Nitrogen and Phosphorus Release from Decomposing Leaves under Sub‐Humid Tropical Conditions
Identifieur interne : 003194 ( Main/Exploration ); précédent : 003193; suivant : 003195Nitrogen and Phosphorus Release from Decomposing Leaves under Sub‐Humid Tropical Conditions
Auteurs : A. B. Kwabiah [Canada] ; N. C. Stoskopf [Canada] ; R. P. Voroney [Canada] ; C. A. Palm [Kenya]Source :
- Biotropica [ 0006-3606 ] ; 2001-06.
Descripteurs français
- Wicri :
- geographic : Kenya.
English descriptors
- KwdEn :
Abstract
For many soils of the tropics, inputs of organic materials are essential to sustain soil fertility and crop production. Research in the quality of organic inputs, a key factor controlling rates of decomposition and nutrient release, continues to guide selection and use of organic materials as nutrient sources. The relationship between decomposition patterns and the quality parameters of the fresh leaves of six agroforestry species: Sesbania sesban, Croton megalocarpus, Calliandra calothyrsus, Tithonia diversifolia, Lantana camara, and Senna spectabilis, was investigated in a litterbag study over a period of 77 days in the highlands of western Kenya. The litterbags were buried 1 cm below the soil surface and covered with soil of ca 1 cm thickness. Percent leaf mass and total N and P that remained with time strongly correlated with total P and C/P ratio (R2= 0.60‐0.90) during the first 35 days of study; but afterwards, correlation was stronger with the initial soluble polyphenolics (Pp)/P ratio (R2= 0.69‐0.92) than with total P and C/P ratio. Loss of leaf mass and release of N and P followed the exponential function, yt= y0* e‐kt, from which the specific decay rate constants (k) were calculated for loss of leaf mass (kB) and release of N (kN) and P (Kp). Among the plant species, the k values were lowest in Calliandra with kB= 0.012/d, kN= 0.017/d and kp= 0.044/d. Lantana had the highest K values with kg= 0.067/d and kp= 0.119/d, but the highest kN value of 0.109/d occurred in Tithonia. The kB values for all organic materials were lower than their corresponding kN and kp values, suggesting that leaching of N and P from litters may have augmented the microbial mineralization of N and P. There was a strong correlation between the kB, kN, and kp values and total P (r = 0.82‐0.96; P 0.01), but not total N, lignin (LIG), or Pp. Rates of N and P release followed the general trend: Tithonia > Senna > Lantana > Sesbania > Croton > Calliandra. The results indicated that, among the quality parameters studied, total P is the most important factor controlling rate of decomposition and N and P release from organic inputs in the area of study.
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DOI: 10.1111/j.1744-7429.2001.tb00174.x
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B." last="Kwabiah">A. B. Kwabiah</name><affiliation wicri:level="1"><country>Canada</country><wicri:regionArea>Crop Science Division, Department of Plant Agriculture, University of Guelph, Guelph, Ontario</wicri:regionArea><wicri:noRegion>Ontario</wicri:noRegion></affiliation></author><author><name sortKey="Stoskopf, N C" sort="Stoskopf, N C" uniqKey="Stoskopf N" first="N. C." last="Stoskopf">N. C. Stoskopf</name><affiliation wicri:level="1"><country>Canada</country><wicri:regionArea>Crop Science Division, Department of Plant Agriculture, University of Guelph, Guelph, Ontario</wicri:regionArea><wicri:noRegion>Ontario</wicri:noRegion></affiliation></author><author><name sortKey="Voroney, R P" sort="Voroney, R P" uniqKey="Voroney R" first="R. P." last="Voroney">R. P. Voroney</name><affiliation wicri:level="1"><country>Canada</country><wicri:regionArea>Land Resource Science, University of Guelph, Guelph, Ontario</wicri:regionArea><wicri:noRegion>Ontario</wicri:noRegion></affiliation><affiliation></affiliation></author><author><name sortKey="Palm, C A" sort="Palm, C A" uniqKey="Palm C" first="C. A." last="Palm">C. A. Palm</name><affiliation wicri:level="1"><country xml:lang="fr">Kenya</country><wicri:regionArea>Tropical Soil Biology and