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Legacies of precipitation fluctuations on primary production: theory and data synthesis

出版社

ROYAL SOC
DOI: 10.1098/rstb.2011.0347

关键词

primary production; legacies; spatial and temporal models; precipitation effects

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资金

  1. National Science Foundation [DEB 09-17668, DEB 06-18210]
  2. Division Of Environmental Biology
  3. Direct For Biological Sciences [0917668, 1235828] Funding Source: National Science Foundation

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Variability of above-ground net primary production (ANPP) of arid to sub-humid ecosystems displays a closer association with precipitation when considered across space (based on multiyear averages for different locations) than through time (based on year-to-year change at single locations). Here, we propose a theory of controls of ANPP based on four hypotheses about legacies of wet and dry years that explains space versus time differences in ANPP-precipitation relationships. We tested the hypotheses using 16 long-term series of ANPP. We found that legacies revealed by the association of current-versus previous-year conditions through the temporal series occur across all ecosystem types from deserts to mesic grasslands. Therefore, previous-year precipitation and ANPP control a significant fraction of current-year production. We developed unified models for the controls of ANPP through space and time. The relative importance of current-versus previous-year precipitation changes along a gradient of mean annual precipitation with the importance of current-year PPT decreasing, whereas the importance of previous-year PPT remains constant as mean annual precipitation increases. Finally, our results suggest that ANPP will respond to climate-change-driven alterations in water availability and, more importantly, that the magnitude of the response will increase with time.

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