Nord- und Ost-Kenya</title></json:item><json:item><host><author></author><title>Soil seed-bank of an annual Mediterranean grassland</title></host></json:item><json:item><host><author></author><title>Physiological Plant Ecology</title></host></json:item><json:item><author><json:item><name>G.M. Mckeon</name></json:item><json:item><name>C.W. Rose</name></json:item><json:item><name>J.D. Kalma</name></json:item><json:item><name>B.W.R. Torsell</name></json:item></author><host><volume>10</volume><pages><last>147</last><first>135</first></pages><author></author><title>Australian Journal of Ecology</title></host><title>Pasture seedbed dynamics in a dry monsoonal climate. I. Germination and seedbed environment ofStylosanthes humilisDigitaria ciliaris</title></json:item><json:item><author><json:item><name>S.J. McNaughton</name></json:item></author><host><volume>113</volume><pages><last>703</last><first>691</first></pages><author></author><title>American Naturalist</title></host><title>Grazing as an optimization process: Grass–ungulate relationships in the Serengeti</title></json:item><json:item><author><json:item><name>S.J. McNaughton</name></json:item></author><host><volume>40</volume><pages><last>336</last><first>329</first></pages><author></author><title>Oikos</title></host><title>Compensatory plant growth as a response to herbivory</title></json:item><json:item><author><json:item><name>J.J. Mott</name></json:item></author><host><volume>26</volume><pages><last>631</last><first>621</first></pages><author></author><title>Australian Journal of Botany</title></host><title>Dormancy and germination in five native grass species from savannah woodland communities of northern territory</title></json:item><json:item><author><json:item><name>D.J. Pratt</name></json:item></author><host><volume>3</volume><pages><last>291</last><first>277</first></pages><author></author><title>Journal of Applied Ecology</title></host><title>Bush control studies in drier areas of Kenya. III. Control ofDisperma</title></json:item><json:item><author><json:item><name>B.J. Quinlivan</name></json:item></author><host><volume>27</volume><pages><first>183</first></pages><author></author><title>Journal of Australian Institute of Agricultural Science</title></host><title>Seed coat impermeability in legumes</title></json:item><json:item><author><json:item><name>C.R. Tischler</name></json:item><json:item><name>P.W. Voigt</name></json:item></author><host><volume>3</volume><pages><last>484</last><first>481</first></pages><author></author><title>Crop Science</title></host><title>Effects of planting depth on vegetative characteristics of 3 forage grasses at 14-days post-emergence</title></json:item><json:item><host><author></author><title>Soils of the Mt. Kulal Marsabit Area</title></host></json:item><json:item><author><json:item><name>E.M. Veenendaal</name></json:item><json:item><name>W.H.O. Ernst</name></json:item><json:item><name>G.S. Modise</name></json:item></author><host><volume>32</volume><pages><last>317</last><first>305</first></pages><author></author><title>Journal of Arid Environments</title></host><title>Effect of seasonal rainfall pattern on seedling emergence and establishment of grasses in a savannah in south-eastern Botswana</title></json:item></refBibs><genre><json:string>research-article</json:string></genre><host><volume>37</volume><pii><json:string>S0140-1963(00)X0048-1</json:string></pii><pages><last>106</last><first>91</first></pages><issn><json:string>0140-1963</json:string></issn><issue>1</issue><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><title>Journal of Arid Environments</title><publicationDate>1997</publicationDate></host><publicationDate>1997</publicationDate><copyrightDate>1997</copyrightDate><doi><json:string>10.1006/jare.1997.0263</json:string></doi><id>BB3ADF2BAF6F690C4094CFB14328C71005DD33F5</id><score>0.090402745</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/BB3ADF2BAF6F690C4094CFB14328C71005DD33F5/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/BB3ADF2BAF6F690C4094CFB14328C71005DD33F5/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/BB3ADF2BAF6F690C4094CFB14328C71005DD33F5/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Environmental triggers of germination and phenological events in an arid savannah region of northern Kenya</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>©1997 Academic Press</p></availability><date>1997</date></publicationStmt><notesStmt><note type="content">Section title: Regular Article</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Environmental triggers of germination and phenological events in an arid savannah region of northern Kenya</title><author xml:id="author-1"><persName><forename type="first">George A.</forename><surname>Keya</surname></persName><note type="biography">Present address: c/o Dr B. Hornetz, Department of Geography and Geosciences, University of Trier, P.O. Box 3825, D-54286, Trier, Germany.