Simulated rain addition modifies diurnal patterns and temperature sensitivities of autotrophic and heterotrophic soil respiration in an arid desert ecosystem

Song, Weimin; Chen, Shiping; Wu, Bo; Zhu, Yanhui; Zhou, Yadan; Lu, Qi; Lin, Guanghui

doi:10.1016/j.soilbio.2014.12.020

Cited by 30 publications

(18 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To further diagnose the influences of various drivers that have not been included in the model calculation, we performed multiple linear regression of F3 over all land polygons as a function of vegetation type, annual precipitation, and average temperature. The results show that the spatial variation of F3 is primarily driven by the average temperature (18.8%), which controls the key parameter of net primary production (NPP) through affecting the enzyme kinetics during the processes of photosynthesis and autotrophic respiration (50,51), and is secondarily driven by precipitation and vegetation types. The most sensitive regions, which are small in area but contribute a great amount to both lateral and vertical C fluxes, are hotspots on which conservation policies should be focused.…”

Section: ) (3)mentioning

confidence: 99%

Lateral transport of soil carbon and land−atmosphere CO ₂ flux induced by water erosion in China

Yao

Ciais

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

134

151

View full text Add to dashboard Cite

Soil erosion by water impacts soil organic carbon stocks and alters CO 2 fluxes exchanged with the atmosphere. The role of erosion as a net sink or source of atmospheric CO 2 remains highly debated, and little information is available at scales larger than small catchments or regions. This study attempts to quantify the lateral transport of soil carbon and consequent land−atmosphere CO 2 fluxes at the scale of China, where severe erosion has occurred for several decades. Based on the distribution of soil erosion rates derived from detailed national surveys and soil carbon inventories, here we show that water erosion in China displaced 180 ± 80 Mt C·y −1 of soil organic carbon during the last two decades, and this resulted a net land sink for atmospheric CO 2 of 45 ± 25 Mt C·y , equivalent to 8-37% of the terrestrial carbon sink previously assessed in China. Interestingly, the "hotspots," largely distributed in mountainous regions in the most intensive sink areas (>40 g C·m ), occupy only 1.5% of the total area suffering water erosion, but contribute 19.3% to the national erosion-induced CO 2 sink. The erosion-induced CO 2 sink underwent a remarkable reduction of about 16% from the middle 1990s to the early 2010s, due to diminishing erosion after the implementation of large-scale soil conservation programs. These findings demonstrate the necessity of including erosion-induced CO 2 in the terrestrial budget, hence reducing the level of uncertainty.land−atmosphere CO 2 flux | soil carbon displacement | water erosion | national scale T errestrial ecosystems are a net sink of anthropogenic CO 2 globally (1, 2) but can be net sources or sinks regionally [e.g., Northeast Region of China (3)]. Knowledge of the distribution, magnitude, and variability of land carbon fluxes and underlying processes is important both for improving model-based projections of the carbon cycle and for designing ecosystem management options that effectively preserve carbon stocks and enhance carbon sinks. Despite considerable efforts made by the research community, the mechanisms governing uptake or release of carbon from land ecosystems are still poorly quantified (4).Soil erosion occurs naturally but is accelerated by human cultivation of the landscape, and modifies CO 2 exchange (5) between the soil and atmosphere. Soil erosion destroys the physical protection of carbon in soil aggregates and accelerates decomposition, inducing a net CO 2 source. Continuous erosion over a long period can destabilize carbon in deeper soil horizons and trigger its decomposition e.g., as conditions of temperature and moisture become more favorable (6, 7). Soil erosion also decreases nutrient availability and reduces soil water holding capacity, affecting ecosystem productivity (8) with feedback to the ecosystem carbon balance. However, because only a fraction of eroded carbon is lost to the atmosphere, the rest may be lost to streams and rivers and eventually delivered to marine ecosystems or deposited in the landscape. With the fine and light soil particles p...

show abstract

Section: ) (3)mentioning

confidence: 99%

Lateral transport of soil carbon and land−atmosphere CO ₂ flux induced by water erosion in China

Yao

Ciais

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

134

151

View full text Add to dashboard Cite

show abstract

“…However, studies showed that Q 10 was spatially heterogeneous and varied with environmental factors such as temperature and moisture . For example, Q 10 was relatively higher during the edges (start and end) of the growing season (GS) than during its peak . It was also reported that Q 10 may acclimate to warming due to depletion of soil substrates, limitation of soil moisture, and alteration of soil microbial activities .…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Diurnal and Monthly Responses of Ecosystem Carbon Fluxes to Experimental Warming

