Patterns and controls of temperature sensitivity of soil respiration in a meadow steppe of the Songnen Plain, Northeast China

AbstractTemperature sensitivity of respiration of forest soils is important for its responses to climate warming and for the accurate assessment of soil carbon budget. The sensitivity of temperature (Ti) to soil respiration rate (Rs), and Q10 defined by e10(lnRs−lna)/Ti has been used extensively for indicating the sensitivity of soil respiration. The soil respiration under a larch (Larix gmelinii) forest in the northern Daxing’an Mountains, Northeast China was observed in situ from April to September, 2019 using the dynamic chamber method. Air temperatures (Tair), soil surface temperatures (T0cm), soil temperatures at depths of 5 and 10 cm (T5cm and T10cm, respectively), and soil-surface water vapor concentrations were monitored at the same time. The results show a significant monthly variability in soil respiration rate in the growing season (April–September). The Q10 at the surface and at depths of 5 and 10 cm was estimated at 5.6, 6.3, and 7.2, respectively. The Q10@10 cm over the period of surface soil thawing (Q10@10 cm, thaw = 36.89) were significantly higher than that of the growing season (Q10@10 cm, growth = 3.82). Furthermore, the Rs in the early stage of near-surface soil thawing and in the middle of the growing season is more sensitive to changes in soil temperatures. Soil temperature is thus the dominant factor for season variations in soil respiration, but rainfall is the main controller for short-term fluctuations in respiration. Thus, the higher sensitivity of soil respiration to temperature (Q10) is found in the middle part of the growing season. The monthly and seasonal Q10 values better reflect the responsiveness of soil respiration to changes in hydrometeorology and ground freeze-thaw processes. This study may help assess the stability of the soil carbon pool and strength of carbon fluxes in the larch forested permafrost regions in the northern Daxing’an Mountains.

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Spatio-temporal variations of soil respiration in five typical plant communities in the meadow steppe of the western Songnen Plain, China

Chinese Journal of Plant Ecology ◽

10.3724/sp.j.1258.2014.00036 ◽

2014 ◽

Vol 38 (4) ◽

pp. 396-404 ◽

Cited By ~ 1

Author(s):

WANG Ming ◽

◽

LIU Xing-Tu ◽

ZHANG Ji-Tao ◽

LI Xiu-Jun ◽

...

Keyword(s):

Soil Respiration ◽

Plant Communities ◽

Temporal Variations ◽

Meadow Steppe ◽

Songnen Plain ◽

Spatio Temporal

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Combined application of biochar and N increased temperature sensitivity of soil respiration but still decreased the soil CO2 emissions in moso bamboo plantations

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.139003 ◽

2020 ◽

Vol 730 ◽

pp. 139003

Author(s):

Xiaogai Ge ◽

Yonghui Cao ◽

Benzhi Zhou ◽

Wenfa Xiao ◽

Xiaokun Tian ◽

...

Keyword(s):

Soil Respiration ◽

Co2 Emissions ◽

Temperature Sensitivity ◽

Moso Bamboo ◽

Soil Co2 ◽

Combined Application ◽

Increased Temperature ◽

Soil Co2 Emissions

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Increased Litter Greatly Enhancing Soil Respiration in Betula platyphylla Forests of Permafrost Region, Northeast China

Forests ◽

10.3390/f12010089 ◽

2021 ◽

Vol 12 (1) ◽

pp. 89

Author(s):

Hong Wei ◽

Xiuling Man

Keyword(s):

Soil Respiration ◽

Carbon Cycle ◽

Soil Carbon ◽

Northeast China ◽

Stand Age ◽

Permafrost Region ◽

Betula Platyphylla ◽

Litter Input ◽

Litter Manipulation ◽

And Control

The change of litter input can affect soil respiration (Rs) by influencing the availability of soil organic carbon and nutrients, regulating soil microenvironments, thus resulting in a profound influence on soil carbon cycle of the forest ecosystem. We conducted an aboveground litterfall manipulation experiment in different-aged Betula platyphylla forests (25-, 40- and 61-year-old) of the permafrost region, located in the northeast of China, during May to October in 2018, with each stand treated with doubling litter (litter addition, DL), litter exclusion (no-litter, NL) and control litter (CK). Our results indicated that Rs decreased under NL treatment compared with CK treatment. The effect size lessened with the increase in the stand age; the greatest reduction was found for young Betula platyphylla forest (24.46% for 25-year-old stand) and tended to stabilize with the growth of forest with the reduction of 15.65% and 15.23% for 40-and 61- year-old stands, respectively. Meanwhile, under DL treatment, Rs increased by 27.38%, 23.83% and 23.58% on 25-, 40- and 61-year-old stands, respectively. Our results also showed that the increase caused by DL treatment was larger than the reduction caused by NL treatment, leading to a priming effect, especially on 40- and 61-year-old stands. The change in litter input was the principal factor affecting the change of Rs under litter manipulation. The soil temperature was also a main factor affecting the contribution rate of litter to Rs of different-aged stands, which had a significant positive exponential correlation with Rs. This suggests that there is a significant relationship between litter and Rs, which consequently influences the soil carbon cycle in Betula platyphylla forests of the permafrost region, Northeast China. Our finding indicated the increased litter enhanced the Rs in Betula platyphylla forest, which may consequently increase the carbon emission in a warming climate in the future. It is of great importance for future forest management in the permafrost region, Northeast China.

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