</note><affiliation>Present address: c/o Dr B. Hornetz, Department of Geography and Geosciences, University of Trier, P.O. Box 3825, D-54286, Trier, Germany.</affiliation><affiliation>National Arid Lands Research Centre, P.O. Box 147, Marsabit, Kenya</affiliation></author></analytic><monogr><title level="j">Journal of Arid Environments</title><title level="j" type="abbrev">YJARE</title><idno type="pISSN">0140-1963</idno><idno type="PII">S0140-1963(00)X0048-1</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997"></date><biblScope unit="volume">37</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="91">91</biblScope><biblScope unit="page" to="106">106</biblScope></imprint></monogr><idno type="istex">BB3ADF2BAF6F690C4094CFB14328C71005DD33F5</idno><idno type="DOI">10.1006/jare.1997.0263</idno><idno type="PII">S0140-1963(97)90263-9</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1997</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Germination, seedling emergence, growth and phenological patterns of two plant species found in an arid savannah region of Kenya were studied in relation to watering, rainfall and soil moisture under laboratory and field conditions. An initial 5 mm watering event triggered seedling emergence ofLeptothrium senegalense(Kunth.) under laboratory conditions. Under field conditions, 24·3 mm and 9·6 mm of rainfall evoked emergence of the grass seedlings in rain-fed and irrigated plots, respectively, while 26·9 mm was necessary to evoke emergence ofIndigofera spinosa(Forsk.). Watering alone did not evoke seedling emergence under field conditions. Seedling emergence was also associated with high relative humidity and low evaporative demand. Results confirmed a staggered seedling emergence pattern in both species. Seedling density was higher forL. senegalensethanI. spinosa, indicating their r/k strategies. Grass seedlings were able to achieve reproductive maturity even under conditions of severe moisture stress (within 34 days) after 31·9 mm of rain.Indigofera spinosaseedlings, however, never attained the reproductive stage. A 2-month dry season spell resulted in 80–100% seedling mortality. Green-up ofI. spinosaoccurred with 5 mm of rainfall in 4–5 days. Podding of rain-fed and irrigated non-clippedI. spinosawas achieved in 29 and 14 days, respectively, with 31·9 mm of rain.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>Keywords</head><item><term>Kenya</term></item><item><term>arid</term></item><item><term>rainfall</term></item><item><term>grass</term></item><item><term>dwarf shrub</term></item><item><term>germination</term></item><item><term>seedling</term></item><item><term>phenology</term></item><item><term>Leptothrium senegalense</term></item><item><term>Indigofera spinosa</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1997">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/BB3ADF2BAF6F690C4094CFB14328C71005DD33F5/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla" xml:lang="en"><item-info><jid>YJARE</jid><aid>90263</aid><ce:pii>S0140-1963(97)90263-9</ce:pii><ce:doi>10.1006/jare.1997.0263</ce:doi><ce:copyright type="full-transfer" year="1997">Academic Press</ce:copyright></item-info><head><ce:dochead><ce:textfn>Regular Article</ce:textfn></ce:dochead><ce:title>Environmental triggers of germination and phenological events in an arid savannah region of northern Kenya</ce:title><ce:author-group><ce:author><ce:given-name>George A.</ce:given-name><ce:surname>Keya</ce:surname><ce:cross-ref refid="AE970263FN1"><ce:sup>f1</ce:sup><ce:footnote id="AE970263FN1"><ce:label>f1</ce:label><ce:note-para>Present address: c/o Dr B. Hornetz, Department of Geography and Geosciences, University of Trier, P.O. Box 3825, D-54286, Trier, Germany.</ce:note-para></ce:footnote></ce:cross-ref></ce:author><ce:affiliation><ce:textfn>National Arid Lands Research Centre, P.O. Box 147, Marsabit, Kenya</ce:textfn></ce:affiliation></ce:author-group><ce:date-received day="25" month="10" year="1996"></ce:date-received><ce:date-accepted day="18" month="2" year="1997"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Germination, seedling emergence, growth and phenological patterns of two plant species found in an arid savannah region of Kenya were studied in relation to watering, rainfall and soil moisture under laboratory and field conditions. An initial 5 mm watering event triggered seedling emergence of<ce:italic>Leptothrium senegalense</ce:italic>(Kunth.) under laboratory conditions. Under field conditions, 24·3 mm and 9·6 mm of rainfall evoked emergence of the grass seedlings in rain-fed and irrigated plots, respectively, while 26·9 mm was necessary to evoke emergence of<ce:italic>Indigofera spinosa</ce:italic>(Forsk.). Watering alone did not evoke seedling emergence under field conditions. Seedling emergence was also associated with high relative humidity and low evaporative demand. Results confirmed a staggered seedling emergence pattern in both species. Seedling density was higher for<ce:italic>L. senegalense</ce:italic>than<ce:italic>I. spinosa</ce:italic>, indicating their r/k strategies. Grass seedlings were able to achieve reproductive maturity even under conditions of severe moisture stress (within 34 days) after 31·9 mm of rain.