Soil moisture modifies the response of soil respiration to temperature in a desert shrub ecosystem

Wang, B.; Zha, Tianshan; Jia, Xin; Wu, Bin; Zhang, Y. Q.; Qin, Shugao

doi:10.5194/bgd-10-9213-2013

Cited by 30 publications

(50 citation statements)

References 50 publications

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“…Such a relationship is in agreement with other previous studies (Davidson et al, 1998;Martin and Bolstad, 2005;Wang et al, 2013). The positive linear relationship between SR and soil moisture in low soil moisture conditions found in our work agrees with many previous studies where low soil moisture constrains SR (Almagro et al, 2009;Davidson et al, 1998;Keith et al, 1997;Rey et al, 2002;Wang et al, 2013;Xu and Qi, 2001). In our study, the low soil moisture and warmer temperatures actually reduced SR rates, resulting in lower Q 10 values at the lower soil moisture.…”

Section: Confounding Effects Of Temperature and Moisture On Srsupporting

confidence: 83%

“…Using the recursive partitioning method, we have identified clear thresholds for SM 5 effects on the temperature sensitivity of SR. Soil moisture thresholds at which SR temperature sensitivity is reduced have been found in several studies from different ecosystems (Fang and Moncrieff, 2001;GaumontGuay et al, 2006;Jassal et al, 2008;Lellei-Kovács et al, 2011;Palmroth et al, 2005;Wang et al, 2013). However, the threshold values in soil moisture seem to be site specific as the factors limiting water uptake by plants and microbes may differ by ecosystem.…”

Section: Confounding Effects Of Temperature and Moisture On Srmentioning

confidence: 95%

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Does soil moisture overrule temperature dependence of soil respiration in Mediterranean riparian forests?

et al. 2014

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Abstract. Soil respiration (SR) is a major component of ecosystems' carbon cycles and represents the second largest CO 2 flux in the terrestrial biosphere. Soil temperature is considered to be the primary abiotic control on SR, whereas soil moisture is the secondary control factor. However, soil moisture can become the dominant control on SR in very wet or dry conditions. Determining the trigger that makes soil moisture as the primary control factor of SR will provide a deeper understanding on how SR changes under the projected future increase in droughts. Specific objectives of this study were (1) to investigate the seasonal variations and the relationship between SR and both soil temperature and moisture in a Mediterranean riparian forest along a groundwater level gradient; (2) to determine soil moisture thresholds at which SR is controlled by soil moisture rather than by temperature; (3) to compare SR responses under different tree species present in a Mediterranean riparian forest (Alnus glutinosa, Populus nigra and Fraxinus excelsior). Results showed that the heterotrophic soil respiration rate, groundwater level and 30 cm integral soil moisture (SM 30 ) decreased significantly from the riverside moving uphill and showed a pronounced seasonality. SR rates showed significant differences between tree species, with higher SR for P. nigra and lower SR for A. glutinosa. The lower threshold of soil moisture was 20 and 17 % for heterotrophic and total SR, respectively. Daily mean SR rate was positively correlated with soil temperature when soil moisture exceeded the threshold, with Q 10 values ranging from 1.19 to 2.14; nevertheless, SR became decoupled from soil temperature when soil moisture dropped below these thresholds.

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Section: Confounding Effects Of Temperature and Moisture On Srsupporting

confidence: 83%

Section: Confounding Effects Of Temperature and Moisture On Srmentioning

confidence: 95%

Does soil moisture overrule temperature dependence of soil respiration in Mediterranean riparian forests?

et al. 2014

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“…It is known that Q 10 of soil respiration responds to environmental conditions, especially temperature and soil water content e.g. Hashimoto et al, 2009;Wang et al, 2014 . However, the response of Q 10 to soil nutrient condition is not very understood.…”

Section: Discussionmentioning

confidence: 99%

Effects of ozone on soil respiration rate of Siebold’s beech seedlings grown under different soil nutrient conditions

