Soil CO2 evolution in Florida slash pine plantations. II. Importance of root respiration

1987 ◽  
Vol 17 (4) ◽  
pp. 330-333 ◽  
Author(s):  
Katherine C. Ewel ◽  
Wendell P. Cropper.Jr. ◽  
Henry L. Gholz
Keyword(s):  
Fine Roots ◽  
Root Biomass ◽  
Root Respiration ◽  
Slash Pine ◽  
Co2 Evolution ◽  
Soil Co2 ◽  
Decomposition Rates ◽  
Subsequent Decomposition ◽  
Initial Root ◽  
Soil Co2 Evolution

Respiration of live roots was the single largest contributor to soil CO2 evolution in two mature slash pine (Pinuselliottii) plantations. Root respiration accounted for 51% of soil CO2 evolution at the 9-year-old plantation and 62% at the 29-year-old plantation. Additional estimates, calculated from data recorded from two small trenched plot sites at the 29-year-old plantation and based on possible variations in initial root biomass and subsequent decomposition rates, also averaged 62% of soil CO2 evolution. Specific root respiration averaged 0.40 g•g−1•year−1, varying from 0.34 to 1.70 g•g−1•year−1. Plots with larger proportions of fine roots had faster soil CO2 evolution rates.

Soil CO2 evolution: Response from arginine additions

2009 ◽  
Vol 42 (3) ◽  
pp. 324-327 ◽  
Author(s):  
R.L. Haney ◽  
A.J. Franzluebbers
Keyword(s):  
Co2 Evolution ◽  
Soil Co2 ◽  
Soil Co2 Evolution

Organic matter dynamics of fine roots in plantations of slash pine (Pinuselliottii) in north Florida

1986 ◽  
Vol 16 (3) ◽  
pp. 529-538 ◽  
Author(s):  
Henry L. Gholz ◽  
Laurel C. Hendry ◽  
Wendell P. Cropper Jr.
Keyword(s):  
Organic Matter ◽  
Boreal Forests ◽  
Fine Roots ◽  
Root Biomass ◽  
Root Diameter ◽  
Slash Pine ◽  
Root Turnover ◽  
Root Production ◽  
Seasonal Patterns ◽  
Turnover Rates

Seasonal patterns of live, dead, and unknown viability fine (diameter, ≤10 mm) roots of pine and other vegetation in a young and old slash pine stand were sampled using monthly soil coring over a 24-month period. A distinct unimodal pattern for roots <1 mm in diameter in the surface soil was observed. Live roots increased in the spring to a peak in midsummer and then declined. Larger roots and roots deeper in the soil showed less distinct seasonal patterns, although maximum and minimum annual biomass values were sometimes significantly different. Decomposition of fine roots in buried mesh bags averaged 15–20% per year for roots <5 mm in diameter. An analysis of seasonal dynamics and decompositon rates were combined to construct organic matter budgets for the forest floor and soil. Estimated net root production for roots ≤10 mm in diameter was 590 and 626 g m−2 year−1 in the young and old stand, respectively. Root turnover contributed 214 and 452 g m−2 year−1 to detrital pools on the two sites, with the balance of production accumulating as standing root biomass or lost in decomposition. Root production and turnover rates decreased with increasing root diameter; most production was from roots <1 mm. Pine root production was greater and nonpine production was less in the older stand than in the younger stand. Compared with other temperate and boreal forests, root biomass was high and net root production relatively low. The low production:biomass ratio may be characteristic of low latitude (warm) and (or) low nutrient forest types.

Insitu needle and fine root respiration in mature slash pine (Pinuselliottii) trees

1991 ◽  
Vol 21 (11) ◽  
pp. 1589-1595 ◽  
Author(s):  
Wendell P. Cropper Jr. ◽  
Henry L. Gholz
Keyword(s):  
Time Series ◽  
Fine Roots ◽  
Root Respiration ◽  
Fine Root ◽  
Time Of Day ◽  
Slash Pine ◽  
Chamber System ◽  
North Central ◽  
Central Florida ◽  
Respiration Rates

Respiration of needles and surface fine roots was measured in a north central Florida slash pine (Pinuselliottii Engelm. var. elliottii) plantation. A controlled temperature chamber system was used to estimate respiration rates and Q10 values of insitu tissues over a range of 10 to 35 °C. Respiration rates did not differ significantly among seasons, fertilized versus unfertilized plots, or time of day in a diurnal time series (needles). Needle respiration from the lower canopy was less than that from the upper canopy. Fine root respiration measurements were consistent with previously made estimates based on soil CO2 partitioning and trenched plots.

Soil CO2 evolution from Korean pine virgin forest at Changbai Mountain

1998 ◽  
Vol 9 (3) ◽  
pp. 192-194
Author(s):  
Ma Yueqiang ◽  
Yan Xiaodong ◽  
Yang Sihe
Keyword(s):  
Changbai Mountain ◽  
Co2 Evolution ◽  
Korean Pine ◽  
Soil Co2 ◽  
Virgin Forest ◽  
Soil Co2 Evolution

Effects of lanthanum on dehydrogenase activity and carbon dioxide evolution in a Haplic Acrisol

Soil Research ◽  
2003 ◽  
Vol 41 (4) ◽  
pp. 731 ◽  
Author(s):  
H. Y. Chu ◽  
J. G. Zhu ◽  
Z. B. Xie ◽  
H. Y. Zhang ◽  
Z. H. Cao ◽  
...  
Keyword(s):  
Microbial Activity ◽  
Dehydrogenase Activity ◽  
Soil Ph ◽  
Co2 Evolution ◽  
Soil Co2 ◽  
Prolonged Incubation ◽  
Maximum Decrease ◽  
Dry Soil ◽  
Soil Co2 Evolution ◽  
Soil Dehydrogenase Activity

Rare earth elements (REEs) are applied widely to increase crop production in China but less attention has been paid to the principle adverse effects of the accumulation of REEs in soils. In this paper we studied the effects of lanthanum (La) on two indicators of microbial activity: dehydrogenase activity and CO2 evolution. The soil was collected from crop land of the Chinese Academy of Sciences' Red Soil Ecological Experimental Station. Application of La decreased soil pH and there were significant negative correlations between soil pH and added La. Significant positive correlations were also observed between 0.05 M HCl extractable La and added La, indicating that exogenous La was highly available in soil. Additions of La decreased soil dehydrogenase activity and the recorded maximum decrease was 64% after 1 day of incubation with an application of 1000 mg La/kg dry soil. The inhibition of soil dehydrogenase activity by La was gradually alleviated on prolonged incubation time. Addition of La at low concentrations slightly increased soil CO2 evolution but decreased it if at greater concentrations. The recorded maximum decrease in soil CO2 evolution was 33% after 56 days of incubation with an application of 1000 mg La/kg dry soil. The results in this paper indicated that agricultural use of REEs such as La at excessive levels would produce harmful effects to soil microbial activity and microbially mediated soil function. It is likely that change in soil dehydrogenase activity can be used as a sensitive indicator in assessing the level of REEs pollution in soil.

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