scholarly journals Components of Soil Respiration and Its Temperature Sensitivity in Four Reconstructed Soils

2021 ◽  
Author(s):  
Na Lei ◽  
huanyuan Wang ◽  
tianqing Chen
Keyword(s):  
Soil Respiration ◽  
Soil Temperature ◽  
Seasonal Changes ◽  
Soft Rock ◽  
Flux Measurement ◽  
Heterotrophic Respiration ◽  
Autotrophic Respiration ◽  
Reconstituted Soil ◽  
Function Characterization ◽  
Reconstructed Soil

Abstract seasonal changes characteristics in the respiration of four reconstructed soils Abstract: seasonal changes characteristics in the respiration of four reconstructed soil masses 9 in a barren gravel land were monitored using soil carbon flux measurement system. The 10 results showed that (1) The seasonal changes in soil respiration and heterotrophic respiration 11 of four reconstructed soils of meteorite, shale, sand and soft rock were the same as the 12 seasonal change in soil temperature. Soil respiration and heterotrophic respiration increased 13 with soil temperature. It was gradually increasing, reaching the maximum in summer and 14 decreasing to the minimum in winter. Among the four reconstructed soils, the average annual 15 soil respiration of reconstructed soil with sand was 4.87 μmol•m –2 •s –1 , which was 16 significantly higher than the other reconstructed soils (p<0.05).(2) The autotrophic respiration 17 of four reconstructed soils showed obvious seasonal dynamic changes. The maximum and 18 minimum values appeared in August 2018 and January 2018, respectively. In the whole year, 19 The variation range of the annual average soil autotrophic respiration in the total respiration 20 of the reconstituted soil with addtion of meteorite, shale, sand and soft rock were 12.5-38.0%, 21 9.5-42.0%, 7.7-41.2%, and 5.0-39.3%, respectively.(3) Soil temperature was the main factor 22 affecting soil respiration. The four reconstructed respiration had a very significant correlation 23 with soil temperature (p<0.01). The relationship between reconstructed soils respiration and 24 soil temperature can be indexed function characterization. The 90% to 93% changes in soil 25 respiration of reconstructed soils were caused by soil temperature. The order of Q 10 in soils 26 respiration of four reconstructed was as follows: Sand> shale> soft rock > meteorite.

scholarly journals Respiration characteristics and its responses to hydrothermal seasonal changes in reconstructed soils

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Na Lei ◽  
Juan Li ◽  
Tianqing Chen
Keyword(s):  
Soil Respiration ◽  
Water Content ◽  
Respiration Rate ◽  
Exponential Function ◽  
Seasonal Changes ◽  
Volumetric Water Content ◽  
Heterotrophic Respiration ◽  
Autotrophic Respiration ◽  
Monthly Average ◽  
Respiration Rates

AbstractSeasonal changes in respiration and the components of four reconstructed soils (gravel + meteorite + lou; gravel + shale + lou; gravel + sand + lou; and gravel + soft rock + lou) in barren gravel land were monitored using the soil carbon flux measurement system. The results showed that (1) the monthly average respiration rate and the rates of the components in the four reconstructed soils were the highest in summer and lowest in winter. In winter, the monthly average respiration rates of the four reconstructed soils were not different (p > 0.05). In summer, the monthly average respiration rate of the sand or meteorite reconstructed soil was different from that of the other three (p < 0.05). (2) The heterotrophic and autotrophic respiration rates were different between the four reconstructed soils (p < 0.05). The contribution of heterotrophic respiration to total respiration in the four reconstructed soils was greater than that of autotrophic respiration throughout the year. In winter, autotrophic respiration accounts for the smallest proportion of total respiration. As the temperature rises, the proportion of autotrophic respiration to total respiration gradually increases and peaks in summer. In summer, the proportion of heterotrophic respiration in the total respiration is the smallest. With the decrease in temperature, the proportion of heterotrophic respiration in total respiration gradually increases and peaks in winter. (3) The maximum and minimum values of the monthly average respiration rate of the four reconstructed soils coincided with the months of maximum and minimum soil temperature. The soil volumetric water content changed with the amount of precipitation. The correlation between soil respiration and temperature was greater than that between soil respiration and volumetric water content. (4) The correlation in seasonal variation between respiration of the four remodelled soils and hydrothermal factors in the study area can be characterised by an exponential function and power-exponential function.

