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CO₂ exchange and biomass development of the herbaceous vegetation in the Portuguese montado ecosystem during spring

Title data

Hussain, Mir Zaman ; Otieno, Dennis Ochuodho ; Mirzaee, Haidar ; Li, Y. L. ; Schmidt, Markus ; Siebicke, Lukas ; Foken, Thomas ; Ribeiro, N. A. ; Pereira, João Santos ; Tenhunen, John:
CO₂ exchange and biomass development of the herbaceous vegetation in the Portuguese montado ecosystem during spring.
In: Agriculture, Ecosystems & Environment. Vol. 132 (July 2009) Issue 1/2 . - pp. 143-152.
ISSN 0167-8809
DOI: https://doi.org/10.1016/j.agee.2009.03.008

Abstract in another language

Montado are spatially heterogeneous ecosystems that are economically important for the production of cork and herbaceous biomass that provide fodder for animals. Understanding of how trees and the herbaceous layer interact to determine pasture yield and the overall CO2 exchange of the herbaceous layer is crucial. Portable chamberswere used to study CO2 exchange by the herbaceous layer component of the montado ecosystem in southern Portugal. Biomass, Net herbaceous layer CO2 exchange (NEE) andrespiration (Reco) were measured in the open and understory locations between March and May, during the active growing period. Parameter fits on the NEE data were performed using empirical hyperbolic light response model, while ecosystem respiration (Reco) data were fitted with a two-parameter exponential model. Annual green biomass productions were 405.8 9.0 and 250.6 6.3 g m2 in the open and the understory, respectively. The respective maximum NEE during the day were 24.0 2.9 and9.6 2.2 mmol m2 s1 while maximum Reco were 20.6 2.2 and 10.0 1.6 mmol m2 s1, occurring in April. Photosynthetic photon flux density (PPFD) explained more that 70% of variations in daytime NEE whilesoil temperature at 10 cm depth (Tsoil) explained >50% of the variations in Reco under non-limiting soil moisture conditions. Both the herbaceous layer communities shared similar plant functional types and nosignificant difference in nutrient nitrogen (N) occurred between them. The two herbaceous layer components shared similar physiological characteristics and differences that arose in their CO2 uptake capacities and green biomass production were the result of microclimatic differences created by tree shading.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER82757
BAYCEER90521
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Professor Micrometeorology - Univ.-Prof. Dr. Thomas Foken
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 21 Aug 2015 06:49
Last Modified: 13 May 2020 08:11
URI: https://eref.uni-bayreuth.de/id/eprint/18434