<ce:italic>Indigofera spinosa</ce:italic>seedlings, however, never attained the reproductive stage. A 2-month dry season spell resulted in 80–100% seedling mortality. Green-up of<ce:italic>I. spinosa</ce:italic>occurred with 5 mm of rainfall in 4–5 days. Podding of rain-fed and irrigated non-clipped<ce:italic>I. spinosa</ce:italic>was achieved in 29 and 14 days, respectively, with 31·9 mm of rain.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:keywords><ce:section-title>Keywords</ce:section-title><ce:keyword><ce:text>Kenya</ce:text></ce:keyword><ce:keyword><ce:text>arid</ce:text></ce:keyword><ce:keyword><ce:text>rainfall</ce:text></ce:keyword><ce:keyword><ce:text>grass</ce:text></ce:keyword><ce:keyword><ce:text>dwarf shrub</ce:text></ce:keyword><ce:keyword><ce:text>germination</ce:text></ce:keyword><ce:keyword><ce:text>seedling</ce:text></ce:keyword><ce:keyword><ce:text>phenology</ce:text></ce:keyword><ce:keyword><ce:text><ce:italic>Leptothrium senegalense</ce:italic></ce:text></ce:keyword><ce:keyword><ce:text><ce:italic>Indigofera spinosa</ce:italic></ce:text></ce:keyword></ce:keywords></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Environmental triggers of germination and phenological events in an arid savannah region of northern Kenya</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>Environmental triggers of germination and phenological events in an arid savannah region of northern Kenya</title></titleInfo><name type="personal"><namePart type="given">George A.</namePart><namePart type="family">Keya</namePart><affiliation>National Arid Lands Research Centre, P.O. Box 147, Marsabit, Kenya</affiliation><description>Present address: c/o Dr B. Hornetz, Department of Geography and Geosciences, University of Trier, P.O. Box 3825, D-54286, Trier, Germany.</description><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1997</dateIssued><copyrightDate encoding="w3cdtf">1997</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Germination, seedling emergence, growth and phenological patterns of two plant species found in an arid savannah region of Kenya were studied in relation to watering, rainfall and soil moisture under laboratory and field conditions. An initial 5 mm watering event triggered seedling emergence ofLeptothrium senegalense(Kunth.) under laboratory conditions. Under field conditions, 24·3 mm and 9·6 mm of rainfall evoked emergence of the grass seedlings in rain-fed and irrigated plots, respectively, while 26·9 mm was necessary to evoke emergence ofIndigofera spinosa(Forsk.). Watering alone did not evoke seedling emergence under field conditions. Seedling emergence was also associated with high relative humidity and low evaporative demand. Results confirmed a staggered seedling emergence pattern in both species. Seedling density was higher forL. senegalensethanI. spinosa, indicating their r/k strategies. Grass seedlings were able to achieve reproductive maturity even under conditions of severe moisture stress (within 34 days) after 31·9 mm of rain.Indigofera spinosaseedlings, however, never attained the reproductive stage. A 2-month dry season spell resulted in 80–100% seedling mortality. Green-up ofI. spinosaoccurred with 5 mm of rainfall in 4–5 days. Podding of rain-fed and irrigated non-clippedI. spinosawas achieved in 29 and 14 days, respectively, with 31·9 mm of rain.</abstract><note type="content">Section title: Regular Article</note><subject lang="en"><genre>Keywords</genre><topic>Kenya</topic><topic>arid</topic><topic>rainfall</topic><topic>grass</topic><topic>dwarf shrub</topic><topic>germination</topic><topic>seedling</topic><topic>phenology</topic><topic>Leptothrium senegalense</topic><topic>Indigofera spinosa</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Arid Environments</title></titleInfo><titleInfo type="abbreviated"><title>YJARE</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">199709</dateIssued></originInfo><identifier type="ISSN">0140-1963</identifier><identifier type="PII">S0140-1963(00)X0048-1</identifier><part><date>199709</date><detail type="volume"><number>37</number><caption>vol.</caption></detail><detail type="issue"><number>1</number><caption>no.</caption></detail><extent unit="issue pages"><start>1</start><end>191</end></extent><extent unit="pages"><start>91</start><end>106</end></extent></part></relatedItem><identifier type="istex">BB3ADF2BAF6F690C4094CFB14328C71005DD33F5</identifier><identifier type="DOI">10.1006/jare.1997.0263</identifier><identifier type="PII">S0140-1963(97)90263-9</identifier><accessCondition type="use and reproduction" contentType="copyright">©1997 Academic Press</accessCondition><recordInfo><recordContentSource>ELSEVIER</recordContentSource><recordOrigin>Academic Press, ©1997</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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