Precipitation variability drives the reduction of total soil respiration and heterotrophic respiration in response to nitrogen addition in a temperate forest plantation

2019 ◽  
Vol 56 (2) ◽  
pp. 273-279 ◽  
Author(s):  
Huanhuan Song ◽  
Tao Yan ◽  
Jinsong Wang ◽  
Zhenzhong Sun
Keyword(s):  
Soil Respiration ◽  
Temperate Forest ◽  
Nitrogen Addition ◽  
Precipitation Variability ◽  
Heterotrophic Respiration ◽  
Forest Plantation ◽  
Total Soil ◽  
Total Soil Respiration

Autotrophic and heterotrophic respiration rates across a chronosequence of hybrid poplar plantationsin northern Alberta

2008 ◽  
Vol 88 (3) ◽  
pp. 261-272 ◽  
Author(s):  
Daniel D Saurette ◽  
Scott X Chang ◽  
Barb R Thomas
Keyword(s):  
Soil Respiration ◽  
Forest Ecosystems ◽  
Statistical Tests ◽  
Hybrid Poplar ◽  
Heterotrophic Respiration ◽  
Total Soil ◽  
Plantation Age ◽  
Average Proportion ◽  
Total Soil Respiration ◽  
Northern Alberta

Distinction of autotrophic (root, Rr) versus heterotrophic (Rh) soil respiration is important to understanding C balance in forest ecosystems and the contribution of both respiration components to total soil respiration (Rs) may change as stands mature. We studied Rr and Rh in a chronosequence of hybrid poplar plantations that were 4, 6, 8, and 13 yr old in summer 2005. We hypothesized that Rr will become increasingly larger and will also represent a greater proportion of Rs as plantation age increases. Our results showed that both Rs and Rh showed significant seasonal variations; however,Rr were much more variable. No significant differences among plantation ages were observed for any of the respiration parameters (Rr, Rh and Rs) measured throughout the summer. No significant differences were found for the contribution of Rh to Rs between plantation ages or between sampling dates. The average proportion of Rh to Rs across all sites and sampling dates was 0.63 ± 0.026 (mean ± standard error), indicating that heterotrophic respiration dominated total soil respiration in the studied hybrid poplar plantations.The power of the statistical tests in this study was likely quite low due to the inclusion of only two replicates for each plantation age. Key words: Autotrophic, heterotrophic respiration, root exclusion, trenching, hybrid poplar, chronosequence

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>.

Variability of total soil respiration in a Mediterranean vineyard

Soil Research ◽  
2015 ◽  
Vol 53 (5) ◽  
pp. 531 ◽  
Author(s):  
Egidio Lardo ◽  
Assunta Maria Palese ◽  
Vitale Nuzzo ◽  
Cristos Xiloyannis ◽  
Giuseppe Celano
Keyword(s):  
Soil Respiration ◽  
Spatial Variability ◽  
Co2 Emissions ◽  
Temporal Dynamics ◽  
Non Invasive ◽  
Total Soil ◽  
Greenhouse Gas Flux ◽  
Flux Measurements ◽  
Total Soil Respiration

Total soil respiration (TSR) is the major component of the CO2 global flux. The knowledge of the temporal-spatial variability of TSR allows for a better interpretation of a critical component of global greenhouse gas flux measurements. The objective of the research was to evaluate the TSR dynamic over a long measurement period in a vineyard in the South of Italy. A static home-made automatic system was used to measure TSR for a three year period. A portable gas analyser (Li-Cor 6400-09) was used to study TSR spatial variability. A non-invasive geophysical technique (Electromagnetic Induction – EMI) was applied to search for a significant relationship between apparent soil electrical conductivity (ECa), the EMI signal and TSR. Long-term measurements of TSR enabled to study its temporal dynamics. CO2 rates ranged from 0.78 to 43.7 g CO2 m–2 day–1. TSR increased during spring and decreased by 45–50% during the mid-summer. The daily trend of TSR showed differences between the seasons studied reporting a clearly variation among TSR measured on row and inter-row positions. The supplemental irrigation significantly affected (P < 0.001) CO2 soil effluxes which showed a weekly mean increase of 300%. Significant inverse relationships were found by interpolating TSR values and ECa (coefficient of correlation ranging from –0.43 to –0.83 at P < 0.001). The spatialisation of TSR at field scale was performed using the linear regression between TSR values and EMI signals. TSR spatialisation gave a more detailed view of CO2 emissions distribution within the vineyard. EMI technique could be a useful tool to compute accurately the global CO2 emissions which are a complex and hard to measure component of the agrosystem carbon balance.

Sign in / Sign up

Export Citation Format

Share Document