Fertility Program, P.O. Box 30592, Nairobi</wicri:regionArea><wicri:noRegion>Nairobi</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Biotropica</title><idno type="ISSN">0006-3606</idno><idno type="eISSN">1744-7429</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2001-06">2001-06</date><biblScope unit="volume">33</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="229">229</biblScope><biblScope unit="page" to="240">240</biblScope></imprint><idno type="ISSN">0006-3606</idno></series><idno type="istex">055A7317C81807F12BC0EEDB6C648228B2C01BEE</idno><idno type="DOI">10.1111/j.1744-7429.2001.tb00174.x</idno><idno type="ArticleID">BTP229</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0006-3606</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Croton megalocarpus</term><term>Kenya</term><term>Key words: Calliandra calothyrsus</term><term>Lantana camara</term><term>Senna spectabilis</term><term>Sesbania sesban</term><term>Tithonia diversifolia.</term><term>decomposition rate</term><term>nutrient release</term><term>residue quality</term><term>subhumid tropics</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Kenya</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">For many soils of the tropics, inputs of organic materials are essential to sustain soil fertility and crop production. Research in the quality of organic inputs, a key factor controlling rates of decomposition and nutrient release, continues to guide selection and use of organic materials as nutrient sources. The relationship between decomposition patterns and the quality parameters of the fresh leaves of six agroforestry species: Sesbania sesban, Croton megalocarpus, Calliandra calothyrsus, Tithonia diversifolia, Lantana camara, and Senna spectabilis, was investigated in a litterbag study over a period of 77 days in the highlands of western Kenya. The litterbags were buried 1 cm below the soil surface and covered with soil of ca 1 cm thickness. Percent leaf mass and total N and P that remained with time strongly correlated with total P and C/P ratio (R2= 0.60‐0.90) during the first 35 days of study; but afterwards, correlation was stronger with the initial soluble polyphenolics (Pp)/P ratio (R2= 0.69‐0.92) than with total P and C/P ratio. Loss of leaf mass and release of N and P followed the exponential function, yt= y0* e‐kt, from which the specific decay rate constants (k) were calculated for loss of leaf mass (kB) and release of N (kN) and P (Kp). Among the plant species, the k values were lowest in Calliandra with kB= 0.012/d, kN= 0.017/d and kp= 0.044/d. Lantana had the highest K values with kg= 0.067/d and kp= 0.119/d, but the highest kN value of 0.109/d occurred in Tithonia. The kB values for all organic materials were lower than their corresponding kN and kp values, suggesting that leaching of N and P from litters may have augmented the microbial mineralization of N and P. There was a strong correlation between the kB, kN, and kp values and total P (r = 0.82‐0.96; P 0.01), but not total N, lignin (LIG), or Pp. Rates of N and P release followed the general trend: Tithonia > Senna > Lantana > Sesbania > Croton > Calliandra. The results indicated that, among the quality parameters studied, total P is the most important factor controlling rate of decomposition and N and P release from organic inputs in the area of study.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Kenya</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Kwabiah, A B" sort="Kwabiah, A B" uniqKey="Kwabiah A" first="A. B." last="Kwabiah">A. B. Kwabiah</name></noRegion><name sortKey="Stoskopf, N C" sort="Stoskopf, N C" uniqKey="Stoskopf N" first="N. C." last="Stoskopf">N. C. Stoskopf</name><name sortKey="Voroney, R P" sort="Voroney, R P" uniqKey="Voroney R" first="R. P." last="Voroney">R. P. Voroney</name></country><country name="Kenya"><noRegion><name sortKey="Palm, C A" sort="Palm, C A" uniqKey="Palm C" first="C. A." last="Palm">C. A. Palm</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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