Ambient precipitation determines the sensitivity of soil respiration to precipitation treatments in a marsh

• DOI: 10.1111/gcb.16581
• Publication Date: 2023-01-04T08:20:56Z
• Authors: Xinge Li; Yalin Hou; Xiaojing Chu; Mingliang Zhao; Siyu Wei; Weimin Song; Peiguang Li; Xiaojie Wang; Guangxuan Han
• Keywords: Terrestrial ecosystem

The effects in field manipulation experiments are strongly influenced by amplified interannual variation ambient climate as the experimental duration increases. Soil respiration (SR), an important part of carbon cycle terrestrial ecosystems, is sensitive to changes such temperature and precipitation changes. A growing body evidence has indicated that affects sensitivity SR, which benchmarks strength soil carbon-climate feedbacks. However, whether SR still not clear. In addition, mechanism driving above phenomenon poorly understood. Here, a long-term experiment with five treatments (-60%, -40%, +0%, +40%, +60% annual precipitation) was conducted marsh Yellow River Delta, China, drying-wetting caused Results showed increased exponentially along gradient each year (standardized per 100 mm change under treatments) exhibited significant from 2016 2021. temperature, net radiation, all dramatic variability; however, only had negative correlation sensitivity. Moreover, significantly positively related belowground biomass (BGB) across 6 years. Structural equation modeling regression analysis also affected its autotrophic heterotrophic components altering BGB. Our study demonstrated determines marshes. findings underscore importance regulating ecosystem responses experiments.