Temperature sensitivity of total soil respiration and its heterotrophic and autotrophic components in six vegetation types of subtropical China

Yu, Shiqin; Chen, Yuanqi; Zhao, Jie; Fu, Shenglei; Li, Zhian; Hong, Xianpei; Zhou, Lixia

doi:10.1016/j.scitotenv.2017.06.194

Cited by 65 publications

(27 citation statements)

References 63 publications

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“…Soil temperature strongly accounted for the seasonal variation of soil respiration, whereas soil moisture also explained a part ( Figure S2). The relationship between soil respiration and soil temperature/moisture also coincides with most of other studies (Gaumont-Guay et al, 2006;Lloyd & Taylor, 1994;Yu et al, 2017).…”

Section: Effects On Soil Respirationsupporting

confidence: 89%

Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest

Chen

et al. 2019

Ecology and Evolution

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Precipitation is projected to change intensity and seasonal regime under current global projections. However, little is known about how seasonal precipitation changes will affect soil respiration, especially in seasonally dry tropical forests. In a seasonally dry tropical forest in South China, we conducted a precipitation manipulation experiment to simulate a delayed wet season (DW) and a wetter wet season (WW) over a three-year period. In DW, we reduced 60% throughfall in April and May to delay the onset of the wet season and irrigated the same amount water into the plots in October and November to extend the end of the wet season. In WW, we irrigated 25% annual precipitation into plots in July and August. A control treatment (CT) receiving ambient precipitation was also established. Compared with CT, DW significantly increased soil moisture by 54% during October to November, and by 30% during December to April. The treatment of WW did not significantly affect monthly measured soil moisture. In 2015, DW significantly increased leaf area index and soil microbial biomass but decreased fine root biomass. In contrast, WW significantly decreased fine root biomass and forest floor litter stocks. Soil respiration was not affected by DW, which could be attributed to the increased microbial biomass offsetting the decrease in fine root biomass. In contrast, WW significantly increased soil respiration from 3.40 to 3.90 μmol m −2 s −1 in the third year, mainly due to the increased litter decomposition and soil pH (from 4.48 to 4.68). The present study suggests that both a delayed wet season and a wetter wet season will have significant impacts on soil respiration-associated ecosystem components. However, the ecosystem components can respond in different directions to the same change in precipitation, which ultimately affected soil respiration. K E Y W O R D S climate change, precipitation regime, rainfall change, soil CO 2 , tropics S U PP O RTI N G I N FO R M ATI O N Additional supporting information may be found online in the Supporting Information section. How to cite this article: Yu S, Mo Q, Chen Y, et al. Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest. Ecol Evol. 2020;10:467-479.

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Section: Effects On Soil Respirationsupporting

confidence: 89%

Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest

Chen

et al. 2019

Ecology and Evolution

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“…However, we previously found that there were no significant differences in soil organic carbon among these plantations [41], and there were no significant differences in soil pH, soil nitrogen, soil available phosphorus among the above six plantations [42]. Moreover, in our experimental sites, the effects of plantation type on mean soil temperature, soil water content, and leaf area index were not significant either [43]. Therefore, we speculate that it could be ascribed to the differences in microenvironment among different plantations.…”

Section: Effects Of Plantation Typecontrasting

confidence: 59%

Dynamics of Understory Shrub Biomass in Six Young Plantations of Southern Subtropical China

Chen

Zhang

et al. 2017

Forests

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Abstract:Understory shrubs are an important component of forest ecosystems and drive ecosystem processes, such as ecosystem carbon cycling. However, shrub biomass carbon stocks have rarely been reported, which limits our understanding of ecosystem C stock and cycling. In this study, we evaluated carbon accumulation of shrub species using allometric equations based on height and basal diameter in six subtropical plantations at the age of 1, 3, 4 and 6 years. The results showed that plantation type did not significantly affect the total biomass of shrubs, but it significantly affected the biomass of Rhodomyrtus tomentosa, Ilex asprella, Clerodendrum fortunatum and Baeckea frutescens. The biomass of dominant shrub species R. tomentosa, I. asprella, Gardenia jasminoides and Melastoma candidum increased with stand age, while the biomass of C. fortunatum and B. frutescens decreased. The inconsistent biomass-time patterns of different shrub species may be the primary reason for the altered total shrub biomass in each plantation. Consequently, we proposed that R. tomentosa, I. asprella, G. jasminoides and M. candidum could be preferable for understory carbon accumulation and should be maintained or planted because of their important functions in carbon accumulation and high economic values in the young plantations of southern subtropical China.

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“…Soil respiration is the largest vertical carbon efflux from soil to atmosphere and has the considerable potential to induce atmospheric carbon dioxide concentration variation-an increasingly alarming issue in context of global climate change (Yu et al 2017). Soil respiration can indicate soil mineralization through SOC decomposition via microbes and can be affected by numerous factors including, but not excluding, soil temperature, soil moisture, and physical protection within soil aggregates (Doetterl et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Soil erosion affects variations of soil organic carbon and soil respiration along a slope in Northeast China

Zhang

Wang

et al. 2019

Ecol Process

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Background: Although soil erosion plays a key role in the carbon cycle, a holistic and mechanistic understanding of the soil erosion process within the cycle is still lacking. The aim of this study was therefore to improve our mechanistic understanding of soil organic carbon (SOC) and soil respiration dynamics through an experiment conducted in an eroding black soil farmland landscape in Northeast China. Results: The depositional profiles store 5.9 times more SOC than the eroding profiles and 3.3 times more SOC than the non-eroding profiles. A linear correlation between the SOC and 137 Cs (Caesium-137) was observed in our study, suggesting that the SOC decreased with increased soil erosion. Furthermore, the fractions of intermediate C and the microaggregate C were lowest at the eroding position and highest at the depositional position. In the depositional topsoil, the input of labile materials plays a promotional role in soil respiration. Conversely, in the subsoil (i.e., below 10 cm), the potential mineralization rates were lowest at the depositional position-due to effective stabilization by physical protection within soil microaggregates. The field results of soil surface respiration also suggest that the depositional topsoil SOC is prone to be mineralized and that SOC at this depositional context is stabilized at subsoil depth. In addition, the high water contents at the depositional position can limit the decomposition rates and stabilize the SOC at the same time. Conclusions:The findings from this study support that a majority of the SOC at footslope is stored within most of the soil profile (i.e., below 10 cm) and submitted to long-term stabilization, and meanwhile support that the depositional profile emits more CO 2 than the summit due to its high amount and quality of SOC.

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Temperature sensitivity of total soil respiration and its heterotrophic and autotrophic components in six vegetation types of subtropical China

Cited by 65 publications

References 63 publications

Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest

Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest

Dynamics of Understory Shrub Biomass in Six Young Plantations of Southern Subtropical China

Soil erosion affects variations of soil organic carbon and soil respiration along a slope in Northeast China

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