scholarly journals Elevated CO2 and Tree Species Affect Microbial  Activity and Associated Aggregate Stability in Soil  Amended with Litter

Forests ◽  
2017 ◽  
Vol 8 (3) ◽  
pp. 70 ◽  
Author(s):  
Salwan Al‐Maliki ◽  
David Jones ◽  
Douglas Godbold ◽  
Dylan Gwynn‐Jones ◽  
John Scullion
Keyword(s):  
Microbial Activity ◽  
Elevated Co2 ◽  
Tree Species ◽  
Aggregate Stability

Effects of elevated CO2 concentration and nitrogen addition on the chemical compositions, construction cost, and payback time of subtropical trees in Cd-contaminated mesocosm soil

2021 ◽  
Author(s):  
Xiaowei Zang ◽  
Xianzhen Luo ◽  
Enqing Hou ◽  
Guihua Zhang ◽  
Xiaofeng Zhang ◽  
...  
Keyword(s):  
Growth Rate ◽  
Elevated Co2 ◽  
Photosynthetic Rate ◽  
Tree Species ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
Physiological Characteristics ◽  
Chemical Compositions ◽  
N Addition ◽  
Payback Time

Abstract Rising atmospheric CO2 concentration ([CO2]) and nitrogen (N) deposition are changing plant growth, physiological characteristics, and chemical compositions; however, few studies have explored such impacts in a heavy-metal-contaminated environment. In this study, we conducted an open-top chamber experiment to explore the impacts of two years of elevated atmospheric [CO2] and N addition on the growth, physiological characteristics, and chemical compositions of five subtropical tree species in a cadmium (Cd)-contaminated environment. Results showed that N addition significantly increased concentration of leaf N and protein in five tree species, and also decreased payback time (PBT) and leaf C:N ratios and increased tree relative height growth rate (RGR-H) and basal diameter growth rate (RGR-B) in Liquidambar formosana and Syzygium hainanense. Elevated [CO2] increased leaf maximum photosynthetic rate (Amax) and concentration of total non-structural carbohydrates (TNC) and shortened PBT to offset the negative effect of Cd contamination on RGR-B in A. auriculiformis. The combined effects of elevated [CO2] and N addition did not exceed their separate effects on RGR-H and RGR-B in Castanopsis hystrix and Cinnamomum camphora. N addition significantly increased the concentration of leaf Cd by 162.1% and 338.0%, and plant Cd bio-concentration factor (BCF) by 464% and 861% in C. hystrix, and C. camphora, respectively, compared to Cd addition. Among the five tree species, the decreases in PBT and the increases in Amax, RGR-B, and concentrations of leaf protein in response to N and Cd addition under elevated [CO2] were average higher 86.7% in A. auriculiformis than other species, suggesting that the mitigation of the negative effects of Cd pollution by elevated [CO2] and N addition among five species was species-specific. Overall, we concluded that N addition and elevated [CO2] reduced Cd toxicity, and increased the growth rate in A. auriculiformis, S. hainanense and L. formosana, while maintained the growth rate in C. hystrix, and C. camphora by differently increasing photosynthetic rate, altering the leaf chemical compositions, and shortening PBT.

The temperature response of leaf dark respiration in 15 provenances of Eucalyptus grandis grown in ambient and elevated CO2

2017 ◽  
Vol 44 (11) ◽  
pp. 1075 ◽  
Author(s):  
Michael J. Aspinwall ◽  
Vinod K. Jacob ◽  
Chris J. Blackman ◽  
Renee A. Smith ◽  
Mark G. Tjoelker ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Tree Species ◽  
Unit Area ◽  
Dark Respiration ◽  
Eucalyptus Grandis ◽  
Temperature Response ◽  
Respiratory Physiology ◽  
Interactive Effects ◽  
Short Term ◽  
Leaf Dark Respiration

