Academic Journal
Vegetative stage and soil horizon respectively determine direction and magnitude of rhizosphere priming effects in contrasting tree line soils
| العنوان: | Vegetative stage and soil horizon respectively determine direction and magnitude of rhizosphere priming effects in contrasting tree line soils |
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| المؤلفون: | Michel, Jennifer, Fontaine, Sébastien, Revaillot, Sandrine, Picon-Cochard, Catherine, Whitaker, Jeanette |
| المصدر: | Functional Ecology (2024-08-06) |
| بيانات النشر: | Wiley, 2024. |
| سنة النشر: | 2024 |
| مصطلحات موضوعية: | Andean mountains, carbon cycle, climate change, microbial mineralisation, plant-soil feedback, rhizosphere priming effect, soil organic matter, sub arctic, treeline, Life sciences, Environmental sciences & ecology, Physical, chemical, mathematical & earth Sciences, Earth sciences & physical geography, Sciences du vivant, Sciences de l’environnement & écologie, Physique, chimie, mathématiques & sciences de la terre, Sciences de la terre & géographie physique |
| الوصف: | 1. Tree lines in high latitudes and high altitudes are considered sentinels of globalchange. This manifests in accelerated encroachment of trees and shrubs and en-hanced plant productivity, with currently unknown implications for the carbonbalance of these biomes. Given the large soil organic carbon stocks in many treeline soils, we here wondered whether introducing highly productive plants wouldaccelerate carbon cycling through rhizosphere priming effects and if certain soilswould be more vulnerable to carbon loss from positive priming than others.2. To test this, organic and mineral soils were sampled above and below tree linesin the Swedish sub-arctic and the Peruvian Andes. A greenhouse experiment wasthen performed to quantify plant-induced changes in soil mineralisation rates(rhizosphere priming effect) and new C formation using natural abundance label-ling and the C4-species Cynodon dactylon. Several environmental, plant, soil andmicrobial parameter were monitored during the experiment to complement theobservations on soil C cycling.3. Priming was predominantly positive at the beginning of the experiment, then sys-tematically decreased in all soils during the plant growth season to be mostlynegative at the end of the experiment at plant senescence. Independent of direc -tion of priming, the magnitude of priming was always greater in organic than incorresponding mineral soils, which was best explained by the higher C contents ofthese soils. Integrated over the entire study period, the overall impact of priming(positive and negative) on the soil C balance was mostly negligible. Though netsoil C loss was observed in organic soils from the sub-arctic tundra in Sweden.4. Most notably, positive and negative priming effects were not mutually exclu-sive, rather omnipresent across ecosystems, depending on sampling time. Thedirection of priming seems to be fluctuating with plant productivity, rhizospherecarbon inputs and nutrient uptake. This highlights the need for integrative long-term studies if we aim to understand priming effects at ecosystem scale and greenhouse and laboratory studies must be validated in situ to enable reliableecological upscaling. 13. Climate action 15. Life on land |
| نوع الوثيقة: | journal article http://purl.org/coar/resource_type/c_6501 article peer reviewed |
| اللغة: | English |
| Relation: | urn:issn:0269-8463; urn:issn:1365-2435 |
| DOI: | 10.1111/1365-2435.14625 |
| URL الوصول: | https://orbi.uliege.be/handle/2268/321758 |
| Rights: | open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsorb.321758 |
| قاعدة البيانات: | ORBi |
| DOI: | 10.1111/1365-2435.14625 |
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