Skip to main content

Simulated global changes alter phosphorus demand in annual grassland

Buy Article:

$51.00 plus tax (Refund Policy)

Abstract:

Abstract

In the Jasper Ridge Global Change Experiment – an annual grassland with elevated carbon dioxide (CO2), nitrate deposition, temperature, and precipitation – we used six indices of phosphorus (P) limitation to test the hypothesis that global changes that increase net primary production (NPP) increase P demand or limitation. All indices indicated that nitrate deposition, the only factor that stimulated NPP, increased P demand or limitation: (1) soil phosphatase activity increased by 14%; (2) P concentration in green and (3) senescent leaves of the dominant grass genus, Avena, dropped by 40% and 44%, respectively; (4) N : P ratios in green and (5) senescent Avena widened by 99% and 161%, respectively; and (6) total aboveground plant P decreased by 17% with elevated nitrate deposition. The other three factors, which did not stimulate NPP, did not increase P demand: based on two indices, enhanced precipitation decreased P demand (11% decrease in phosphatase activity, 19% increase in total aboveground P), and there was no evidence that elevated CO2 or temperature altered P demand. In a meta-analysis to assess the generality of P constraints on growth increases from global change factors, we found that six of 11 N-limited ecosystems responded to N deposition with enhanced P limitation or demand, but did not detect significant effects of elevated CO2 or warming.

Keywords: Avena barbata; Avena fatua; CO2; Jasper Ridge; N : P ratio; climate change; global change; grassland; nitrogen deposition; nitrogen saturation; phosphatase; phosphorus

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1365-2486.2007.01456.x

Affiliations: 1: Earth Systems Program, Stanford University, Stanford, CA 94305, USA, 2: Department of Global Ecology, Carnegie Institution of Washington, Stanford, CA 94305, USA

Publication date: 2007-12-01

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more