Watanabe

Okabe

Kinose

et al. 2019

J. Agric. Meteorol.

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Ozone O 3 is an air pollutant that negatively affect carbon budget in woody plants. In the present study, we aimed to clarify the effects of ozone on soil respiration rate of Siebold's beech seedlings Fagus crenata grown under different soil-nutrient conditions. Seedlings were grown under three levels of O 3 fumigation charcoal-filtered air or O 3 at 1.0 or 1.5 times ambient concentration in combination with three levels of nutrient supplies non-, low-or high-fertilised for two growing seasons. We determined soil respiration rate in July, August, September, and October of the second growing season. The seedlings were harvested to determine the dry mass in October. Significant effect of O 3 on soil respiration rate was not observed in all measurements. There was a significant interaction between O 3 and nutrient supply for whole-root dry mass. The dry mass in non-fertilised and low-fertilised treatments was reduced by O 3 , whereas O 3 did not affect dry mass in the high-fertilised treatment. On the other hand, neither significant effects of O 3 , nor a significant interaction between O 3 and nutrient supply for the biomass allocations were observed. Coefficient of positive correlation in the relation of soil respiration rate with dry mass of fine-root across the all treatments was higher than that in the relation of soil respiration rate with coarse-root and whole-root dry mass. These results indicate that no significant effect of O 3 on soil respiration was mainly attributable to no response of fine root dry mass to elevated O 3 . Soil nutrient supply decreased soil respiration rate in August. Our results emphasize the importance of fine root in the response of soil respiration to elevated O 3 . To clarify the response of soil respiration to elevated O 3 , future researches on the effect of O 3 on fine root dynamics including turnover and indirect effect on soil microbial respiration are needed.

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“…All hourly CO 2 flux values on sterilized soil, [2 lmol m -2 s -1 or \-2 lmol m -2 s -1 were considered abnormal and removed. All hourly soil CO 2 flux values for the unsterilized, [5 lmol m -2 s -1 or \-2 lmol m -2 s -1 were screened out (Wang et al 2014). All the soil carbon flux values with [5 9 the standard deviation from the monthly mean were also excluded (Jia et al 2013;Yu et al 2011).…”

Section: Data Processing and Analysismentioning

confidence: 99%

Abiotic CO2 exchange between soil and atmosphere and its response to temperature

et al. 2014

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Although abiotic CO 2 exchange between soil and atmosphere is often observed in deserts, its contribution to carbon balance and accurate response to soil temperature (T s (°C)) are still uncertain. Abiotic soil carbon flux (ASCF) and T s were continuously measured on sterilized soil at 2-day intervals in the Mu Us Desert, northwestern China from May to October in 2012. The results showed that negative ASCF (CO 2 absorption) occurred at night while positive ASCF (CO 2 emission) during the day. Net CO 2 sequestration during the 6 months totaled 64.37 g CO2 m -2 (0.09 lmol m -2 s -1 ). On the seasonal scale, ASCF was weakly correlated with T s (c = 0.15, p \ 0.01), but showed a strong positive correlation with the rate of change in T s (DT/Dt (°C h -1 )) (c = 0.82, p \ 0.01). On the diurnal scale, ASCF showed clear hysteresis loops with respect to T s , but DT/Dt explained more than 85 % of the diurnal variations in ASCF for different months. The results indicate that a non-trivial CO 2 exchange process between soil and atmosphere can induce carbon sequestration and this exchange process is modified by temperature. Although soil temperature cannot be directly used to explain the effect of temperature on the abiotic soil carbon flux, the rate of change in soil temperature can accurately interpret the role of temperature played in the abiotic CO 2 exchange between soil and atmosphere. CO 2 absorption and emission by the desert soil is driven by the rate of falling and rising of T s , respectively. The findings may have significant implications for the global carbon cycle and may facilitate to explore the formation of this abiotic CO 2 exchange process.

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Soil moisture modifies the response of soil respiration to temperature in a desert shrub ecosystem

Cited by 30 publications

References 50 publications

Does soil moisture overrule temperature dependence of soil respiration in Mediterranean riparian forests?

Does soil moisture overrule temperature dependence of soil respiration in Mediterranean riparian forests?

Effects of ozone on soil respiration rate of Siebold’s beech seedlings grown under different soil nutrient conditions

Abiotic CO2 exchange between soil and atmosphere and its response to temperature

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