The effects of elevated CO2 on the short-term temperature response of leaf dark respiration (R) remain uncertain for many forest tree species. Likewise, variation in leaf R among populations within tree species and potential interactive effects of elevated CO2 are poorly understood. We addressed these uncertainties by measuring the short-term temperature response of leaf R in 15 provenances of Eucalyptus grandis W. Hill ex Maiden from contrasting thermal environments grown under ambient [CO2] (aCO2; 400 µmol mol–1) and elevated [CO2] (640 µmol mol–1; eCO2). Leaf R per unit area (Rarea) measured across a range of temperatures was higher in trees grown in eCO2 and varied up to 104% among provenances. However, eCO2 increased leaf dry mass per unit area (LMA) by 21%, and when R was expressed on a mass basis (i.e. Rmass), it did not differ between CO2 treatments. Likewise, accounting for differences in LMA among provenances, Rmass did not differ among provenances. The temperature sensitivity of R (i.e. Q10) did not differ between CO2 treatments or among provenances. We conclude that eCO2 had no direct effect on the temperature response of R in E. grandis, and respiratory physiology was similar among provenances of E. grandis regardless of home-climate temperature conditions.

scholarly journals Microbial Activity in Forest Soil Under Beech, Spruce, Douglas Fir and Fir

2016 ◽  
Vol 65 (1-2) ◽  
pp. 33-38
Author(s):  
Timea Hajnal-Jafari ◽  
Simonida Đurić ◽  
Dragana Stamenov ◽  
Verica Vasić ◽  
Davorka Hackenberger
Keyword(s):  
Forest Soil ◽  
Microbial Activity ◽  
Dehydrogenase Activity ◽  
Standard Method ◽  
Tree Species ◽  
Douglas Fir ◽  
Sampling Time ◽  
Spectrophotometric Methods ◽  
Cellulolytic Microorganisms ◽  
Number Of Bacteria

Summary The aim of this research was to investigate the microbial activity in forest soil from different sites under deciduous and coniferous trees in Serbia. One site on Stara planina was under beech trees (Fagus sp.) while another under mixture of spruce (Picea sp.) and Douglas fir (Pseudotsuga sp.). The site on Kopaonik was under mixture of beech (Fagus sp.) and spruce (Picea sp.) trees. The site on Tara was dominantly under fir (Abies sp.), beech (Fagus sp.) and spruce (Picea sp.). The total number of bacteria, the number of actinobacteria, fungi and microorganisms involved in N and C cycles were determined using standard method of agar plates. The activities of dehydrogenase and ß-glucosidase enzymes were measured by spectrophotometric methods. The microbial activity was affected by tree species and sampling time. The highest dehydrogenase activity, total number of bacteria, number of actinobacteria, aminoheterotrophs, amylolytic and cellulolytic microorganisms were determined in soil under beech trees. The highest total number of fungi and number of pectinolytic microorganisms were determined in soil under spruce and Douglas fir trees. The correlation analyses proved the existence of statistically significant interdependency among investigated parameters.

Assessing the impact of elevated CO2 on soil microbial activity in a Mediterranean model ecosystem

1995 ◽  
Vol 187 (2) ◽  
pp. 333-342 ◽  
Author(s):  
Shivcharn S. Dhillion ◽  
Jacques Roy ◽  
Mary Abrams
Keyword(s):  
Microbial Activity ◽  
Elevated Co2 ◽  
Soil Microbial Activity ◽  
Model Ecosystem ◽  
Soil Microbial ◽  
The Impact

scholarly journals Canopy height affects the allocation of photosynthetic carbon and nitrogen in two deciduous tree species under elevated CO2

2022 ◽  
Vol 268 ◽  
pp. 153584
Author(s):  
Siyeon Byeon ◽  
Wookyung Song ◽  
Minjee Park ◽  
Sukyung Kim ◽  
Seohyun Kim ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Tree Species ◽  
Canopy Height ◽  
Deciduous Tree ◽  
Carbon And Nitrogen ◽  
Photosynthetic Carbon
Sign in / Sign up

Export Citation Format

Share Document