Chen

Zhou

Hruska

et al. 2017

CLEAN Soil Air Water

View full text Add to dashboard Cite

Research Article Asymmetric Diurnal and Monthly Responses of Ecosystem Carbon Fluxes to Experimental WarmingQuantifying the diurnal and monthly responses of ecosystem carbon (C) fluxes is critical to accurately understand the feedback between global climate change and ecosystem C dynamics. However, the diurnal and monthly responses of ecosystem C fluxes to climate warming remain unclear. In this study, a field simulated warming experiment was conducted by using open top chambers to explore the diurnal and monthly responses of ecosystem C fluxes during one growing season (GS) in a Tibetan Plateau grassland. The results showed that ecosystem C fluxes responded unevenly to the simulated warming during one GS. Warming significantly increased C uptake (gross primary production) and sequestration (net ecosystem exchange) during the start (May to June) and peak (July to August) of the GS, but promoted ecosystem respiration (ER) during the peak and end (September to October) of the GS. Warming also had more pronounced positive effects on ER during night than during day. In addition, although warming significantly decreased the temperature sensitivity (Q 10 ) of ER over the whole GS, Q 10 also responded positively to warming during the start and end of GS as well as during the night. These results highlight the hypothesis that asymmetrical responses of the diurnal and monthly variations of ecosystem C fluxes and Q 10 should be taken into consideration to project the C-climate feedback, especially under future non-uniform warming scenarios.Global mean temperature has been increasing since the Industrial Revolution and is expected to rise another 1.2-6.1°C by the end of this century [1]. This projected warming would have a great potential to alter ecosystem carbon (C) fluxes, causing either positive or negative C-climate feedback [2]. Feedback will be positive if warming results in net C release, but negative if warming results in net C uptake in the ecosystem. In the IPCC earth system models (ESMs), C-climate feedback was modeled using uniform diurnal and seasonal ecosystem C fluxes [3, 4], but model results were variable and at times contradictory [5,6]. These modeling results are further undermined by recent research showing that the effects of warming on ecosystem C fluxes vary at Correspondence: Professor Junji Cao,

show abstract

“…Annual carbon sequestration would be largely overestimated if soil CO 2 fluxes in the DS were not included10. Moreover, several studies by using different approaches including stable isotope methods11, modeling methods verified by eddy covariance system12, or by using soil respiration monitoring system1314 indicated that soil CO 2 fluxes differed largely between daytime and nighttime. Nevertheless, we have still known little about the proportions and variations of nighttime and the DS R S in annual soil C fluxes in specific ecosystems.…”

mentioning

confidence: 99%

“…It varies with environmental factors and with different components of R S , largely due to the fact that Q 10 is regulated by various biotic and abiotic factors, such as soil temperature and soil water content, microbial biomass, substrate quality, and plant physiological activity131516. However, estimates of Q 10 are mostly based on measurements in daytime and during the GS, and few measurements were conducted in winter and at nighttime.…”

mentioning

confidence: 99%

“…found that annual Q 10 ranged from 3.10 to 4.69, indicating that Q 10 varies between the GS and the DS8. Additionally, some studies reported that Q 10 value of heterotrophic respiration was lower than that of autotrophic respiration18, while other studies showed the opposite result413. Because a slight deviation of Q 10 may cause a huge bias in the estimate of R S 15, a better understanding of Q 10 of different R S components in different times can improve our understanding of the roles of forests in regulating carbon cycle and shaping its response to climate change.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Soil respiration and its environmental response varies by day/night and by growing/dormant season in a subalpine forest

Liu

et al. 2016

Sci Rep

View full text Add to dashboard Cite

Comparisons of soil respiration (RS) and its components of heterotrophic (RH) and rhizospheric (RR) respiration during daytime and nighttime, growing (GS) and dormant season (DS), have not being well studied and documented. In this study, we compared RS, RH, RR, and their responses to soil temperature (T5) and moisture (θ5) in daytime vs. nighttime and GS vs. DS in a subalpine forest in 2011. In GS, nighttime RS and RH rates were 30.5 ± 4.4% (mean ± SE) and 30.2 ± 6.5% lower than in daytime, while in DS, they were 35.5 ± 5.5% and 37.3 ± 8.5% lower, respectively. DS RS and RH accounted for 27.3 ± 2.5% and 27.6 ± 2.6% of GS RS and RH, respectively. The temperature sensitivities (Q10) of RS and RH were higher in nighttime than daytime, and in DS than GS, while they all decreased with increase of T5. Soil C fluxes were more responsive to θ5 in nighttime than daytime, and in DS than GS. Our results suggest that the DS and nighttime RS play an important role in regulating carbon cycle and its response to climate change in alpine forests, and therefore, they should be taken into consideration in order to make accurate predictions of RS and ecosystem carbon cycle under climate change scenarios.

show abstract

Simulated rain addition modifies diurnal patterns and temperature sensitivities of autotrophic and heterotrophic soil respiration in an arid desert ecosystem

Cited by 30 publications

References 86 publications

Lateral transport of soil carbon and land−atmosphere CO ₂ flux induced by water erosion in China

Lateral transport of soil carbon and land−atmosphere CO ₂ flux induced by water erosion in China

Asymmetric Diurnal and Monthly Responses of Ecosystem Carbon Fluxes to Experimental Warming

Soil respiration and its environmental response varies by day/night and by growing/dormant season in a subalpine forest

Contact Info

Product

Resources

About

Simulated rain addition modifies diurnal patterns and temperature sensitivities of autotrophic and heterotrophic soil respiration in an arid desert ecosystem

Cited by 30 publications

References 86 publications

Lateral transport of soil carbon and land−atmosphere CO 2 flux induced by water erosion in China

Lateral transport of soil carbon and land−atmosphere CO 2 flux induced by water erosion in China

Asymmetric Diurnal and Monthly Responses of Ecosystem Carbon Fluxes to Experimental Warming

Soil respiration and its environmental response varies by day/night and by growing/dormant season in a subalpine forest

Contact Info

Product

Resources

About

Lateral transport of soil carbon and land−atmosphere CO ₂ flux induced by water erosion in China

Lateral transport of soil carbon and land−atmosphere CO ₂ flux induced by water erosion in China