Characteristics on Soil Respiration of Eucalyptus Plantation with Four Years Old in Beihai of Guangxi, Southern China

2014 ◽  
Vol 618 ◽  
pp. 380-387
Author(s):  
Jiang Ming Ma ◽  
Meng Wu ◽  
Ting Ting Zhan ◽  
Feng Tian ◽  
Shi Chu Liang
Keyword(s):  
Soil Moisture ◽  
Soil Respiration ◽  
Moisture Content ◽  
Soil Temperature ◽  
Respiration Rate ◽  
Soil Moisture Content ◽  
Southern China ◽  
Heterotrophic Respiration ◽  
Autotrophic Respiration ◽  
Soil Respiration Rate

This experiment was conducted on the 4 years old Eucalyptus plantation in Beihai of Guangxi, southern China. From January to December 2013, in the spring, summer, autumn and winter, seasonal variation and diurnal variation of the soil respiration and its environmental factors had been observed, respectively. The results showed that: (1) Soil respirations has obvious seasonal characteristics, the soil respiration rate in each seasons showed that: summer> spring > autumn > winter. The heterotrophic respiration rate was higher than the autotrophic respiration rate. The contribution of autotrophic respiration rate in winter was higher than that in other three seasons. (2) Soil respiration has obvious diurnal characteristic, it could be expressed as a single-peak curve. But the maximum value of soil respiration appeared in different times in different seasons. (3) There existed positive correlation index exponential relationships between the soil temperature and the soil respiration rate and its components. Soil temperature changes could explain soil respiration, autotrophic respiration and heterotrophic respiration by 90.2%, 27.5% and 92.8%. Temperature sensitivity showed following order: the heterotrophic respiration rate> the soil respiration rate> the autotrophic respiration rate, in terms of affected by temperature, the heterotrophic respiration was higher than the autotrophic respiration. (4) There were notable positive correlations between soil moisture content and soil respiration rate. Obviously, soil moisture content could promote soil respiration in a certain range.

scholarly journals Seasonal Changes in Soil Respiration Of Degraded And Non-Degraded Sites in Oak and Pine Forests of Central Himalaya

1970 ◽  
Vol 6 (6) ◽  
pp. 89-93
Author(s):  
BS Jina ◽  
CPS Bohra ◽  
YS Rawat ◽  
MD Bhatt
Keyword(s):  
Soil Moisture ◽  
Soil Respiration ◽  
Soil Temperature ◽  
Seasonal Changes ◽  
Pine Forest ◽  
Pine Forests ◽  
Oak Forest ◽  
Central Himalaya ◽  
Decomposition Of Organic Matter ◽  
Scientific World

Present investigation deals with the seasonal changes in soil respiration of degraded and non-degraded oak and pine forests in Van Panchayat of Kumaun Himalaya. Soil temperature and soil moisture enhances soil respiration by increasing microbial activity and decomposition of organic matter. The rate of soil respiration was higher in non-degraded site of oak forest in Dhaili VP (63.9±1.6 to 363.6±5.3 mg CO2 m-2h-1), non-degraded site of pine forest (39.1±0.9 to 195.41.6 mg CO2 m-2h-1) in Guna VP, and lower in degraded pine forest in Toli VP (21.3±0.5 to 126.8±0.8 mg CO2 m-2h-1), degraded oak forest of Guna VP was (26.9±0.8 to 167.3±1.2 mg CO2 m-2h-1). Within non-degraded and degraded sites of both oak and pine forests soil respiration was positively correlated with soil temperature and soil moisture. Key words: Soil respiration; Degraded; Non-dedgraded; Van panchayat.   DOI: 10.3126/sw.v6i6.2641 Scientific World, Vol. 6, No. 6, July 2008 89-93

scholarly journals Autotrophic and heterotrophic contributions to soil respiration in a subtropical camphor tree forest

2021 ◽  
Author(s):  
Wende Yan ◽  
Yuanying Peng ◽  
Wei Zheng ◽  
Xiaoyong Chen
Keyword(s):  
Soil Respiration ◽  
Seasonal Changes ◽  
Carbon Balance ◽  
Autotrophic Respiration ◽  
Relative Contribution ◽  
Total Soil Respiration ◽  
Highly Correlated ◽  
Global Carbon ◽  
Primary Contribution ◽  
Camphor Tree

