Water‐mediated responses of ecosystem carbon fluxes to climatic change in a temperate steppe
Open Access
- 18 October 2007
- journal article
- Published by Wiley in New Phytologist
- Vol. 177 (1), 209-219
- https://doi.org/10.1111/j.1469-8137.2007.02237.x
Abstract
Global warming and a changing precipitation regime could have a profound impact on ecosystem carbon fluxes, especially in arid and semiarid grasslands where water is limited. A field experiment manipulating temperature and precipitation has been conducted in a temperate steppe in northern China since 2005. A paired, nested experimental design was used, with increased precipitation as the primary factor and warming simulated by infrared radiators as the secondary factor. The results for the first 2 yr showed that gross ecosystem productivity (GEP) was higher than ecosystem respiration, leading to net C sink (measured by net ecosystem CO(2) exchange, NEE) over the growing season in the study site. The interannual variation of NEE resulted from the difference in mean annual precipitation. Experimental warming reduced GEP and NEE, whereas increased precipitation stimulated ecosystem C and water fluxes in both years. Increased precipitation also alleviated the negative effect of experimental warming on NEE. The results demonstrate that water availability plays a dominant role in regulating ecosystem C and water fluxes and their responses to climatic change in the temperate steppe of northern China.Keywords
This publication has 48 references indexed in Scilit:
- Leaf‐ and stand‐level responses of a forested mesocosm to independent manipulations of temperature and vapor pressure deficitNew Phytologist, 2007
- Effects of an increase in summer precipitation on leaf, soil, and ecosystem fluxes of CO2 and H2O in a sotol grassland in Big Bend National Park, TexasOecologia, 2006
- Direct and indirect effects of experimental warming on ecosystem carbon processes in a tallgrass prairieGlobal Biogeochemical Cycles, 2005
- Daily precipitation changes in the semi-arid region over northern ChinaJournal of Arid Environments, 2004
- Response of net ecosystem gas exchange to a simulated precipitation pulse in a semi-arid grassland: the role of native versus non-native grasses and soil textureOecologia, 2003
- Interactions between Carbon and Nitrogen Mineralization and Soil Organic Matter Chemistry in Arctic Tundra SoilsEcosystems, 2003
- Stomatal and photosynthetic responses of olive (Olea europaea L.) leaves to water deficitsPlant, Cell & Environment, 2002
- A meta-analysis of the response of soil respiration, net nitrogen mineralization, and aboveground plant growth to experimental ecosystem warmingOecologia, 2001
- Environmental controls on soil respiration in the Eurasian and Greenlandic ArcticJournal of Geophysical Research: Solid Earth, 1998
- The potential response of global terrestrial carbon storage to a climate changeWater, Air, & Soil Pollution, 1993