Non-additive effect of day and night warming on soil respiration in a temperate steppe

Abstract

Abstract. This study was conducted to examine potentially differential effects of day and night warming on soil respiration in a temperate steppe in northern China. A full factorial design with day and night warming was used in this study, including control (C), day (6 a.m.–6 p.m., local time; D) warming, night (6 p.m.–6 a.m.; N) warming, and diurnal warming (W). Day warming showed neutral effect on soil respiration, whereas night warming significantly increased soil respiration by 7.1% over the first 3 growing seasons. The insignificant effect of day warming on soil respiration could be attributable to the offset of the direct positive effects by the indirect negative effects via aggravating water limitation and suppressing ecosystem C assimilation. The positive effects of night warming on soil respiration were largely due to the stimulation of ecosystem C uptake and substrate supply via over-compensation of plant photosynthesis. In addition, day and night warming showed antagonistic effects on soil respiration, which could be ascribed to their contrasting effects on ecosystem C assimilation. The results suggest differential and non-additive effects of day and night warming on soil respiration, which was driven by the treatment-induced changes in substrate supply.

Testing DNDC model for simulating soil respiration and assessing the effects of climate change on the CO2 gas flux from Irish agriculture

“…plant growth and substrate supply and abiotic factors i.e. temperature and moisture Xia et al, 2009). As discussed earlier, temperature is one of the main driving factors affecting CO 2 -C efflux from soils (e.g.…”

Specificity Responses of Grasshoppers in Temperate Grasslands to Diel Asymmetric Warming

“…Climate warming has been found to directly affect growth, metabolic and developmental processes in many plant, microorganism, and animal species. A diel asymmetric warming has been found to impose differential effects on plant production, soil microclimate, and soil CO 2 emissions [2] , [5] , [7] , [10] , [13] . Recent studies show that day, night and continuous warming had different effects on longevity of plant roots and soil microbial composition in Inner Mongolian grasslands [14] , [15] .…”

Comparison of the effects of symmetric and asymmetric temperature elevation and CO2 enrichment on yield and evapotranspiration of winter wheat (Triticum aestivum L.)

“…In general, the physiological and ecological activities of prime importance for yield and water use of crops (i.e., photosynthesis, respiration, and transpiration) occurred mainly during daytime excluding respiration in night (Xia et al. ). Higher elevation of temperature during nighttime might increase respiration losses of photoassimilates (Abou‐Hussein ) and decrease crop yield compared with symmetric warming in daytime and nighttime (Lobell et al.…”

“…To date, only few studies have addressed the response of wheat to higher night warming without daytime warming (Rosenzweig and Tubiello 1996 ; Dhakhwa and Campbell 1998 ; Lobell 2007 ; Lobell and Ortiz-Monasterio 2007 ; Prasad et al 2008 ; Fang et al 2012 ). In general, the physiological and ecological activities of prime importance for yield and water use of crops (i.e., photosynthesis, respiration, and transpiration) occurred mainly during daytime excluding respiration in night (Xia et al 2009 ). Higher elevation of temperature during nighttime might increase respiration losses of photoassimilates (Abou-Hussein 2012 ) and decrease crop yield compared with symmetric warming in daytime and nighttime (Lobell et al 2011 ).…”