Soil respiration in seven types of temperate forests exhibits similar temperature sensitivity

Abstract

Purpose The aim of the study was to compare the temperature sensitivity of soil respiration rate in two soil horizons of seven types of temperate forests. Materials and methods Soil samples were collected in O and A horizons in seven types of temperate forests, each one represented by five independent stands distributed throughout Poland. Soil respiration rates were measured at standard moisture in five temperatures (4 °C, 10 °C, 16 °C, 22 °C and 28 °C), and the first-order Q10 values were calculated for each stand. General linear models (GLM) were fitted for respiration rate and for Q10 values separately using selected soil physical-chemical properties: C:N ratio, dissolved organic carbon (DOC) content and soil pH. Results and discussion The soil respiration rate increased with temperature was the highest in O horizon of fresh mixed forest dominated by hornbeam and increased with C:N ratio, DOC content and soil pH (model p < 0.0001). In turn, model for Q10 was not significant meaning none of tested variables affected soil temperature sensitivity (p = 0.2886). Conclusions Despite studied forest types exhibit substantial distinctness in many soil properties including respiration rate, they showed similar susceptibility to temperature increase (roughly to climate warming).

Soil Respiration Variations in Temperate Rhododendron (Rhododendronarboreum) Forest of Annapurna Conservation Area (ACA) in Nepal

“…Soil respiration (SR) is one of the major pathways of the carbon dioxide e ux from the soil, thus determining SR is the most effective measure to elucidate the carbon emission that could be made accurate in estimation of the global carbon budget (Trumbore 2006). Given their critical role in the global carbon SR measurement and modeling issues have been kept in priority and well studied (Xu and Klimek et al 2021). In this study, the major environmental factor, the ST showed a statistically signi cant exponential effect on SR variations in 2-years (Fig.…”

“…The two years average seasonal mean SR (282.5 mg CO 2 m −2 h −1 ) of this temperate R. arboreum forest was within the range (90-551 mg CO 2 m −2 h −1 and 98-305 mg CO 2 m −2 h −1 ) of daily mean SR during autumn season in cool-temperate Mongolian Quercus forests in Korea (Kim et al 2020). Due to the complexity of the components and spatially heterogeneous nature of the forest's soil, it is much di cult to understand the environmental variability (Li et al, 2013), and uniquely coupled with other biotic processes, the most common might be the soil properties in generating a broad spectrum of CO 2 emission rates in the temperate forests (Klimek et al 2021). The prior observations by Cui et al (2020) and Kochiieru et al (2021) suggested that it is not surprising that SR rates vary considerably in different seasons, years and in the different forests, eco-zones, and even in the different soils and land use types.…”

“…As the variety of biotic and abiotic factors regulates the rate of SR (You et al 2019), the optimum soil moisture (30-40%, Fig. 4a2 and b2) with maximal water holding capacity allows in achieving the maximal respiration rate (Klimek et al 2021), and the moisture content in soil may modify the temperature sensitivity of soil microbial respiration and thus activate the temperature sensitivity of the SR (Lellei-Kovács et al 2011). The previous study also revealed that when both ST and SWC are not at their extremes, these two factors interactively in uence the SR and integrated can account for most of its variability and more during active growing season than the dormant seasons (Luo and Zhou 2006).…”

Soil Respiration Variations in Temperate Rhododendron (Rhododendron arboreum) Forest of Annapurna Conservation Area (ACA) in Nepal

“…However, litter decomposition and soil respiration in C cycle have diferent appearance in the temperate forest than that of the tropics [16,17]. Although soil temperature (ST), soil water content (SWC), and the light activity (photosynthetic photon fux density (PPFD)) are considered major environmental criterion in infuencing SR, seasonal fuctuations alter its variability in temporal scale [18] is diferent in temperate ecosystems [14,19,20] than that of the tropical [21,22]. Te temperate forests sequestrate and emit huge volume of atmospheric CO 2 , and that amount could literally contribute a signifcant role in the global C cycle [2].…”

“…Te recently published data however indicated that temperate forests are an important sink of atmospheric C [23]. Tus, the research interest in a temperate forest is growing under the context of climatic warming [20,24]. About 23% of Nepal's land area has been designated under various categories of protected area which includes national parks, reserves, conservation areas, and buferzones [25].…”