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SOME ASPECTS OF THE NITROGEN CYCLE IN A CALIFORNIAN STRAND ECOSYSTEM
Booker Holton, Jr., Michael G. Barbour and Scott N. Martens
Vol. 38, No. 3 (JULY-SEPTEMBER 1991), pp. 170-184
Published by: California Botanical Society
Stable URL: http://www.jstor.org/stable/41424858
Page Count: 15
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Nitrogen inputs and storage pools were quantified for 20 months on a perennial grass dominated beach-foredune area at Pt. Reyes National Seashore, CA. Atmospheric input of ammonium and nitrate by bulk precipitation (rain + dry fallout) was 1.6 kg N haɻ¹;1 yr⁻¹ and by summer fog condensation was 4.2 kg N ha⁻¹ yrɻ¹; Non-symbiotic nitrogen fixation was not detected and fixation by a nodulated legume species is negligible relative to atmospheric inputs. The total ecosystem nitrogen pool was only 390 kg ha⁻¹ , 78% of which was soil organic nitrogen, 18% was in vegetation, and 4% was inorganic soil nitrogen. Living vascular plant tissue contained 1.7% nitrogen— a value typical of crop plants on fertile soil— despite soil nitrogen content < 0.006%.
Madroño © 1991 California Botanical Society