Drought effects on fine-root and ectomycorrhizal-root biomass in managed Pinus oaxacana Mirov stands in Oaxaca, Mexico.
Identifieur interne : 003401 ( Main/Corpus ); précédent : 003400; suivant : 003402Drought effects on fine-root and ectomycorrhizal-root biomass in managed Pinus oaxacana Mirov stands in Oaxaca, Mexico.
Auteurs : María Valdés ; Heidi Asbjornsen ; Martín G Mez-Cárdenas ; Margarita Juárez ; Kristiina A. VogtSource :
- Mycorrhiza [ 0940-6360 ] ; 2006.
English descriptors
- KwdEn :
- MESH :
- growth & development : Mycorrhizae, Pinus, Plant Roots.
- microbiology : Pinus, Plant Roots.
- Biomass, Disasters, Seasons.
Abstract
The effects of a severe drought on fine-root and ectomycorrhizal biomass were investigated in a forest ecosystem dominated by Pinus oaxacana located in Oaxaca, Mexico. Root cores were collected during both the wet and dry seasons of 1998 and 1999 from three sites subjected to different forest management treatments in 1990 and assessed for total fine-root biomass and ectomycorrhizal-root biomass. Additionally, a bioassay experiment with P. oaxacana seedlings was conducted to assess the ectomycorrhizal inoculum potential of the soil for each of the three stands. Results indicated that biomasses of both fine roots and ectomycorrhizal roots were reduced by almost 60% in the drought year compared to the nondrought year. There were no significant differences in ectomycorrhizal and fine-root biomass between the wet and dry seasons. Further, the proportion of total root biomass consisting of ectomycorrhizal roots did not vary between years or seasons. These results suggest that both total fine-root biomass and ectomycorrhizal-root biomass are strongly affected by severe drought in these high-elevation tropical pine forests, and that these responses outweigh seasonal effects. Forest management practices in these tropical pine forests should consider the effects of drought on the capacity of P. oaxacana to maintain sufficient levels of ectomycorrhizae especially when there is a potential for synergistic interactions between multiple disturbances that may lead to more severe stress in the host plant and subsequent reductions in ectomycorrhizal colonization.
DOI: 10.1007/s00572-005-0022-9
PubMed: 16322986
Links to Exploration step
pubmed:16322986Le document en format XML
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<author><name sortKey="Valdes, Maria" sort="Valdes, Maria" uniqKey="Valdes M" first="María" last="Valdés">María Valdés</name>
<affiliation><nlm:affiliation>Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, México, D.F., Mexico.</nlm:affiliation>
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<author><name sortKey="Asbjornsen, Heidi" sort="Asbjornsen, Heidi" uniqKey="Asbjornsen H" first="Heidi" last="Asbjornsen">Heidi Asbjornsen</name>
<affiliation><nlm:affiliation>Department of Natural Resource Ecology and Management, 234 Science II, Iowa State University, Ames, IA, 50011, USA. hasbjorn@iastate.edu.</nlm:affiliation>
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<author><name sortKey="G Mez Cardenas, Martin" sort="G Mez Cardenas, Martin" uniqKey="G Mez Cardenas M" first="Martín" last="G Mez-Cárdenas">Martín G Mez-Cárdenas</name>
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<author><name sortKey="Vogt, Kristiina A" sort="Vogt, Kristiina A" uniqKey="Vogt K" first="Kristiina A" last="Vogt">Kristiina A. Vogt</name>
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<author><name sortKey="G Mez Cardenas, Martin" sort="G Mez Cardenas, Martin" uniqKey="G Mez Cardenas M" first="Martín" last="G Mez-Cárdenas">Martín G Mez-Cárdenas</name>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biomass (MeSH)</term>
<term>Disasters (MeSH)</term>
<term>Mycorrhizae (growth & development)</term>
<term>Pinus (growth & development)</term>
<term>Pinus (microbiology)</term>
<term>Plant Roots (growth & development)</term>
<term>Plant Roots (microbiology)</term>
<term>Seasons (MeSH)</term>
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<term>Pinus</term>
<term>Plant Roots</term>
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<keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Pinus</term>
<term>Plant Roots</term>
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<front><div type="abstract" xml:lang="en">The effects of a severe drought on fine-root and ectomycorrhizal biomass were investigated in a forest ecosystem dominated by Pinus oaxacana located in Oaxaca, Mexico. Root cores were collected during both the wet and dry seasons of 1998 and 1999 from three sites subjected to different forest management treatments in 1990 and assessed for total fine-root biomass and ectomycorrhizal-root biomass. Additionally, a bioassay experiment with P. oaxacana seedlings was conducted to assess the ectomycorrhizal inoculum potential of the soil for each of the three stands. Results indicated that biomasses of both fine roots and ectomycorrhizal roots were reduced by almost 60% in the drought year compared to the nondrought year. There were no significant differences in ectomycorrhizal and fine-root biomass between the wet and dry seasons. Further, the proportion of total root biomass consisting of ectomycorrhizal roots did not vary between years or seasons. These results suggest that both total fine-root biomass and ectomycorrhizal-root biomass are strongly affected by severe drought in these high-elevation tropical pine forests, and that these responses outweigh seasonal effects. Forest management practices in these tropical pine forests should consider the effects of drought on the capacity of P. oaxacana to maintain sufficient levels of ectomycorrhizae especially when there is a potential for synergistic interactions between multiple disturbances that may lead to more severe stress in the host plant and subsequent reductions in ectomycorrhizal colonization.</div>
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<Abstract><AbstractText>The effects of a severe drought on fine-root and ectomycorrhizal biomass were investigated in a forest ecosystem dominated by Pinus oaxacana located in Oaxaca, Mexico. Root cores were collected during both the wet and dry seasons of 1998 and 1999 from three sites subjected to different forest management treatments in 1990 and assessed for total fine-root biomass and ectomycorrhizal-root biomass. Additionally, a bioassay experiment with P. oaxacana seedlings was conducted to assess the ectomycorrhizal inoculum potential of the soil for each of the three stands. Results indicated that biomasses of both fine roots and ectomycorrhizal roots were reduced by almost 60% in the drought year compared to the nondrought year. There were no significant differences in ectomycorrhizal and fine-root biomass between the wet and dry seasons. Further, the proportion of total root biomass consisting of ectomycorrhizal roots did not vary between years or seasons. These results suggest that both total fine-root biomass and ectomycorrhizal-root biomass are strongly affected by severe drought in these high-elevation tropical pine forests, and that these responses outweigh seasonal effects. Forest management practices in these tropical pine forests should consider the effects of drought on the capacity of P. oaxacana to maintain sufficient levels of ectomycorrhizae especially when there is a potential for synergistic interactions between multiple disturbances that may lead to more severe stress in the host plant and subsequent reductions in ectomycorrhizal colonization.</AbstractText>
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