Grazing Abandonment Delays the Effect of Temperature on Aboveground Net Primary Production in Atlantic Grasslands

0510384 - MBÚ 2020 RIV US eng J - Journal Article
Aldezabal, A. - Odriozola Larranga, Inaki - Garcia-Baquero, G.
Grazing Abandonment Delays the Effect of Temperature on Aboveground Net Primary Production in Atlantic Grasslands.
Rangeland Ecology & Management. Roč. 72, č. 5 (2019), s. 822-831. ISSN 1550-7424. E-ISSN 1551-5028
Institutional support: RVO:61388971
Keywords : Aralar Natural Park * dynamic regression * mean monthly air temperature
OECD category: Microbiology
Impact factor: 2.095, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/abs/pii/S1550742418302768?via%3Dihub

We used an Atlantic grassland system on the Iberian Peninsula to ascertain whether monthly climate variability explains variation in monthly aboveground net primary production (ANPP) and to test whether climate-ANPP relationships depend on grazing regime. In 2005, large herbivores (beef cattle, dairy sheep, and horses) were excluded through fencing three 2 500-m(2) plots, each located in a different location, adjacent grazed plots of equal size were established. ANPP was measured monthly during the next three growing periods (2006-2008), and locally measured climate data were obtained from a public database. Because between-site variation in annual ANPP was not significant, we used data averaged across sites to test for the effect of monthly climate variability on monthly ANPP by means of dynamic regression. Enhanced ANPP was found after grazing abandonment, probably due to the sudden dominance of productive graminoids. Variation in monthly rainfall did not contribute to explain monthly ANPP under grazing or grazing exclusion. Simultaneous mean monthly air temperature explained monthly ANPP under grazing. By contrast, the effect of temperature on ANPP under grazing exclusion was delayed by 1 mo. We suggest that this delay can be explained by the development of a thick organic layer (litter) that insulated the soil in the grazing exclusion plots. However, changes in floristic composition and, consequently, in phenology might also have contributed to the differential response.
Permanent Link: http://hdl.handle.net/11104/0300895