Ecosystem CO2 exchange

Wu, Zhuoting and Hungate, Bruce A and Heinrich, Paul L (2009) Ecosystem CO2 exchange. [Dataset]

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Abstract

Global temperature increases and precipitation changes are both expected to alter ecosystem carbon (C) cycling. We tested responses of ecosystem C cycling to simulated climate change using field manipulations of temperature and precipitation across a range of grass-dominated ecosystems along an elevation gradient in northern Arizona. In 2002, we transplanted intact plant-soil mesocosms to simulate warming and used passive interceptors and collectors to manipulate precipitation. We measured daytime ecosystem respiration and net ecosystem C exchange throughout the growing season in 2008 and 2009. Warming generally stimulated ecosystem respiration and photosynthesis, but had variable effects on daytime net C exchange. Increased precipitation stimulated ecosystem C cycling only in the driest ecosystem at the lowest elevation, while decreased precipitation showed no effects on ecosystem C cycling across all ecosystems. No significant interaction between temperature and precipitation treatments was observed. Our findings suggest that warming exerted the strongest influence on ecosystem C cycling in both years, by modulating soil moisture in the wet year and soil temperature in the dry year.

Item Type:	Dataset
Publisher’s Statement:	Creative Commons CC BY-NC-SA
Keywords:	Gross ecosystem photosynthesis, ecosystem respiration, net ecosystem exchange
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences
NAU Depositing Author Academic Status:	Faculty/Staff
Department/Unit:	College of Engineering, Forestry, and Natural Science > Biological Sciences Research Centers > Merriam-Powell Center for Environmental Research
Date Deposited:	22 Dec 2015 19:14
URI:	http://openknowledge.nau.edu/id/eprint/2253

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