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• W4221020832 abstract "Abstract Aims Monitoring rangeland above‐ground net primary production (ANPP) requires information on the variation of radiation use efficiency (RUE). We studied the spatial and temporal variations of RUE of the herbaceous layer (RUE H ) in woodlands and shrublands and its association with grazing regime, environmental, and vegetation variables. Location We worked in the Arid Chaco (Argentina), an ecotone region between the Chaco and Monte phytogeographic provinces. Woody and herbaceous species coexist in variable proportions in relation to a regional precipitation gradient and local edaphic variations. Methods and results Over eight growing seasons, we estimated RUE H at 12 sites, each with two contrasting grazing regimes (moderate and severe). To do this, we related estimated ANPP H from biomass harvests and APAR H (absorbed photosynthetically active radiation of the herbaceous layer) calculated from the MODIS normalized difference vegetation index (NDVI). Then we linked the RUE H with precipitation, physiognomy, soil, and landscape data. Most of the spatial variability of RUE H was accounted for by the grazing regime. Moderately grazed areas had a three times greater RUE H than severely grazed ones (0.507 and 0.180 g MJ −1 respectively). They also exhibited different proportions of herbaceous functional types. Physiognomic characteristics of the woody layer explained a significant proportion of the spatial variation of RUE H not explained by grazing regime. RUE H was between 30 and 150% greater in woodlands than in shrublands depending on whether the sites were under moderate or severe grazing respectively. Conclusion Grazing regime and woody physiognomy accounted for most of the variation in herbaceous radiation use efficiency. Our results show that RUE H may be predicted with greater accuracy from a combination of vegetation maps and information on grazing regime. Thus, our models could be incorporated into web platforms that provide ANPP H (forage) monitoring services based on satellite data, in order to improve their estimates in woodlands, shrublands and savanna ecosystems." @default.
• W4221020832 created "2022-04-03" @default.
• W4221020832 creator A5020877648 @default.
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• W4221020832 date "2022-01-01" @default.
• W4221020832 modified "2023-10-07" @default.
• W4221020832 title "Radiation use efficiency of the herbaceous layer of dry Chaco shrublands and woodlands: Spatial and temporal patterns" @default.
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• W4221020832 doi "https://doi.org/10.1111/avsc.12653" @default.
• W4221020832 hasPublicationYear "2022" @default.
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