Grassland establishment under varying resource availability: a test of positive and negative feedback

Ecology
S G Baer, J M Blair

Abstract

The traditional logic of carbon (C) and nitrogen (N) interactions in ecosystems predicts further increases or decreases in productivity (positive feedback) in response to high and low fertility in the soil, respectively; but the potential for development of feedback in ecosystems recovering from disturbance is less well understood. Furthermore, this logic has been challenged in grassland ecosystems where frequent fires or grazing may reduce the contribution of aboveground litter inputs to soil organic matter pools and nutrient supply for plant growth, relative to forest ecosystems. Further, if increases in plant productivity increase soil C content more than soil N content, negative feedback may result from increased microbial demand for N making less available for plant growth. We used a field experiment to test for feedback in an establishing grassland by comparing aboveground net primary productivity (ANPP) and belowground pools and fluxes of C and N in soil with enriched, ambient, and reduced N availability. For eight years annual N enrichment increased ANPP, root N, and root tissue quality, but root C:N ratios remained well above the threshold for net mineralization of N. There was no evidence that N enrichment increased r...Continue Reading

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Citations

Nov 23, 2011·Environmental Management·Elizabeth M BachJohan Six
Jan 27, 2019·Ecological Applications : a Publication of the Ecological Society of America·Kathryn M Docherty, Jessica L M Gutknecht
Oct 7, 2019·Ecological Applications : a Publication of the Ecological Society of America·Sara G BaerScott L Collins
Dec 29, 2020·PloS One·Gary E Belovsky, Jennifer B Slade

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