Spatial and temporal variation of primary production of Patagonian wet meadows
In extra-Andean Patagonia, wet meadows contrast with the prevailing arid steppes, and present a gradient of water availability from the periphery to the center. The objectives of this paper are to describe the spatial and temporal variation of aerial net primary production [ANPP] of Patagonian meadows, and to obtain a model for the relationship between the normalized difference vegetation index [NDVI] and ANPP. We determined ANPP in four regionally scattered meadows during 3-5 years and in three positions of the gradient of water availability. In one meadow, we correlated ANPP with NDVI during 2 years. Annual ANPP was 2-3 times larger in the center than in the periphery, and also varied 2-3 fold among the four meadows. The interannual variation of ANPP was high and similar across meadows and zones. ANPP was closely correlated with NDVI through a linear model. Within the growing season, the central zone had a more extended period of high NDVI into the summer than the peripheral and the intermediate zones. We conclude that [1] the local variation of ANPP across the gradient of water availability is strong and must be taken into account for management, and [2] the highly variable ANPP may be monitored by remote sensing.
| Main Authors: | , , , |
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| Format: | Texto biblioteca |
| Language: | eng |
| Subjects: | AZONAL COMMUNITIES, INTERANNUAL VARIATION, LANDSCAPE, MALLIN, REMOTE SENSING, SEASONAL VARIATION, ANNUAL VARIATION, GROWING SEASON, LANDSCAPE ECOLOGY, MEADOW, NDVI, NET PRIMARY PRODUCTION, PERIPHERAL REGION, SPATIOTEMPORAL ANALYSIS, WATER AVAILABILITY, PATAGONIA, |
| Online Access: | http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=46495 |
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