A cross‐biome synthesis of soil respiration and its determinants under simulated precipitation changes

• DOI: 10.1111/gcb.13156
• Publication Date: 2015-11-11T06:20:41Z
• Authors: Lingli Liu; Xin Wang; Marc J. Lajeunesse; Guofang Miao; Shilong Piao; Shiqiang Wan; Yuxin Wu; Zhenhua Wang; Sen Yang; Ping Li; Meifeng Deng
• Keywords: Biome; Soil respiration

Abstract Soil respiration ( R s ) is the second‐largest terrestrial carbon (C) flux. Although has been extensively studied across a broad range of biomes, there surprisingly little consensus on how spatiotemporal patterns will be altered in warming climate with changing precipitation regimes. Here, we present global synthesis data from studies that have manipulated field by collating 113 increased treatments, 91 decreased and 14 prolonged drought treatments. Our meta‐analysis indicated when treatments were normalized to 28% above ambient level, soil moisture, s, temperature sensitivity Q 10 values an average 17%, 16%, 6%, respectively, −1.3%. The greatest increases observed arid areas, stimulation rates humidity. When below moisture −14% −17%, not altered. reductions tended greater more humid areas. Prolonged without alterations amount reduced −12% −6%, but did alter . Overall, our suggests tend sensitive areas responsive responses predominantly driven precipitation‐induced changes whereas had limited impacts. Finally, experiments also emphasizes importance timing frequency events ecosystem C cycles. Given these findings, urge future focus manipulating frequency, intensity, seasonality aim improving ability predict model feedback between change.