Please wait, while we are loading the content...
Please wait, while we are loading the content...
| Content Provider | Springer Nature Link |
|---|---|
| Author | Kilic, Duygu Kutbay, Hamdi Güray Ozbucak, Tuğba Huseyinova, Rena |
| Copyright Year | 2010 |
| Abstract | • The resorption of nutrients (mainly N and P) from senescing leaves may be a key component of adaptive mechanisms that conserve scarce nutrients. Resorption may be expressed in two ways as resorption efficiency (RE) which is the ratio of the resorbed amounts of nutrient losses during leaf senescence in relation to its prior amount deposited in leaves and resorption proficiency (RP) is the level to which nutrient concentration per unit leaf mass is reduced in senescent leaves. • There is still much debate whether or not different life-forms (i.e. deciduous and evergreen species) show different foliar resorption patterns. Two sympatric species, namely Quercus petraea (Mattuschka) Liebl. subsp. iberica (Steven ex Bieb.) Krassiln. (deciduous) and Arbutus andrachne L. (evergreen) along an elevational gradient were compared with each other to determine whether or not nitrogen and phosphorus resorption efficiency and proficiency varies along the elevational gradient and which leaf parameters were as related to RE and RP. • NRE was found to be rather low in Q. petraea subsp. iberica compared to other deciduous species. Similarly, PRE in A. andrachne was rather low compared to other evergreen species. Mean residence time (MRT) measures how long a unit of nitrogen (MRTN) and phosphorus (MRTP) is present in the plant. MRTN and MRTP were found to be considerably higher in A. andrachne compared to Q. petraea subsp. iberica. In both species, the foliar N/P ratio was below 14 along the elevational gradient and, according to this threshold value, N-limitation occurred in the study area. Although both species in the present study show incomplete resorption deciduous species was more proficient as compared to evergreen one due to low N and P concentrations in senescent leaves. Based on the significant correlations (p < 0.05 and 0.01) between MRT and foliar resorption, it can be concluded that MRT could interfere with the mechanisms controlling nutrient resorption. • La résorption des éléments nutritifs (essentiellement N et P) par sénescence des feuilles peut être une composante clé des mécanismes d’adaptation qui permettent de conserver les rares éléments nutritifs. La résorption peut être exprimée de deux façons : l’efficience de résorption (RE) qui est le rapport entre la quantité résorbée des pertes d’éléments nutritifs au cours de la sénescence des feuilles par rapport à son montant déposé auparavant dans les feuilles et la capacité de résorption (RP) qui est le niveau auquel la concentration des éléments nutritifs par unité de masse de feuilles est réduite dans les feuilles sénescentes. • Il reste encore beaucoup de débat pour déterminer si les différentes formes de vie (c’est-à-dire les espèces décidues et les espèces sempervirentes) présentent différents modes de résorption foliaire. Deux espèces sympatriques, à savoir Quercus petraea (Mattuschka) Liebl. subsp. iberica (Steven ex Bieb.) Krassiln. (décidue) et Arbutus andrachne L. (sempervirente), ont été comparées l’une à l’autre, le long d’un gradient altitudinal, afin de déterminer si l’efficience de résorption de l’azote et du phosphore et la capacité de résorption varient le long d’un gradient altitudinal et quels paramètres de la feuille sont liés à RE et RP. • NRE a été trouvé plutôt faible chez Q. petraea subsp. iberica par rapport à d’autres espèces décidues. De même, chez A. andrachne PRE a été plutôt faible par rapport à d’autres espèces sempervirentes. Le temps de résidence moyen (MRT) mesure combien de temps une unité d’azote (MRTP) et de phosphore (MRTP) est présente dans la plante. MRTP et MRTP étaient considérablement plus élevés chez A. andrachne par rapport à Q. petraea subsp. iberica. Chez les deux espèces, le ratio foliaire N/P était inférieur à 14 le long du gradient altitudinal, en fonction de la valeur de ce seuil, une limitation d’azote s’est produite dans la zone d’étude. Bien que les deux espèces, dans la présente étude, montrent une résorption incomplète, l’espèce décidue avait une meilleure capacité de résorption comparativement à l’espèce sempervirente en raison de la faible concentration de N et de P dans les feuilles sénescentes. Sur la base des corrélations significatives (p < 0.05 et 0.01) entre MRT et la résorption foliaire, il peut être conclu que MRT pourrait interférer avec les mécanismes de contrôle de la résorption des éléments nutritifs. |
| Starting Page | 213 |
| Ending Page | 213 |
| Page Count | 1 |
| File Format | |
| ISSN | 12864560 |
| Journal | Annals of Forest Science |
| Volume Number | 67 |
| Issue Number | 2 |
| e-ISSN | 1297966X |
| Language | French |
| Publisher | Springer Netherlands |
| Publisher Date | 2010-01-01 |
| Publisher Institution | Institut National de la Recherche Agronomique (INRA) |
| Publisher Place | Dordrecht |
| Access Restriction | Subscribed |
| Subject Keyword | stratégies de Grime temps moyenne de résidence (MRT) rapport N/P efficience de la résorption capacité de résorption espèces sympatriques Forestry Wood Science & Technology Forestry Management Tree Biology Environment |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Forestry |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|