Understanding the contributions of autotrophic respiration (Ra) and heterotrophic respiration (Rh) to total soil respiration (Rs) is necessary for accurate prediction of global carbon balance and net ecosystem production under environmental change. In this research, annual Rs and Rh and estimated were investigated by using a root trenching experiment in a Camphor tree (Cinnamomum camphora) forest in subtropical China for two years to qualify the relative contribution of Ra and Rh components to Rs, and to determine the environmental factors that control the seasonal changes in Ra, Rh and Rs. The results showed that annual mean Rs was 405 ± 219 gC m-2 year-1 in the studied forests, of which Rh and Ra were 240 ± 120 gC m-2 year-1 and 164 ±102 gC m-2 year-1, respectively. The contribution of Rh to Rs averaged 58.1%, ranging from 45 to 81%. The seasonal changes in Rs and Rh were highly correlated with soil temperature, but not to soil water content. Our results suggest microbial community and activity make a primary contribution to carbon flux released from soil to atmosphere in the studied forest ecosystems.

scholarly journals Investigating the sensitivity of soil respiration to recent snow cover changes in Alaska using a satellite-based permafrost carbon model

2020 ◽  
Author(s):  
Yonghong Yi ◽  
John S. Kimball ◽  
Jennifer D. Watts ◽  
Susan M. Natali ◽  
Donatella Zona ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Soil Temperature ◽  
Soil Carbon ◽  
Snow Cover ◽  
Carbon Fluxes ◽  
Cold Season ◽  
Heterotrophic Respiration ◽  
Surface Model ◽  
Total Soil ◽  
Soil Heterotrophic Respiration

Abstract. The contribution of soil heterotrophic respiration to the boreal-Arctic carbon (CO2) cycle and its potential feedback to climate change remain poorly quantified. We developed a remote sensing driven permafrost carbon model at intermediate scale (~ 1 km) to investigate how environmental factors affect the magnitude and seasonality of soil heterotrophic respiration in Alaska. The permafrost carbon model simulates snow and soil thermal dynamics, and accounts for vertical soil carbon transport and decomposition at depths up to 3 m below surface. Model outputs include soil temperature profiles and carbon fluxes at 1-km resolution spanning the recent satellite era (2001–2017) across Alaska. Comparisons with eddy covariance tower measurements show that the model captures the seasonality of carbon fluxes, with favorable accuracy in predicting net ecosystem CO2 exchange (NEE) in both tundra (R > 0.8, RMSE = 0.34 g C m−2 d−1) and boreal forest (R > 0.73, RMSE = 0.51 g C m−2 d−1). Benchmark assessments using two regional in-situ datasets indicate that the model captures the complex influence of snow insulation on soil temperature, and the temperature sensitivity of cold-season soil respiration. Across Alaska, we find that seasonal snow cover imposes strong controls on the contribution from different soil depths to total soil carbon emissions. Earlier snow melt in spring promotes deeper soil warming and enhances the contribution of deeper soils to total soil respiration during the later growing season, thereby reducing net ecosystem carbon uptake. Early cold-season soil respiration is closely linked to the number of snow-free days after land surface freezes (R = −0.48, p 

scholarly journals Autotrophic and heterotrophic components of soil respiration caused by rhizosphere priming effects in a plantation

2017 ◽  
Vol 63 (No. 7) ◽  
pp. 295-299 ◽  
Author(s):  
Song Wenchen ◽  
Tong Xiaojuan ◽  
Zhang Jinsong ◽  
Meng Ping ◽  
Li Jun
Keyword(s):  
Soil Respiration ◽  
Priming Effect ◽  
Positive Impact ◽  
Soil Depth ◽  
Robinia Pseudoacacia ◽  
Heterotrophic Respiration ◽  
Autotrophic Respiration ◽  
Deep Soil ◽  
Total Soil ◽  
Total Soil Respiration

Root-exudate inputs can stimulate the decomposition of soil organic carbon by priming microbial activity, but its ecological significance is still not fully understood. This study evaluated autotrophic respiration and heterotrophic respiration driven by roots using the <sup>13</sup>C natural abundance method in a Robinia pseudoacacia plantation. The results showed that the priming effect existed in deep soil of the plantation. The proportions of autotrophic respiration and heterotrophic respiration deriving from priming effect to total soil respiration varied with soil depth. Rhizomicrobial respiration (RMR) accounted for about 15% of the total soil respiration, and the rate of priming decomposition of soil organic matter (PSOM) was only about 5% of the total soil respiration. RMR was significantly positively correlated with PSOM. Heterotrophic respiration derived by the priming effect was too weak to have a positive impact on atmospheric CO<sub>2</sub>.

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